Crop Protection Pests of cole crops

1. Crop Protection :: Pests and
diseases of cole crops
Crops: Cole crops
Family: Cruciferaceae Presented by:
Ramesha N M

2. Pests of crucifers

3. 1. Diamond back moth:
Plutella xylostella
• Symptoms 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
Affected curd Scrabbing the leaves

4. Identification of the Pest
Egg - minute yellow coloured.
Eggs laid singly or in groups – upper
surface of leaves.
Larva - Pale yellowish green caterpillar
Pupa: Pupation takes place on the foliage
in a transparent cocoon
Adult
It is a small greyish brown moth
Forewings - has three white triangular
spots along the inner-margin
When at rest the triangular markings of
opposite wings gives diamond shape
Hind wings – have a fringe of long fine
hairs
Larva
Adult

5. Management
Remove and destroy all debris and stubbles after harvest
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
Cotesia plutellae at 20000/ha 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

6. Cabbage borer: Hellula undalis
Webbing
Bore hole on the stem
Symptoms of damage
The larva webs the
leaves and bore into the
stem, stalks or leaf veins

7. CABBAGE LEAF WEBBER-Crocidolomia
pavonana,Pyralidae: Lepidoptera
• Caterpillar webs together the foliage and
feeds on leaves.
• It alsofeeds on flowers and pods and flower
heads in cabbage and cauliflower.

8. 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%

9. 4. Cabbage green semilooper: Trichoplusia ni
Symptoms of damage
Scrabbing of leaves initially and defoliation
Identification of the pest
Larva Adult

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

11. Identification of the pest:
Larva
Velvetty bluish green in colour
with black dots
Yellow dorsal and lateral stripes
covered with white hairs.
5. Cabbage butterfly: Pieris brassicae, P.rapae
Symptoms of damage :Defoliation
Bores in the heads of cabbage
Eggs
Larvae

12. Pupa
Adult
Pupa: chrysalis which takes place in leaves and stem.
Adult: White butterfly

13. Management
• Collect and destroy caterpillars in the early
stage of attack
• Conserve parasitoids like Cotesia glomeratus
• Spray insecticides like quinalphos 25EC
@1000 ml

14. 6. Tobacco caterpillar: Spodoptera litura
Symptoms of Damage
Damage leaves and heads of cabbage and
cauliflower
Damage leaves of radish and beet root

15. Larvae
Adult
Adult
Forewings – brown colour with
wavy white marking
Hindwings- white colour with a
brown patch along the margin
Identification of the pest
Egg: -masses appear golden
brown
Larva
Young caterpillars are light green
with black head or black spots
Gregarious in the early stages
Well grown caterpillars are grey
or dark brown

16. Management
Plough the soil to expose and kill the pupae
Grow castor along border 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
Collect and destroy egg masses in castor and tomato
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
Mix the ingredients well – Kept around the field in the evening hours
Spray chlorpyriphos 20 EC 2lit/ha or dichlorovos 76 WSC 1 lit/ha

17. 7. 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 the pest
Nymphs and adults yellowish green with wavy white filament
over the body

18. Management
Install yellow sticky trap @12 no/ha to monitor
“macropterous” adults (winged adult).
Spray neem oil 3 % with 0.5 ml Teepol/lit
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.

19. 7. 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 honey dew.
Identification of the pest
Aphids - are small, soft-bodied, pearl-shaped
insects

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

21. Painted bug
Bugs are small, black in colour with red and yellow
lines. It lays barrel shaped brown eggs.
Symptoms and damage
Both adults and nymphs suck sap from the leaves,
shoots and affect the vigour of the plant, results
leaf withers.
Management
Single or spot application of dimethoate and
oxydemeton methyl 0.05% would be effective

22. Removal and distruction of crop residues to break the cycles of
painted bugs as well as leaf webbers in specific localities,
· PI 234599 in cabbage having shiny leaves with moderate resistance
to diamond back moth.
· Growing mustard as trap crop in cabbage or cauliflower fields.
Mustard should be sown in paired rows (one row 15 days after
planting and another 30 days after planting cabbage or cauliflower) for
every 25 rows of cauliflower/cabbage.
· Application of neem seed kernal extract (5%) in synchrony with
diamond back moth/leaf webber on cabbage, which is safer to
parasitoids like Cotesia plutellae
· Resorting to cartap hydrochloride /B.t formulation applications,
·

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