cotton insects a lecture by mr allah dad khan
TRANSCRIPT
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Cotton Crop Insects A Presentation To IPM
Course/FFS Participants By
Mr. Allah Dad Khan Provincial Coordinator IPM KPK
For MINFAL Pakistan
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Cotton Insects Crop: Cotton Scientific
name: Gossypium spp Family: Malvaceae
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1.Fruit borer: Helicoverpa armigera
Symptoms of damage
1. Bolls showing regular, circular bore holes
2. Larvae seen feeding on the boll by thrusting their heads alone inside and leaving the rest of the body outside
3. Presence of granular faecal pellets outside the bore hole
4. A single larva can damage 30-40 bolls
Feeding Injury
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1.Fruit borer: Helicoverpa armigera
• Egg- Spherical in shape and creamy white in colour, present singly• Larva- Shows colour variation from greenish to brown. It has dark
brown grey lines on the body with lateral white lines and also has dark and pale bands.
• Pupa- Brown in colour, occurs in soil, leaf, pod and crop debrisAdult :
• Light pale brownish yellow stout moth• Forewings are olive green to pale brown in colour with a dark
brown circular spot in the centre• Hind wings are pale smoky white with a broad blackish outer
margin
• Identification of the pest
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1.Fruit borer: Helicoverpa armigera
Egg/Larva/Pupa/Adult
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2.Pink bollworm: Pectinophora gossypiella
Symptom of damage
• Rosetted flowers• Excreta observed at the point of
bore holes by larval feeding. When bolls are opened, damaged seed kernel would be observed.
• They cut window holes (interlocular burrowing) in the two adjoining seeds thereby forming "double seeds"
• The attacked buds and immature bolls drop off
• Discolored lint and burrowed seeds
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2.Pink bollworm: Pectinophora gossypiella
Identification of the pest
• Larva• Shows colour variation. Young larva are
white and late instar becomes almost black, brown or green to pale or pink
• Several dark and light alternating bands running the entire length
• Adult• Small moth• Forewings are brown or dull yellow
olive grey with dark spots• Hind wings margins are deeply fringed •
Adult
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3.Spotted bollworms: Earias vittella, Spiny bollworm: Earias insulana
Symptom of damage• • Drying and drooping of
terminal shoots during pre-flowering stage
• Shedding of squares and young bolls
• Flaring up of bracts during square and young boll formation stage
• Holes on bolls and rotting of bolls
Drying - terminal shoots
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3.Spotted bollworms
Bore holes and rotting Flared square
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3.Spotted bollworms
Identification of the pest: • E. vitella• Larva- Brownish with white streaks dorsally and
pale yellow ventrally, Without finger shaped processes
• Adult• Small buff coloured• Forewings are pea green with a wedge shaped
white band running from base to out margin• Identification of the pest: E. insulana• Larva- Brown with dorsum showing a white
median longitudinal streak. The last two thoracic segments and all the abdominal segments have two pairs of fleshy tubercles (finger shaped processes) one dorsal and the other lateral
• Pupa - Brown and boat shaped• Adult - Small buff coloured. Forewings are
uniformly silvery green
E. vitella - Larva
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3.Spotted bollworms
E. vitella - Adult
E. insulana - Larva
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4.Cotton Stem Weevil: Pempheres (Pempherulus) affinis
Symptoms of damage
• Swellings on the stem just above the ground level
• Young plants are invariably killed
• Older plants that survive lack vigor and strength, breaks at the nodes due to strong wind
Stem Gall
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4.Cotton Stem Weevil
Stem Gall Grub
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4.Cotton Stem Weevil
Identification of the pest
• Larva - Grub, white in colour without leg (apodous)
• Adult - Very small weevil, dark in colour with two small white patches on the elytra
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5.Shoot weevil: Alcidodes affaber
Symptoms of damage
• Terminal shoots with galls• Bore hole surrounded by
raised margins
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5.Shoot weevil: Alcidodes affaber
Identification of the pest
• Adult - Weevil dark greyish brown with pale cross bands on the elytra
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5.Shoot weevil: Alcidodes affaber
Symptoms of damage
• Plants with drooping leaves• Wilting in patches
Affected Stem/Infested Plant
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5.Shoot weevil: Alcidodes affaber
Identification of the pest
• Adult - Dark brown jewel beetle
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6.Leaf roller: Sylepta derogata
Symptom of damage• Leaves rolled in the form of
trumpets fastened by silken threads
• Marginal portion of leaves eaten away
• Plants defoliated in severe attack
Rolled Leaves
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6.Leaf roller: Sylepta derogata Identification of the pest
• Larva- Bright green (glistening) with dark head and prothoracic shield
• Adult- Moth with yellow wings having brown wavy markings
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7.Tobacco Cutworm: Spodoptera litura
Symptoms of damage
• Scrapping the epidermal layer, leaving the skeleton of veins of leaf
• During severe attack, only the stem and side shoots will be standing in the field without any leaf or bolls
• Larvae feed the leaves by making small holes
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7.Tobacco Cutworm: Spodoptera litura
Identification of the pest
• Egg - Laid in masses which appear golden brown
• Larva- Pale greenish with dark markings. Gregarious in the early stages
• Adult: Forewings- brown colour with wavy white marking
• Hindwings- white colour with a brown patch along the margin
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8.Ash weevils: Mylloecerus undecimpustulatus maculosus M. subfasciatus
M. viridanus M. discolor
Symptom of damage• • Leaf margins notched• Wilting of plants in patches• Plants come easily when
pulled• Roots eaten away by grubs
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8.Ash weevils
Identification of the pest
• Grub - Small, white apodous grub
• Mylloecerusundecimpustulatus – Greenish elytra having dark lines
• M. subfasciatus - Brownish weevil
• M. viridanus –small light green weevil
• M. discolor- brown weevil
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9.Leafhopper: Amrasca (Biguttula biguttula) devastans
Symptoms of damage
• Tender leaves become yellow• The margin of the leaves start curling
downwards and reddening sets in• In the case of severe infestation,
leaves get a bronze or brick red colour which is typical “hopper burn” symptom
• The margin of leaves gets broken and crumbles into pieces when crushed
• The leaves dry, shed and the crop growth gets retarded
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8.Ash weevils
Identification of the pest
• Nymph - Light green, translucent, wingless found between the veins of leaves on the under surface
• Adult - Green, wedge shaped leafhopper.
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9.aphid: Aphis gossypii
Symptom of damage
• Infesting tender shoots and under surface of the leaves
• Curling and crinkling of leaves• Stunted growth• Blighted appearance when
infestation is severe• Development of black sooty
mould due to the excretion of honey dew giving the plant a dark appearance
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9.aphid: Aphis gossypii
Identification of the pest
• Nymphs - Yellowish or greenish brown found on the undersurface of leaves
• Adults - Greenish brown, soft bodied and small insects
• Winged forms may be seen under crowded conditions
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10.Thrips: Thrips tabaci
Symptom of damage
• Shriveling of leaves due to scrapping of epidermis and de-sapping
• Attacked terminal buds-have ragged edges
• Silvery shine on the undersurface of leaves
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10.Thrips: Thrips tabaci
Identification of the pest
• Nymphs - Very minute, slender, yellowish and microscopicAdult - Small, slender, yellowish to brown with fringed wings
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11.Whitefly: Bemisia tabaci
Symptom of damage
• Chlorotic spots on the leaves which latter coalesce forming irregular yellowing of leaf tissue which extends from veins to the outer edges of the leaves
• Severe infestation results in premature defoliation
• Development of sooty mould• Shedding of buds and bolls and
poor boll opening• It also transmits the leaf curl virus
diseases of cotton
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11.Whitefly: Bemisia tabaci
Identification of the pest
• Nymph- Greenish yellow, oval in outlinePupa- Oval in shape, present on the under surface of the leavesAdult- Minute insects with yellow body covered with a white waxy bloom
Nymph/Pupae/Adult
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12.Red cotton bug: Dysdercus cingulatusi
Symptom of damage
• Red stained lint and rotting bolls
• Inner boll wall with warty growth or water soaked spots
• Young bolls abort and turn dark brown
• The bacterium Nematosporagossypii enters the site of injury and stains the fibre
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12.Red cotton bug: Dysdercus cingulatusi
Identification of the pest
• Nymphs and Adults - Reddish bugs with white bands on the abdomen and black markings on the wings
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13.Dusky cotton bug: Oxycarenushyalinipennis
Symptom of damage
• Sucks the sap from developing seeds in open bolls and stains the lint black
• Seeds discolored and shrunken
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13.Dusky cotton bug: Oxycarenushyalinipennis
Identification of the pest
• Eggs - Cigar shaped, white eggs in clusters of 2-10 within the half opened bolls, on the bolls, flower or buds
• Nymphs and adults - Dusky, greyish brown bug, with pointed head and hyaline wings
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14. Mealy bugs: Phenacoccus sp, Ferrisa spand Maconellicoccus
sp Symptom of damage
• Heavy clustering of mealy bugs usually seen under surface of leaves as a thick mat with waxy secretion
• Excrete copious amount of honey dew on which the fungus sooty mould grow
• Affected plants appear sick and black, resulting reduced fruiting capacity