Package of Practice for Cotton: Tamil Nadu State
SEASON AND VARIETIES
|Irrigated (Main) Winter Irrigated (Aug – Sep)|
Coimbatore, Erode, Madurai,
MCU 5, MCU 5 VT, Suvin, TCHB 213*, MCU 12, MCU
13, Surabhi, Sumangala, Sruthi
|Dharmapuri||MCU 5, TCHB 213*, MCU 12, MCU 13, Suvin|
MCU 5, Suvin, TCHB 213*, MCU 12, MCU 13,
MCU 5, MCU 12, MCU13, LRA 5166, TCHB 213*,
SVPR 2, Surabhi
|Summer – Irrigated (Feb – Mar)|
MCU 5, MCU 5 VT, SVPR 2, Supriya, MCU 12, MCU
13, TCHB 213
|Madurai, Dindigul, Theni||
MCU 5, MCU 5 VT, MCU 12, MCU 13, SVPR 2,
Srivagangai, Tirunelveli, Thoothukudi
|MCU 5, MCU 5 VT, SVPR 2, MCU 12, MCU 13|
|Rainfed (Sep – Oct)|
|Madurai, Dindigual, Theni||LRA 5166, K 11, KC 2, SVPR 2|
|LRA 5166, K 11, KC 2, SVPR 2|
|Tirunelveli, Thoothukudi, Dharmapuri||LRA 5166, K 11, KC 2, SVPR 2|
Thanjavur, Tiruvarur, Nagapattinam,
Parts of Trichirapalli, Perambalur,
Karur, Cuddalore and Villupuram
|MCU 7, SVPR 3, Anjali|
PARTICULARS OF COTTON VARIETIES/HYBRIDS
|MCU 5||Mutiple cross||
Extra long staple (29 mm
MHL), Can spun upto 70s,
X ray irradiation
of X L 1143 EE
Medium staple (23.7 mm
MHL), MHL), Can spun upto 30s,
early maturing with 33.2%
ginning outturn. Tolerant
to Balck arm
the cross LRA
5166 x MCU 11
Shorter in duration than
MCU 5, GOT 34.8% Can
spun upto 50s
It is a multiple
parents of [(TCH
665 x LS 149) x
Early duration Can spun
(TCH 665 x TCH
21)] x (TCH 21 x
EECH) x (TCH 92-
7 x EECH)
Laxmi x Reba
B.50 x AC 122
Medium staple (29 mm),
Can spun upto 40s,
|MCU 5 VT||
Extra long staple
Verticillium wilt tolerant
MCU 5 x C 1998
|Irrigated||2000||White fly tolerant|
LRA 5166 x
(Khandwa 2 x
Reba B 50) BC 2
Dwarf, semi compact
MCU 5 VT (MCU
Extra long staple
Verticillium wilt resistant
CW 134 x Reba B
50 x Khandwa 2
|Suitable for rainfed tract|
|Sruthi||70 E x RSP 4||Sept-Oct||Rainfed||2500||Early duration|
876) x (0794-1-DX
H 450) Multiple
|Sept-Oct||Rainfed||1100||Better fibre propertieswith lesser pest incidencethan K 10|
from the cross
Sujatha x St.
Extra long staple cottonwith 28% ginning outturnand 32 mm MHL, spins
Hybrid of TCH
|Aug-Sep||Irrigated||2215||High yielding, earlymaturing, Tolerant to leafspot diseases|
|SVPR 2||TSDT 22 x JR 36||
High ginning out turn of36.4%, medium staple(24.3 mm), can spin 30’s,suited
irrigated, winter rainfed
and tankfed rice fallow
tracts of Tamil Nadu
L.H 900 x 1301
Suitable for rice fallow
tract. Early duration (135-
140 days). Tolerant to
alternaria spot, black arm
|KC 2||MCU 10 x KC 1||Sep-Oct||Rainfed||1000||
High ginning out turn of
37.5% medium staple
cotton – 24.4 mm, Suited
for rainfed black cotton
soil of Tirunelveli,
PREPARATION OF FIELD FOR IRRIGATED COTTON CROP
PREPARATION OF THE FIELD
- Prepare the field to get a fine tilth.
- Chiselling for soils with hard pen: Chiset the soils having hard pen formation at shallow depths with chisel plough at 0.5 M interval, first in one direction and then in the direction perpendicular to the previous one, once in three years. Apply 12.5 farm yard manure or composted coir pith/ha besides chiseling to get increased yield
- If intercropping of Greengram/Soyabean is proposed, prepare the main field, so as to provide ridges and furrows to take up sowing 20 days prior to cotton sowing.
APPLICATION OF FYM OR COMPOST
Spread 12.5 t of FYM or compost or 2.5 t of vermicompost per ha if available, uniformly on the unploughed soil.
APPLICATION OF BIOFERTTLIZER
Seed treatment with 3 packets of Azospirillum (600 g/ha) and 3 packets (600 g/ha) of Phosphobacteria or 6 packets of Azophost(1200 g/ha). In addition apply and 10 packets of Azospirillum (2000 g/ha) and 10 packets (2000 g/ha) of Phosphobacteria or 20 packets of Azophos (4000 g/ha) mixed with 25 kg FYM and 25 kg of soil on the seed line. This save 25% nitrogen besides increasing yield.
FORMATION OF RIDGES AND FURROWS
- Form ridges and furrows 10 m long with appropriate spacing depending upon the variety.
- Use ridge plough or bund former to form ridges so as to economic on cost of cultivation.
- In fields with ragi stubbles, just dibble cotton seeds at the specified spacings.
- Adopt the following spacing between ridges for different varieties/hybrids.
|Varieties/Hybrids||Spacing between ridges(cm)|
|MCU 5, SVPR 2, LRA 5166, MCU 12, MCU 13||75|
APPLICATION OF INORGANIC FERTILIZERS
- Apply NPK fertilizers as per soil test recommendations
- If soil test recommendations are not available follow the blanket recommendation for the different varieties.
|Varieties/Hybrids||Quantity of fertilizers|
|MCU 7, SVPR 3||60||30||30|
|MCU 5, MCU 5 VT, MCU 12, MCU 13, Suvin, SVPR 2||80||40||40|
- If basal application could not be done apply the 25th day after sowing.
- Apply 50 per cent of N and K full dose of P2O5 as basal and remaining ?N and K at 40 – 45 DAS for varieties. For hybrids apply N in three splits viz., basal, 45 and 65 DAS
- Foliar application of 2% DAP + 1% KCI will improve kapas yield.
- Apply the fertilizers in a band, two thirds of the distance from the top of the ridge, and incorporate.
APPLICATION OF MICRONUTRIENT MIXTURE
Mix 12.5 kg of micronutrient mixture formulated by the Department of Agriculture. Tamil Nadu with enough sand to make a total quantity of 50 kg for one ha.
NUTRITIONAL DISORDERS’ CORRECTION
- In the cross of Zinc deficient soils ZnSO4 @ 50 kg/ha as basal or ZnSO4 0.5% spray thrice at 45, 60 and 75 DAS.
- When reddening occurs in leaves apply 5% MgSO4 Urea(1.0%) and ZnSO4 (0.10%) as foliar spray on 50th and 80th day to correct this malady. In Mg deficient areas apply MgSO4 @ 20 kg/ha basally.
MANAGEMENT OF MAIN FIELD OPERATIONS
Adopt the following seed rates for different varieties/hybrids
|Varieties/Hybrids||Quantity of seed (Kg/ha)|
|MCU 5, MCU 5 VT, MCU 7, MCU 12, MCU 13||15.00||7.50||---|
In a pure crop of cotton, adopt the spacing as below for the different varieties.
|Between rows||Between plants|
|MCU 5, MCU 5 VT, MCU 12, MCU 13||75||30|
|LRA 5166, SVPR 2|
|MCU 7, SVPR 3||60 or 75*||30|
* Fertile soils
a. If cotton intercropped with other crops, one paired row of cotton is alternated with three rows of intercrop and the total population of cotton crop is maintained at the same level as in the case of pure crop.
b. For intercropping with Greengram/ Soyabean, complete the sowing and irrigation 20 days prior to cotton sowing on one side of the ridge.
|Varieties/Hybrids||Spacing for cotton crop (cm)|
|MCU 5, MCU 5 VT, MCU 12, MCU 13||60||90||30|
Plant two rows of intercrop between each paired row of cotton
|Intercrop||Seed rate (kg/ha)||Spacing (cm)|
For higher returns, advance sowing of either greengram or soyabean 20 days before sowing of cotton in winter season.
ACID – DELINTING OF COTTON SEEDS
- Choose plastic bucket for acid delinting of seeds.
- Do not use earthen wares, metal vessels, porcelain wares or wooden drum for acid delinting as concentrated sulphuric acid will corrode them.
- Put the required quantity of seeds in the container and add commercial concentrated sulphuric acid at the rate of 100 ml per kg of fuzzy seed.
- Stir vigorously and continuously with a wooden stick for 2 to 3 minutes till the fuzz sticking to the seeds is completely digested and the seed coat attains a dark brown colour of coffee powder.
- Add water to fill the container. Drain the acid water and repeat the washing 4 or 5 times to remove any trace of acid.
- Remove the floating, ill-filled and damaged seeds while retaining the healthy and good seeds which remain at the bottom.
- Drain the water completely and dry the delinted seeds in shade.
NOTE: Acid delinting has the following advantages:
- Eliminate some externally seed borne pathogenic organisms.
- Kills eggs, larvae and pupae of pink boll worm
- Helps to remove immature, ill-filled, cut and damaged seeds.
- Makes seed dressing more effective and easy.
- Facilitates easy sowing and good germination.
PRE-TREATMENT OF ACID DELINTED SEEDS WITH FUNGICIDES
- Treat the delinted seeds with talc formulation of Trichoderma viride @ 4g/kg of seed or with Carbendazim (or) Thiram @ 2g/kg of seed Biocontrol agents are compatible with biofertilizers. First treat the seeds with biocontrol agents and then with biofertilizers. Fungicides and biocontrol agents are incompatible.
- Treat the delinted fungicide treated seeds with 3 packets (600 g) of Azospirillum and 3 packets of phosphobacteria 600g (or) 6 pakets of Azophos (1200 g) and sow immediately.
Seed pelleting: Seeds coated with arappu leaf powder (100 g/kg) along with DAP (40 g/kg), micronutrient mixture (15 g/kg) and Azospirillum (200 g/kg) phosphobacteria (200 g/ha) or Azophos (400 g/ha) using 5% maida solution or gruel as adhesive (300 m/kg) to increase the germination and vigour.
- Dibble the seeds at a depth of 3-5 cm on the side of the ridge 2/3 height from the top and above the band where fertilizers and insecticides are applied, maintaining the correct spacing and then cover seeds with soil.
- In the case of intercropping, sow the seeds of the intercrop in between the paired rows of cotton in a row of 5 cm apart and cover the seeds.
- Sow the required number of seeds in each hole.
|Varieties/hybrids||No.of seeds / hole|
|Fuzzy seeds||Delinted seeds|
- Apply Pendimethalin @ 3.3 l/ha three days sowing using a hand operated sprayer fitted with deflecting or fan type nozzle. Sufficient moisture should be present in the soil at the time of herbicide application. This will ensure weed free condition upto 40 days.
- One hand weeding on 45 DAS will keep weed free environment upto 60 DAS.
- Hoe and hand weed between 18th to 20th day of sowing, if herbicide is not applied at the time of sowing.
- In the case of TCHB 213, raise seedlings in polythene bags of size 15 x 10 cm.
- Fill the polythene bags with a mixture of FYM and soil in the ratio 1:3.
- Dibble one seed per bag on the same day when sowing is taken up in the field.
- Pot water and maintain.
- On the 10th day of sowing, plant seedlings maintained in the polythene bags, one in each of the gaps in the field by cutting open the polythene bag and planting the seedling along with the soil intact and then pot water.
- Top dress 50% of the recommended dose of N and K on 40 – 45 DAS for varieties.
- Top dress 1/3rd of recommended dose of N on 40 – 45 DAS and the remaining 1/3rd on 60 – 65th DAS for hybrids.
RECTIFICATION OF RIDGES AND FURROWS
SPRAYING OF NAPTHALENE ACETIC ACID (NAA)
MANAGEMENT STRATEGIES FOR DELAYED UMMER IRRIGATED COTTON SOWING
ARRESTING TERMINAL GROWTH:
|Stages||No. of Irrigations||Days after dibbling seeds|
|Light soil||Heavy soil|
|Germination Phase (1 – 15 days)|
|1||Immediately after sowing||Immediately after sowing|
|Establishment||2||Give a life irrigation on||Give a life irrigation on|
|5th day of sowing to||5th day of sowing to|
|facilitate the seedlings||facilitate the seedlings|
|to emerge out||to emerge out|
|Vegetative phase (16 – 44 days)|
|Regulate||1||Irrigate on the 20th or||Irrigate on the 20th or|
|21st day of sowing three||21st day of sowing three|
|Days after hoeing and||Days after hoeing and|
|2||Irrigate again on||Irrigate again on|
|the 35th or 36th||the 40th day of|
|day of sowing||Sowing|
|Flowering phase (45 – 100 days for hybrids and 87 days for varieties)|
|Irrigate copiously||1||48th day||55th day|
|2||60th day||70th day|
|3||72nd day||85th day|
|4||84th day||100th day|
** For TCHB 213 and Suvin only.
(beyond 100 days
for hybrids and 88
days for varieties)
|For all varieties other than Suvin, and TCHB 213|
|Control irrigation||1||108th day||115th day|
|during maturity||2||120th day||130th day|
|Stop Irrigation after 150th day|
|For Suvin, TCHB 213|
|1||108th day||115th day|
|2||120th day||130th day|
|3||132nd day||145th day|
|4||144th day||150th day|
|Stop Irrigation after 160th day|
If irrigation is given on climatological approach. Schedule the
irrigation at 0.40 and 0.60 IW/CPE ratio during vegetative and
reproductive phases respectively.
Depending upon the prevailing weather condition and receipt of
Adopt alternate furrow or skip furrow irrigation to save irrigation
Skip furrow irrigation
- Suited to heavy soils like clay and loam
- Alternate furrows should be skipped and may be converted to ridges having a wide bed formation
- Short term crops like pulses may be raised in wider bed without exclusive irrigation.
- Water saving is 50% when compared to control.
Alternate furrow irrigation
- During any one run of irrigation a particular set of alternate furrows is irrigated.
- The interval of irrigation should be shortened when compared to the conventional furrows.
- During the next run, the left over furrows be irrigated.
- Suited to heavy soils like clay and loam.
- Harvest at frequent intervals, at less than 7 days interval.
- Harvest in the morning hours upto 10 to 11 a.m only when there is moisture so that dry leaves and bracts do not stick to the kapas and lower than market value.
- Pick kapas from well burst boll only.
- Remove only the kapas from the bolls and leaves the bracts on the plants.
- After kapas is picked, sort out good puffy ones and keep separately.
- Keep stained, discoloured and insect damaged kapas with good kapas, as they will
POST HARVEST OPERATIONS
- Immediately after picking, dry the kapas in shade. If it is not dried immediately the colour will change which will lower than market value.
- Do not dry the kapas under direct sun as the fibre strength and luster will be lost.
- Grade the kapas into good and second quality ones, if it is not sorted out at the time of picking.
- Spread a thin layer of dry sand on the ground and keep the kapas over it.
RICE FALLOW COTTON - MANAGEMENT OF FILED OPERATIONS
PREPARATION OF THE FIELD
- If the seed is in waxy condition, instead of Zero tillage, the seed rows may be tilled and the seed dibbled in Virudhunagar district.
- If the soil is dry and not in condition to take up sowing, let in water and then allow the soil to dry till soil comes to waxy condition.
- At the lower level of the field dig a trench 15 cm wide and connect the trench to the outside channel to dram off the excess water.
PRE – TREATMENT OF ACID DELINTED SEEDS WITH FUNGICIDES
- Same as for the irrigated crop.
- Treat the acid delinted and fungicide treated seeds with 3 packets (600 g) of Azosprillum and sow immediately.
SOWING THE SEEDS
|a) Seed rate (kg/ha)||MCU 7||SVPR 3|
|b) Spacing (cm)|
|?Between rows||60||60 or 75*|
|c) Number of seeds / hole|
|d) Depth of sowing (cm)||3||3|
FILLING UP GAS
- Fill up gaps on the 10th day of sowing
- Dibble 2 to 3 acid delinted seeds or 4 to 5 fuzzy seeds in the gaps in the case of MCU 7 and SVPR 3
- Thin out seedlings on the 20th day of sowing
- Leave only one healthy and vigorous seedling per hill.
- Pre-emergence application of Pendimethalin 3.3 l/ha ensures weed free condition for 40 – 45 days. This should be followed by one hand weeding and earthing up during 40 – 45 days.
- Take up hoeing and weeding 20 days after sowing.
- Take up this operation when the top soil dries up comes to proper condition.
APPLICATION OF FERTILIZERS
- Apply NPK fertilizers as per soil test recommendations. If soil test is not done follow the blanket recommendation of 60:30:30 kg NPK/ha.
- Apply half the dose of N and K full dose of P2O5 at 35th day in old delta and balance in 55 days the rows of cotton plants. In the case New delta apply full P and 1/3 of N and K at 20 DAS and 2/3 N and K at 40 DAS.
APPLICATION OF MICRONUTRIENTS
Apply basally 12.5 kg/ha micronutrient mixture prepared by Department of Agriculture. Apply MgSO4 basally @ 20 kg/ha to prevent reddening.
FORMATION OF RIDGES
- If soil in condition give a hoeing with mammutti and form ridges and incorporate the fertilizer in the soil around the plants between 30th to 35th day of sowing.
- If soil is not in condition, give one hoeing and weeding and cover the fertilizers.
- Form long ridges and furrows from one end of the field to the other without forming any separate channels for carrying water to prevent excessive soaking of water.
- Form ridges and furrows on alternate rows of plants. Skip furrow method of irrigation to prevent excessive irrigation.
- Give a hoeing with mummutti and form ridges and incorporate the fertilizer in the soil around the plants on the 40th day of sowing.
- If soil is not in condition give one hoeing and weeding and cover the fertilizers.
- Form long ridges & furrows on alternate rows of plants to adopt skip furrow irrigation.
Note: In case of Zinc deficient soils, apply 50 kg ZnSO4 /ha
APPLYING OF NAA
Spray 40 ppm of NAA (40 mg of NAA dissolved in one litre of water) at 40/45th day using high volume spray. Repeat the same dose after 15 days of first spraying.
Arrest terminal growth by nipping the terminal 15th node for controlling excessive vegetative growth (70 – 75 DAS)
|Days after dibbling seeds|
|Old delta||New delta|
|1. Vegetative Phase|
|Regulate irrigation||1||One wetting on the||One irrigation on the 20th day|
|during the||30th to 35th day of sowing||after the application of|
after the application of
|2||------||One irrigation on the 40th day|
|after the application of N|
|2. Flowering Phase|
|Irrigate more||1||45th day of sowing after the||45th day|
|frequently||application of 2nd dose of N|
|2||55th day||51st day|
|3||65th day||56th day|
|4||75th day||61st day|
|5||85th day||66th day|
|3. Control Irrigation||1||99th day||98th day|
|during maturity||2||113th day||105th day|
Stop irrigation from the 113th day onwards.
Note: 1) The irrigation schedule given above is only a guideline and regulates irrigation
depending upon the prevailing weather conditions and receipt of rains.
2) Observe the crop and if the plants show wilting symptoms in the afternoon and in the evening hours, give an additional irrigation.
POST HARVESTING OPERATION | As that of the irrigated cotton.
PEST AND DISEASE MANAGEMENT |
Follow water harvesting techniques and raise a successful crop of cotton.
SEASON AND VARIETIES
For Thirumangalam in Madurai district, Sattur in Virudhunagar district and parts of Kovillipatti in Thoothukudi district, where the seasonal rainfall is 375 mm and most of it is received during September of first week of October, select LRA 5166 (or) SVPR 2 (or) KC 2.
In places where rains are received during October or November. Select K 11 for Ramanathapuram, Virudhunagar, Tirunelveli and Thoothukkudi districts.
PREPARTION OF LAND FOR RAINFED COTTON
PREPARATION OF FIELD
- Start preparation of the land immediately after harvest of the previous crop.
- Adopt permanent broad ridges system.
APPLICATION OF FYM OR COMPOST
- Spread 12.5 t of FYM or compost or composted coir pith or 2.5t of vermicompost per ha uniformly on the unploughed soil.
- Incorparate the manure in the soil by working the multipurpose implement or country plough.
APPLICATION OF INORGANIC FERTILIZERS
- Apply NPK fertilizers as per soil test recommendations as far as possible.
- If soil tests are not done, follow the blanket recommendations for the different varieties.
|Varieties||Quantity of fertilizers (Kg/ha)|
APPLICATION OF MICRONUTRIENT MIXTURE
- Mix 12.5 kg of micronutrient mixture formulated by the Department of Agriculture. Tamil Nadu with enough sand to make a total quantity of 50 kg.
- Apply uniformly over the furrows after sowing and cover the seeds
- Do not incorporate in the soil.
SEEDS AND SOWING
- Adopt the following seed rates for different varieties/hybrids
|Varieties||Quantity of seeds (kg/ha)|
|Fuzzy seeds||Delinted seeds|
|LRA 5166, SVPR 2||20||15|
Note: Delint only LRA 5166 and SVPR 2 seeds. Do not delint seed of K 9, K10 & K 11
- In the case of mixed crop of cotton, maintaining the same seed rates as for a pure crop and adopt the following seed rate for the pulses crop
|Blackgram / greengram||10 kg/ha|
- In the case of pure crop of varieties/hybrids, a spacing of 45 cm between rows and 15 cm between plants may be adopted
- In the case of cotton, intercropped with pulses, one paired row of cotton is alternated with tow rows of pulses and the total population of cotton is maintained at the same line as that for a pure crop of cotton.
|Varieties||Spacing for cotton crop (cm)|
|Within Paired row||
|K 11, LRA 5166, SVPR 2||30||60||15|
- Adopt a spacing of 30 x 10 cm for the pulse crop in between each paired row of cotton. APK 1 Blackgram is best suited for this situation.
- Adopt procedure for acid delinting as for an irrigated crop
PRETREATEMENT OF ACID DELINTED SEEDS WITH FUNGCIDIES
Same as for the irrigated crop
- Use the multipurpose farming implement to sow the seeds and to apply basat fertilizers simultaneously.
- Fill the hopper in the implement with the fertilizer mixtures and work the implement.
- Engage 3 persons for dropping the seeds, 2 for cotton and one for pulses. In one operation, placement of fertilizer, sowing of seeds and covering will be completed.
NOTE: Cotton and pulses can be sown at a depth of 5 cm in black cotton soil even before the onset of monsoon rains in dry bed sowing. When light rains are received, the moisture will not penetrate deeper and the seeds will not germinate and die away. Only when good rains are received, the moisture level will be sufficient to penetrate to the level of the seed and facilitate germination and proper establishment.
- Pre-emergence application of Pendimethalin 3.3 l/ha followed by one hand weeding on 40 days after crop emergence. At the time of herbicide application sufficient soil moisture must be there.
- Insufficient soil moisture is not available for applying herbicides hand weeding may be given at 10 – 20 days after crop emergence.
- Dibble 3 to 4 seeds gap if sufficient moisture is available.
- Allow two seedlings per hole and thin out on 15th day of sowing, adopting proper spacing between plants.
- Thin the pulse crop on the 20th day of sowing, adopting a spacing of 15 cm between plants for cowpers and 10 cm for other pulse crop.
Spray 0.5% urea and 1% KCI on the 45th and 65th day of sowing if sufficient moisture is available.
INTERCULTIVATION WITH DHANTHULU/BLADE HARROW
Work dhanthulu or blade harrow on the 30th and 45th day of sowing. NOTE: Other cultivation practices, plant protection measures, harvest etc., are the same as for the irrigated crop.
- Remove the cotton crop dispose off the crop residues as soon as harvest is over
- Avoid stacking of stalks in the field
- Avoid ratoon and double cotton crop
- Adopt proper crop rotation
- Use optimum irrigation and fertilizers
- Grow one variety throughout the village as far as possible
- Treat the seeds with imidacloprid or use designer seed (Delinted seed + polykote @ 3 g/kg + carbendazim @ 2 g/kg + imidacloprid @ 7 g/kg + Pseudomonas fluorescens 10 g/kg + Azophos 40 g/kg. When the treated seeds are used, it protects against sucking pests upto 45 days after sowing and promotes early vigour of the crop.
- Synchronise the sowing time in the villages and complete the sowing within 10 to 15 days.
- Avoid other Malvaceous crops in the vicinity of cotton crop
- Timely earthing up and other agronomic practices should be done.
- Hand pick and burn periodically egg masses, visible larvae, affected and dropped squares, flowers and fruits and squash pink bollworm in the rosettes.
- Use locally fabricated light traps (modified Robinson type) with 125 Watt mercury lamps to determine the prevalence and insect population fluctuations.
- The magnitude of the activity of the moths of the cotton pink bolloworm, the cutworm (Spodoptera litura) and the American bollworm can be assessed by setting up the species-specific sex pheromone trap each all the rate of 12 per ha.
- Apply insecticides only where it is absolutely necessary when pest population or damage reaches ET level.
- Intercropping with pulses viz., cowpea, greengram, balckgram, soybean and maize reduces the bollworm incidence and population of sucking pests of cotton viz., aphid and leafhopper with the highest activity of natural enemies viz., spiders and predatory lady bird beetles.
Economic threshold level for important pests
|Thrips||50 nymphs or adults / 50 leaves|
|Aphids||15% of infested plant|
|Leafhopper||50 nymphs or adults / 50 leaves|
|Mite||10 mites / cm2 leaf area|
|Spotted Boll-worms||10% infested shoots / squares / bolls|
|Spiny Boll-worms||10% infested shoots / squares / bolls|
|Pink Boll-worms||10% infested fruiting parts|
|Helicoverpa||One egg or one larva / plant|
|Whiteflies||5 – 10 leaf|
|Stem weevil||10% infestation|
|Tobacco cutworm||8 egg masses / 100 m row|
|Helicoverpa armigera||Pest monitoring through light traps, pheromone traps and in situ assessments by roving and fixed plot surveys has to be intensified at farm, village block, regional and State levels. For management an action threshold of one egg per plant or 1 larva / plant may be adopted|
|1. Synchronised sowing of cotton preferably with short duration varieties in each cotton ecosystem.|
|2. Avoid continuous cropping of cotton both during winter and summer seasons in the same area as well as rationing.|
|3. Avoid monocropping. Growing of less preferred crops like greengram, balckgram, soybean, castor, sorghum etc., along with the cotton as intercrop or border crop or alternate crop to reduce the pest infestation.|
|4. Remove and destruction of crop residues to avoid carry over of the pest to the next season, and avoiding extended period of crop growth by continuous irrigation.|
|5. Optimising the use of nitrogenous fertilizers which will not favour the multiplication of the pest.|
|6. Judicious water management for the crop to prevent excessive vegetative growth and larval harbourage.|
|1. Application of Nuclear Polyhedrosis Virus (NPV) at 3 x 1012. POB /ha in evening hours at 7th and 12th week after sowing|
|2. Conservation and augmentation of natural predators and parasitoids for effective control of the pest.|
|3. Inundative release of egg parasitoid, Trichogramma spp., at 6.25 cc/ha at 15 days interval 3 times from 45 DAS|
|4. Egg larval parasitoid. Chelonus blackburnii and|
|5. Predator Chrysoperia carnea at 1,00,000/ha at 6th, 13th and 14th week after sowing.|
|6.ULV spray of NPV at 3 x 1012 POB/ha with 10% cotton seed kernel extract, 10% crude sugar, 0.1% each of Tinopal and Teepol for effective control of Helicoverpa. Note: Dicofol, endosulfan, methyl demeton, monocrotophos and phosalone are comparatively safer to Chrysoperia larva recording low egg mortality.|
|1. Discourage the indiscriminate use of insecticides, particularly synthetic pyrethroids|
|2. Use of proper insecticides which are comparatively safer to natural enemies such as endosulfan, phosalone etc., at the correct dosage and alternating different groups of insecticides for each round of spray.|
|3. Avoid combination of insecticides as tank mix.|
|4. Adopt proper delivery system using spraying equipments like hand compression sprayer, knapsack sprayer and mist blower to ensure proper coverage with required quantity of spray fluid and avoid ULV applications or Akela spray applications.|
|5. Proper mixing and preparation of spray formation apply endosulfan 35 EC s l/ha|
6. During bolling and maturation stage, apply any one of the following insecticide
(1000 | of spray fluid/ha);
Phosalone 35 EC 2.5 l/ha
Quinalphos 25 EC 2.0 l/ha
Carbaryl 50 WP 2.5 kg/ha
Pyraclofos 50 EC 1.5 l/ha
|Pink bollworm||1. Use pheromone trap to monitor the adult moth activity|
|Pectinophora gossypiella||2. Spray triazophos 40 EC 2.5 l/ha and endouslfan 35 EC 2.0 l/ha in alternation even after 100 DAS.|
|1. Use of light trap to monitor and kill the attracted adult moths. Set up the sex pheromone trap Pherodin S.L. at 12/ha to monitor the activity of the pest and to synchronise the pesticide application. If need be, at the maximum activity stage.|
|2. Growing castor along border and irrigation bunds.|
|3. Removal and destruction of early stage larvae found in clusters which can be located easily even from a distance.|
|4. Collection and destruction of shed materials.|
|5. Hand picking and destruction of growth up caterpillars.|
6. Spray any one of the following insecticides per ha using a high volume sprayer
covering the foliage and soil surface:
Chlorpyriphos 20 EC 2.0 l
Dichlorvos 76 WSC 1.0 l
Phenthoate 50 EC 2.0 l
Chlorpyriphos 20 EC 1.25 l
Fenitrothion 50 EC 6.25 l
|7. Spraying nuclear polyhedrosis virus at 1.5 x 1012 POB per ha.|
|8. Spraying of insecticides should be done either in the early morning or in the evening and virus in the evening|
|9. Use of poison bait pellets prepared with rice bran 12.5 kg, jaggery 1.25 kg, carbaryl 50% WP 1.25 kg and water 7.5 litres. This bait can be spread in the fields in the evening hours so that the caterpillars coming out of the soil, feed and get killed.|
|1. Soil application of carbofuran 3 G 30 kg/ha on 20 days after sowing and earthing up on 45th day.|
|2. Basal application of FYM 25 t/ha and 250 kg/ha of neem cake.|
|1. Avoid the alternate, cultivated host crops of the whitefly in the vicinity of cotton crop|
|2. Growing cotton crop once a year either in winter or summer season in any cotton tract.|
|3. Adopting crop rotation with non-preferred hosts such as sorghum, ragi, maize etc. for the white fly to check the build up of the pest.|
|4. Removal and destruction of alternate weed hosts like Abutilon indicum, Chrozophore rottlari, Solanum nigrum and Hibiscus ficulensus from the fields and neighbouring areas and maintaining field sanitation.|
|5. Timely sowing with recommended spacing, preferably wider spacing and judicious application of recommended dose of fertilizers, particularly nitrogenous and irrigation management is essential to arrest the excessive vegetative growth and pest build up. Late sowing may be avoided and the crop growth should not be extended beyond its normal duration.|
|6. Field sanitation may be given proper attention.|
|7. Cultivars of most preferred alternate host crops like brinjal, bhendi, tomato, tobacco and sunflower may be avoided. In case their cultivation is unavoidable, plant protection measures should be extended to these crops also.|
|8. Monitoring the activities of the adult white files by setting up yellow pan traps and sticky traps at 1 foot height above the plant canopy and also in situ counts|
|9. Collection and removal of whitefly infested leaves from the plants and those which were shed due to the attack of the pest and destroying them|
|1.Spray any one of the following plant products along or in combination with the recommended dose of insecticide (at 2 ml/l or water)|
Neem seed kernel extract 5% (50 kg) and neem oil at 5 ml/l
Fish oil rosin soap 25 kg at 1 kg in 40 lit of water
Notchi leaves 5% extract
Catharanthus rosea extract 5%
2.Spray any one of the following in early stage (500 l of spray fluid/ha)
Methyl demeton 25 EC 500 ml
Phosphamidon 40 SL 600 ml/ha
3.Spray any one of the following in mid and late stages (1000 l spray liquid /ha)
Phosalone 35 EC at 2.5 l/ha
Quinalphos 25 EC at 2.0 l/ha
Ethion 50 EC 1.0 l/ha
Monocrotophos 36 SL 1.25 l/ha
Triazophos 40 EC 2.0 l/ha
Acephate 75 SP 1.30 kg/ha
|4. In the early stages with high volume sprayer, use a goose neck nozzle to cover the under surface of the foliage to get good control of the pest. If high volume sprayers are not available, 375 litres of spray fluid may be used per hectare for application in the low volume motorized knapsack mist blower.|
|5. The use of synthetic pyrethroids should be discouraged in cotton to avoid the problem of whitefly. Cypermethrin, fenvalerte and delamethrin cause resurgence of whiteflies. So avoid repeated spraying of pyrethroids.|
|6. The plant protection measures should be adopted on a community basis in a specified cotton area.|
|1. Seed treatment with imidacloprid 70 WS at 7 g/kg protect the crop from aphids, leafhoppers and thrips upto 8 weeks.|
|2. Where the leafhopper is a big menace apply Neem oil formulation 0.5% or neem oil 3% thrice a fortnightly intervals|
Red spider mite
|Apply any one of the following; Wettable sulphur 1.25 kg/ha Dicofol 1.10 l/ha|
In case of control failures monitor the insecticides with following discriminating dose screen.
A. Helicoverpa armigera
(Topical assay with III instar larva weighing 30 – 40 mg)
B. Tobacco caterpillar – Spodoptera litura
(early III instar 8 day old larva weighing 30 – 40 mg and measuring 12 + 0.5 mm length)
|1. Endosulfan topical||2.0|
|2. Profenofos topical||3.0|
|3. Chlorpyriphos topical||0.15|
|4. Fenvalerate topical||0.2|
C. Cotton leafhopper – Amrasca devastans (Distant)
(III instar larva of 0.14 mg weight, 1.30 mm length)
|1. Dimethoate||IRAC method VIII (leaf disc) 400 ppm||400 ppm|
|2. Methyl demeton||IRAC method VIII (leaf disc) 800 ppm||800 ppm|
|3. Acephate||IRAC method||850 ppm|
Repeated application of the following insecticides can cause resurgence of the insect pest of cotton
- Aphis gossypii : Carbaryl, cypermethrin, deltamethrin, endosulfan, fenpropathrin, fenvaerate, flucythrinate, fluvalinate, monocrotophos, permethrin, phorate
- Amrasca devastans: Deltamethrin, dimethote, disulfoton, methylparathion, phorate
- Bemisia tabaci: Cypermethrin, deltamethrin, dimethoate, endosulfan, fenvalerate, monodrotophos, phosalone
- Ferrisia virgata: Cypermethrin, deltamethrin, fenvalerate, permethrin
- Tetranychus cinnabarinus: Acephate, carbaryl, cypermethrin, deltamethrin, endosulfan, fenvalerate, fluvalinate, phosphamidon.
- The control measures recommended for irrigated cotton will hold good.
- When water is not available, use any one of the following insecticides for the control of bollworms at 25 kg/ha:
Carbaryl 5 D
Phosalone 4 D
|Name of the Disease||Management|
Xanthomonas axonopodis pv.
|1. Avoid stacking of infected plants|
|2. Spray Streptomycin sulphate + Tetracycline mixture 100g + Copper oxychloride 1250 g/ha|
|3. Repeat spraying at 10 days interval twice or thrice if drizzling continues.|
|Spray any one of the following:|
|1. Copper Oxychloride 1250g|
|2. Mancozeb 1000g|
|3. Chlorothalonil 5000 g/ha|
|Spray Carbendazum 250 g/ha|
Aspergillus flavus, A. niger,
|Spray any one of the following|
|1. Spray Carbendazim 500 g.|
|2. Mancozeb 2000 g.|
|3. Copper oxychlotide 2500 g/ha along with an insecticide recommended for bollworm from 45th day at fortnightly interval.|
Apply Neem cake @ 150 kg/ha to the soil and treat
the seeds with talc based T viride @ 4 g/kg to reduce
the root rot incidence.
Seed treatment with T. viride @ 4 g/kg followed by
basal application of zinc sulphate @ 50 kg/ha
Spot drench Carbendazim @ 1 g/lit at the base of
affected plants as well as surrounding healthy plants.
Source: Tamil Nadu Agricultural University
Information Compiled and page designed by M. Sabesh, CICR.