1

Fruit and Boll Feeders

American boll worm (Helicoverpa armigera )

Identification & Monitoring

This is a major pest

The pest is active from July-October and February-April.

The adult moth is stout, yellowish brown with a dark speck

area on the forewings, which have grayish wavy lines and

a black kidney shaped mark whereas the hind wings are

whitish with blackish patch along the outer margin.

The larvae are about 35 mm long, greenish brown with

dark gray yellow stripes along the sides of the body.

For 65-100 days old crop, one egg or larvae per plant or 5-10 % infested fruiting bodies

is the ETL

Damage

The larvae feed on the leaves initially and then bore in to the square/bolls and seeds

with its head thrust into the boll, leaving the rest of the body outside.

A single larva can damage 30-40 bolls.

The entry holes are large and circular at the base of the boll.

Cultural Control

Plough deeply, clean cultivation to expose the resting pupae, crop rotation and

avoidance of ratooning reduces pest population.

Use tolerant varieties.

Trap cropping with crops like tomato, and destroying them when the population is high.

Use of maize, and cowpea on borders and wild brinjal and setaria as intercrop

significantly helps in reducing the pest population.

Mechanical Control

Cotton is harvested in 3-4 pickings by hand as the boll mature.

The number of pickings varies with the maturity habit of the variety.

Cotton from damaged boll should not be kept with good quality cotton.

Never pick wet cotton.

On dew days, pick cotton in late mornings to avoid moisture in cotton.

2

Biological Control

Release of egg parasitoids like Trichogramma chilonis or T. brasielenis or T. achaea @

1,50,000 /ha from 45th day onwards at 10-15 days interval (6 releases) and larval

parasitoids such as Chilonus blackburni or Bracon brevicornis or Telenomus heliothidae

or Carcelia illota or Coteria kazat or Campoletis chloridae @ 2000 adults/ha at 15 days

interval.

Release pupa parasitoids Brachymeria sp.

Release of the predators Chrysoperla carnea or Scymnus sp. or Eulophids would

suppress the population of larvae.

Spray HaNPV @ 250 LE/ha from 35th to 60th day of crop stage.

Apply B.t.k.I @ 1 kg/ha.

Application of fungal pathogens like Beauveria bassiana or Neumorea riley under humid

conditions is effective.

Use 5% neem seed kernel extract (NSKE)

Chemical Control

The following insecticides are effective against the pest:

Endosulfan 35 EC 2.5 lit/ha; or

Quinalphos 25 EC 2.0 lit/ha; or

Chlorpyriphos 20 EC @ 2 lit/ha; or

Cypermethrin 10 EC 600-800 ml/ha

Trizophos 40 EC @ 1.5 lit/ha

3

Pink bollworm (Pectinophora gossypiella Saunders )

Identification & Monitoring

This is a major pest, is active from October -

November.

The adult moths are dark with blackish spots on

forewings. The margins of hind wings are deeply

fringed. Wing span is 8-9 mm.

The caterpillars are creamy yellow when young and

turn pink when grown, 8-10 mm long with distinct

brown head.

Eggs are laid on the underside of tender parts of the

plant (shoots, flower buds, leaves and green bolls).

Damage

The damage is caused by the caterpillars by feeding on

the flower buds, panicles and bolls.

The holes of entry close down by excreta of larvae

which are feeding inside the seed kernels. They cut

window holes in the two adjoining seeds thereby

forming "double seeds" and finally damage them.

The attacked buds and immature bolls drop off. Lint is

destroyed; ginning percentage and oil content are

impaired.

For 65-100 days crop, 5-10% infested fruiting bodies is

the ETL.

Cultural Control

Clean cultivation and destruction of crop residues ( fallen leaves, twigs etc.) before the

onset of season.

Plough deeply to expose the hibernating larvae / pupae.

Avoid late sowing of the crop. Early sowing helps in early maturity facilitating escape.

Use of tolerant varieties (Khandwa-2, JKH-1, Abadita, LH 900, Sujay and Desi cotton).

Withholding irrigation water to avoid prolonged late boll production/ formation to

reduce the buildup of over-wintering population.

4

Mechanical Control

Use pheromone traps baited with insecticides to kill the pest/ monitor pest population.

Biological Control

Release of egg parasitoids Trichogramma chilonis or Bracon elechidae or Elasmus

johnstoni or pupal parasitoid Microbracon lefroyi would keep in check the population of

PBW.

Encourage the activities of predators Chrysoperla carnea or Scymnus sp. or Triphles

tantilus or Pyremotes ventricosus (mite) or release them in the fields.

Apply bacterial formulations B.t.k. @1 kg/ha.

Chemical Control

Hot water treatment of the seeds up to 600C kill the hibernating larvae. Treat the seeds

with aluminium phosphide.

Application of insecticides like chlorpyriphos 20 EC or endosulfan 35 EC or triazophos 40

EC @ 2.5 l/ha spray

5

Tobacco caterpillar (Spodoptera litura Fab.)

Identification & Monitoring

The adult moth is stout with brownish forewings and

whitish hind wings.

The caterpillars are pale green with dark markings

initially which later turn dark brown with numerous

transverse and longitudinal bands, 25-35 mm long.

It is found throughout the year.

Set-up pheromone traps to monitor the ETL.

Damage

The larvae feed gregariously on the under surface of the leaves and skeletonize them

Leaving only the mid-rib and veins in severe cases.

They also attack flowers, buds and squares causing considerable loss.

Cultural Control

Plough deeply to expose the pupae and hibernating larvae.

Mechanical Control

Mechanical collection when larvae are feeding in groups, i.e., the younger larvae.

Collection and destruction of egg masses.

Set-up pheromone traps.

Biological Control

Release egg parasitoids Trichogramma sp. (1.5 lakh/ha) and larval parasitoids Chelonus

blackburni or Telenomus remus or Bracon sp.

Release of predators Chrysoperla carnea @ 50,000 /ha.

Spray Spodoptera NPV @ 250 LE/ha.

Apply B.t.k. @ 1 kg/ha.

Chemical Control

Spraying of insecticides endosulfan 35 EC @ 600-750 ml/ ha effectively reduces the

population.

Spraying synthetic pyrethroids fenvalerate 20 EC @ 400-500 ml/ha or cypermethrin 10

EC or

decamethrin 2.8 EC @ 600 - 700 ml/ha is also effective.

6

Spotted bollworm (Earias insulana Boisd Earias vitella Fab. )

Identification & Monitoring

These are major pests

E. vitella is abundant in high rainfall areas and E.

insulana in areas of scanty rainfall.

The pest attacks the crop from 35-110 days of age.

The moths of both the species have wings of about 25

mm. The forewings are grassy green in E. insulana and

pea green with a wedge shaped white band running

from base to outer margin in E. vitella.

Larva is about 20 mm long, spiny, brownish with white

streaks dorsally and pale yellow ventrally in E.vitella and greenish white with black

marks and orange spots on prothorax in E. insulana.

Damage

The caterpillars cause damage by boring into the

growing shoots, buds, flowers and bolls.

The attacked shoots wither, droop and ultimately die,

and flowers and buds drop off.

Infested bolls do not shed, open prematurely and the

quality of the lint is spoiled due to rot setting.

Sometimes pupation takes place in the bolls itself

impairing the development of bolls.

Cultural Control

Plough deeply to expose resting pupae.

Avoid use of nitrogen fertilizers at the reproductive stage.

Use resistant varieties

Planting trap crop of bhendi, uprooting and burning it when the larval population

reaches its peak reduces infestation.

Don't extend the crop period.

Mechanical Control

Collection and destruction of plant debris and trash before sowing.

Collection and destruction of infested bolls.

Set-up pheromone traps @ 10/ha for monitoring the ETL and timing of spray.

7

Set up bird perches.

Biological Control

Release egg parasitoid Trichogramma chilonis, T. brasiliensis, and larval parasitoids

Chelonus blackburni or Bracon brevicornis or Apanteles sp. at 35 to 70 days.

Conserve and encourage the activity of the spiders Thomisus sp. and Neosiana sp.

Chemical Control

Spray insecticides like endosulfan 35 EC or triazophos 40 EC @2.5 l/ha or cypermethrin

10 EC @ 600-800 ml/ha.

Avoid use of conventional sprays repeatedly. Use neem based insecticides like 5% neem

seed kernel extract (NSKE) and commercial neem based formulations @ 500-600 ml/ha,

starting from 45 days age of the crop or when ETL is reached.

8

Jassids (Amrasca biguttula biguttula)

Identification & Monitoring

Pest attacks the crop during 1-50 days age and

attack is severe during winter.

Adults are about 3 mm long and greenish

yellow during summer whereas they develop

reddish tinge during winter. The hind portion of

the forewings has two black spots on the

vertex.

Nymphs are greenish yellow and wedge

shaped.

The eggs are laid into the parenchymatous tissue of the leaves.

Nymph and adult stages last for 7-21 days and 35-50 days respectively. There are a total

of 7-8 generations in a year.

Damage

Both adults and nymphs suck sap from the underside of the leaves and devitalize the

plants.

Leaves turn pale, red rust, curls downwards and dry up when infestation is severe.

Cultural Control

Sow the crop early.

Use resistant varieties such as Khandwa-2 or the varieties having leaves rich in tannin

contents.

Do not use high doses of "N" fertilizers.

Grow cowpea/onion/soybean as an intercrop in cotton to reduce early stage pest.

Use okhra as trap crop.

Adopt proper crop rotation.

Summer deep ploughing to expose soil inhabitating insects.

Remove and destroy crop residues/alternate host plants.

Mechanical Control

Use yellow sticky traps.

Hand picking and destruction of various insect stages.

Destruction of affected plant parts.

9

Destruction of stressed floral bodies.

Destruction of resettled flowers.

Installation of bird perches: "T" shape wooden/bamboo sticks @ 50/ha should be

erected for encouraging predatory birds like king crow, mynah and blue jay.

Biological Control

Release predator Chrysoperla carnea or Coccinella septumpunctata or Syrphus /

Scymnus sp.

Conserve spiders Distina albida and ants like Camponotus sp.

Chemical Control

Apply chemical pesticides only if pest population crosses the ETL.

Spray methyl demeton 25 EC or dimethoate 30 EC.

10

Cotton aphid (Aphis gossypii)

Identification & Monitoring

Pest is active from June-October and February-April.

Aphids are small, soft-bodied insects with a pair of tubular

structures. Aphids live in colonies and reproduce

parthenogeneticlly.

Nymphs are light yellowish green, or greenish black or

brownish. Nymphal period lasts for 7-9 days.

Adults are mostly wingless, but few winged forms can also be

seen with thin transparent wings. Adults live for 12-20 days.

Females are either lay eggs or directly produce young ones

which mature in about 7 days, hence population increases

very fast.

Leaves appear shiny and sticky due to honey dew excreted by the insects.

later, sooty mold grow on honey dew and leaves have a black coating.

Cool weather and humid conditions favour the rapid growth, while heavy rains wash

away the aphid colonies.

Optimal temperature is 25-30 deg C. Low light is favourable whereas strong light

reduces longevity. *15-20% affected plants counted randomly or appearance of honey

dew on 50% plants

Damage

Both adults and nymphs suck sap from the tender

leaves, twigs and buds, and weaken the plants.

Leaf crumbling and downwards curling

Each aphid makes several punctures and excretes

honeydew which encourages development of sooty

mold on twigs and leaves and this leaves a blackened

look of the plants.

Honeydew attracts ants and sooty mold aids in the

development of pathogenic bacteria.

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Cultural Control

Avoid late sowing and excessive use of "N" fertilizers.

Destroy infested shoots during early stages.

Mechanical Control

Handpicking and destruction of various insect stages and the affected plant parts.

Biological Control

Release predator Chrysoperla carnea or Coccinella septumpunctata or Syrphus /

Scymnus sp.

Conserve spiders Distina albida and ants like Camponotus sp.

Chemical Control

Seed treatment with imidacloprid (5 g/kg seed) keeps the crop free of sucking pests over

a month.

Apply chemical pesticides only if pest population crosses the ETL.

Spray chemicals dimethoate 30 EC or methyl demeton 25 EC @ 500-700 ml/ha when the

population reached ETL.

12

Thrips (Thrips Tabaci)

Identification & Monitoring

The pest is active from May- September.

The adults are slender, yellowish brown, 1 mm long.

The tip of the abdomen is curved and abdominal

segments are transversely banded with dark brown

lines.

Males are wingless and females have a long narrow

strap like wings, fringed with hairs.

Nypms are smaaler in size and blackish in colour.

The eggs are laid in slits in leaf tissues; eggs hatch in 5

days time, nymphal and pupal period lasts for 5 and 4-

6 days, respectively.

The adults survive for 2-4 weeks.

High temperature with low rainfall favors multiplication.

Damage

The nyphms and adults suck sap from the lower surface of leaves lacerating the leaf

tissues.

The upper side of the older leaves turn brown and the lower side becomes silvery white.

Leaves become curled, wrinkled and finally get dried.

Cultural Control

Avoid Late sowing.

Grow cowpea/onion/soybean as an intercrop in cotton to reduce early stage pest.

Deep ploughing in summer and weed free field and surroundings.

Grow certified acid delinted seeds of tolerant varieties.

Removal of alternate host plants like kangni and ambadi.

Biological Control

Encourage the activity of parasitoids Thripoctenus briu, Triphleps tantilus and mite

Campsid sp.

Release Trichogramma Chilonis 1.5 lacs/ha and Chrysoperella grubs @ 1-2 plants.

Release Chrysoperla cornea @ 2 larvae/plant in early stage of the plant and 4

larvae/plant in later stage.

13

Release Cheilomenes sexmaculata @ 1.5 lakh adults/ha at random on crop canopy.

Chemical Control

Apply NSKE 5% (neem seed kernel extract) to control sucking pests.

Apply methyl demton 25 EC @ 1500 ml/ha; or

Trizophos 40 EC @ 1500 ml/ha; or

Dimethoate 30 EC @ 750 ml/ha; or

Cartap hydrochloride @ 50 SP @ 1000 g/ha; or

Etho fenprox 10 EC @ 1000 gm/ha

14

White Fly (Bemisia Tabaci)

Identification & Monitoring

The pest occur throughout the year. Generally infests

the crop from November to February.

Nymphs and adults are sluggish creatures, clustered

together on the under surface of the leaves.

Nymphs are pale yellow and adults are yellowish with

white waxy coating on the body.

The hind wings are prominently long.

Eggs are laid singly on the under surface of the leaves.

Routinely check all parts of all fields for whiteflies

using adult and nymph scouting methods.

When populations exceed the thresholds, treat them

where needed.

Be especially alert for rapid whitefly buildup when nearby host crops are in decline.

Sticky traps may be useful for detecting whitefly movement into cotton fields.

Timely insecticide treatment prevents outbreaks and reduces the chance of sticky

cotton and yield loss. Always use action thresholds for insecticide application.

Damage

The nymphs and adults feed on the cell sap, reduce the

vitality of the plant interfering with normal

photosynthesis due to the excretion of honeydew and

formation of sooty mold all the over surface of the leaf

and lints of opened bolls resulting in process of

blackening.

Chlortic spots develop on leaves and in severe cases the

vein becomes translucent, thickened and in many cases it

drops off prematurely.

Sooty mold contaminates the lint.

The insects help in transmitting and spreading of leaf curl

virus (CLCV) disease.

15

Cultural Control

Avoid late sowing and adopt crop rotation with crop which is not the host of white fly

wherever crop rotation is recommended.

Use resistant varieties K-2.

Cultivate alternate host crops such as tomato and castor on the boundaries to trap and

destroy them.

Mechanical Control

Set up yellow pan sticky traps at various places at the canopy height in field.

Remove and destroy crop residues after last picking.

Removal of alternate host plants like kangni and ambadi.

Biological Control

Encourage activities of parasitiods like Encarsia shafeei or Eretmocerous mundus.

Release predators such as Chrysoperla Carea or Melachilus Sexaculatus or Coccinella

septampunctata or Brumus sp. or Scymnus sp.

Release Chrysoperla cornea @ 2 larvae/plant in early stage of the plant and 4

larvae/plant in later stage.

Release Cheilomenes sexmaculata @ 1.5 lakh adults/ha at random on crop canopy.

Spray neem products 1500 ppm.

Chemical Control

Apply insecticide monocrotophos 36 WSC or Quinalphos 25 EC or methyl demeton 25 C

or aephate or trizophos or profenophos at fortnightly intervals.

The application of syntheic pyrethroids (cypermethrin or decamethrin) be restricted or

used in rotation with conventional insecticides.

Apply Neem oil + Teepol @3-3.5 litres + 500 ml/ha.

Apply fish oil resin soap @1.4-1.5 kg/ha.

16

Foliage and Shoot Feeders

Bihar hairy caterpillar (Diacrisia obliqua Walker)

Identification & Monitoring

This pest is a minor pest

The pest is active during July-November.

The adult moths are dull yellow and are profusely

covered with hairs, pale buff

crimson abdomen with black spots.

The caterpillars are gregarious in nature, brownish

orange to yellow, 40-45 mm long and with hairy head.

Eggs are laid in clusters on the under surface of leaves

and pupation takes place in soil or in plant debris in

cocoons.

The life cycle is completed in 6-12 weeks.

Damage

Caterpillars feed on the leaves voraciously and defoliate the plants, leaving only the

mid-ribs and veins in severe cases.

Cultural Control

Planting of castor crop along the borders.

Mechanical Control

Collection and destruction of egg masses.

Mechanical removal of young larvae, up to 10-14 days of age.

Biological Control

Release larval parasite Apanteles diacrisiae.

Chemical Control

Dust the crop with methyl parathion 2% or malathion 5% @30 kg/ha OR Spray the crop

with Chlorpyriphos 20 EC @ @ 1.5 lit/ha or endosulfan 35EC @1.25 lit/ha.

Originally Posted Here: http://www.jnkvv.nic.in/ipm%20project/insect-cotton.html