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Evolution and InnovationSave Biodiversity...Rise

Cole Crops

COLE CROP PESTS :

Crop: Cole crops

Family: Cruciferaceae

Diamond back moth: Plutella xylostella

Symptoms of damage:

  • Young caterpillars cause small yellow mines on leaves
  • Scrapping of epidermal leaf tissues producing typical whitish patches on leaves
  • Full-grown larvae bite holes in the leaves and feeds on curd

Identification of pest:

  • Egg: Minute yellow coloured eggs laid singly or in groups on the upper surface of leaves
  • Larva: Pale yellowish green caterpillar
  • Pupa: Pupation takes place on the foliage in a transparent cocoon
  • Adult: Small greyish brown moth. Forewings have three white triangular spots along the inner-margin. Adult folds the wings that appear with triangular markings, opposite wing with diamond shape.

Management:

  • Remove and destroy all debris and stubbles after harvest of crop
  • Grow mustard as trap crop at 2:1 ratio (cabbage: mustard) to attract DBM for oviposition at least 10 days ahead of   planting of main crop
  • Spray mustard crop with dichlorvos 76 WSC 0.076% to avoid dispersal of the larvae
  • Pheromone traps @12/ha
  • Crop rotation with cucurbits, beans, peas, tomato and melon
  • Larval parasitoid: Diadegma semiclausm @1,00000/ha (Hills–below 25–27ºC) Cotesia plutellae (plains) at 20000/ha release from 20 days after planting
  • Bacillus thuringiensis var kurstaki 2g/lit
  • Neem seed kernel extract 5%
  • Cartap hydrochloride 0.5% at 10,20 and 30 DAS (nursery) and primordial stage

Affected curd Scrabbing the leaves
Larva Adult
Insecticide Dose
Azadirachtin 5% Neem Extract Concentrate 5.0 ml/10 lit.
Lufenuron 5.4 % EC 1.2 ml/lit.
Spinosad 2.5 % SC 1.2 ml/lit.
Trichlorofon 50 % EC 1.0 ml/lit.

Cabbage borer: Hellula undalis

Symptoms of damage:

  • The larva webs the leaves and bore into the stem, stalks or leaf veins

Identification of pest:

  • Egg:  Yellow shiny eggs laid on the leaves
  • Larva: Full grown larva are greyish-yellow with seven purplish brown longitudinal stripes
  • Adult: Pale greyish brown moth with wavy grey markings

Management:

  • Collect and destroy mechanically caterpillars in the early stages of attack
  • Bacillus thuringiensis @ 2g/lit at primordial stage
  • Cartap hydrochloride @ 500g/ha or malathion 50 EC @500ml/ha
Webbing Bore hole on the stem
Larvae Adult

Leaf webber: Crocidolomia binotalis

Symptoms of damage:

  • Young larva feeds gregariously on leaves
  • Later webs together the leaves feed within

Identification of pest:

  • Egg: laid in groups under surface of leaves.
  • Larva: green coloured
  • Pupa: pupation takes place within the webbed up leaves
  • Adult: Forewings having distinct wavy lines and prominent wavy spots. Hind wings are semi hyaline colour

Management:

  • Remove and destroy the webbed leaves with caterpillars within
  • Set up light traps@1/ha
  • Encourage the activity of parasitoid: Cotesia crocidolomiae
  • Spray malathion 50 EC @ 0.1% or carbaryl 0.2%

 

Larval webbing the head Larval scrabbing the leaves

Larva Adult

Cabbage green semilooper: Trichoplusia ni

Symptoms of damage:

  • Scrabbing of leaves initially and defoliation

Identification of pest:

  • Egg: Greenish-white, spherical and sculptured eggs laid singly on ventral surface of leaves
  • Larva: Slender and green in colour with light wavy lines
  • Adult: Stout, brown moth, head and thorax grey in colour, abdomen white. Forewings grey wavy in colour with a slendery-marking

Management:

  • Hand pick and destroy the caterpillars
  • Set up light trap @1/ha
  • Spray insecticides like malathion 50EC @ 0.1% ha

Larva Adult

Cabbage butterfly: Pieris brassicae, P.rapae

Symptoms of damage:

  • Defoliation
  • Bores into the heads of cabbage

Identification of pest:

  • Larva: Velvetty bluish green in colour with black dots, Yellow dorsal and lateral stripes covered with white hairs.
  • Pupa: chrysalis which takes place in leaves and stem
  • Adult: White butterfly

Management:

  • Collect and destroy caterpillars in the early stage of attack
  • Conserve parasitoids like Cotesia glomeratus
  • Spray insecticides like quinalphos 25 EC @1000 ml
Egg Larva
Pupa Adult

Tobacco caterpillar: Spodoptera litura

Symptoms of damage:

  • Damage leaves and heads of cabbage and cauliflower
  • Damage leaves of radish and beet root

Identification of pest:

  • Egg: Masses appear golden brown
  • Larva: Young caterpillars are light green with black head or black spots.  Well grown caterpillars are grey or dark brown
  • Adult: Adult moths are brownish colourForewings are brown colour with wavy white marking, Hindwings are white colour with brown patchs along the margin

Management:

  • Plough the soil to expose and kill the pupae
  • Grow castor along border and irrigation channel as trap crop
  • Flood the field to drive out the hibernating larvae
  • Set up light trap @1/ha
  • Pheromone traps (Pherodin SL) @ 15/ha to attract male moths
  • Hand pick grown up larvae and kill them
  • Spray Sl NPV @ 1.5 X 1012 POBs/ ha + 2.5 Kg crude sugar + 0.1 % teepol
  • Poison bait: Rice bran 5 Kg + Molasses or Brown sugar 500g + Carbaryl 50 WP 500g+ 3lit of water/ha
  • Spray chlorpyriphos 20 EC 2lit/ha or dichlorovos 76 WSC 1 lit/ha






 
Larva Adult
Cabbage aphid: Brevicoryne brassicae

Symptoms of damage:

  • Yellowing
  • Crinkling and cupping
  • Distorted primordia
  • Presence of white cast skin at the base of the plant

Identification of pest:

  • Nymphs and adults yellowish green with wavy white filament over the body

Management:

  • Install yellow sticky trap @12 no/ha to monitor “macropterous” adults (winged adult).
  • Spray neem oil 3 % with 0.5 ml Teepol/lit
  • Spray any one of the following insecticide
Larva Adult
Insecticide
Dose
Azadirachtin 0.03% WSP (300 ppm) 5.0 g/lit.
Dimethoate 30 % EC 6.0 ml/10 lit.
Malathion 50 % EC 1.5 ml/lit.
Phosalone 35 % EC 1.5 ml/lit.
Quinalphos 25 % EC 1.0 ml/lit.

Mustard aphid: Lipaphis erysimi

Symptoms of damage:

  • Both nymph and adults suck the sap from leaves, buds and pods
  • Curling of infested leaves and at advanced stage plants may wither and die
  • Plants remain stunted and sooty molds grow on the honeydew excreted by the insects

Identification of pest:

  • Aphids: Small, soft-bodied, pearl-shaped insects

Management:

  • Set up yellow stick trap to monitor aphid population.
  • Conserve the natural enemies viz., Cocciniella septempunctata, Menochilus sexmaculata,
  • Spray dimethoate@ 2 ml /lit
Leaf mining


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