EAP Publications | Virtual Library | Magazine Rack | Search | What's newJoin the Ecological Solutions Roundtable
Adult: cabbage butterfly, white butterfly, tinged with yellow and having 3 or 4 black spots on it's wings which spread to about it' to nearly 2". It emerges with the coming of warm weather in spring.
Egg: Tiny, bullet shaped, ridged, pale to intense yellow in colour. Eggs usually laid on underside of leaves. Hatch in 7 or more days in spring.
Larva: velvety green caterpillars, each having slender orange stripe dorsally and paler broken stripes laterally. Has 5 pairs of prolegs. Attains length of It' - 12t' long then changes to pupa.
Pupa: Naked~grey, green or tan with angular projections suspended by a silk belt. After a week to 10 days it changes to adult.
There are 2 to 3 generations/year in North latitudes.
|CONTROL||STAGE||DESCRIPTION, MIXTURES & AMOUNTS||EFFECT ON PEST|
|2. Physical||Adult||Protective canopies of light-weight polyethylene to prevent infestation||Prevents adult from laying eggs on other cabbage leaves|
|3. Behavioural||Larvae||Anti metabolites (e.g.) imidazole with oil in water spray||Prevents them from eating|
|a) Repellants||Larvae||Southern wood and European wormwood|
|Larvae||Sour milk or butter milk skim milk mixed with vinegar - spoon sour milk into centre of cabbage||Keeps larvae away|
|b) Companion plants||Larvae||Interplanting of mint, sage, rosemary, tansy, catnip, nasturtium, tomatoes and celery||Repels the larvae|
|c) friendly insects bacteria||Eggs||Trichogramma (wasp)||Feeds on egg|
|Larvae||Yellow jacket hornets||Feeds on larvae|
|Eggs||Braconid wasps||Feeds on egg|
|Larvae||Bacillus thuringiensis (available as wettable dust under names of Thuricide and Biotrol). Be certain that the plants are thoroughly dusted so that larvae will be able to feed on dust.||Kill larvae|
|Larvae||Black birds||Eat the larvae|
|4. Harmless pesticides/ others|
|a) sprinkling||Larvae||Salt and flour mixture : ½ cup of salt and 1 cup of flour. Mix the two and sprinkle over plant. Add 1 oz. Of mixture to the worst affected plants.||Larvae eats mixture, bloats up and falls dead.|
|Larvae||A little salt is sprinkled from shaker-about twice as much as you would use in your food||Kills larvae|
|Larvae||Rye flour - the finer the particles the better the adherence onto the insects body. One pint in enough for all plants in a small garden.||Cabbage moth and larvae with dough sticking to their wings, hands and bodies. Sun bakes dough hardens and kills them|
|b) Sprinkling||Larvae||Dry material (powdery) road dust, wood ash and cornmeal amount to cover the insect body||Block pores prevents respiration|
|c) Spray||Larvae||Water - use force but little water to avoid drenching the bed. Use ordinary spray or pressure tank.||To wash of younger cabbage worms from plants that would be injured by water.|
|Larvae||Salt solution : one table spoon or 2 oz. Of salt mixed with a gallon of water||To control cabbage worms|
|Larvae||Hot pepper solution : ground up several pods of hot pepper with equal amount of water, add ½ spoon of soap, powder to make the material adhere||Kills larvae|
|Larvae||White hellebore with milk - the powder from rhizomes and rootlets of the hellebore plant is taken and mixed with milk and sprayed||Kills larvae|
|Larvae||Pyrethrum : ground flowers of certain species of chrysanthemum contain insecticide. It is a preharvest spray because its breaks down rapidly in sunlight or strong artificial light.||Rapid "knock down" power|
|Larvae||Derris - a tuba root||Stupefy the larvae|
|Rotenone - made up roots of different species of trees especially lonchocerpus from L.Amer. Cube from Peru and timbo from Brazil||Slows down the rate of heart action and breathing|
|Larvae||Ryania dust obtained from L.Amer. Shrub. Ryania native of Trinidad amounts used does not injure plant tissue.||It puts larvae in "flaccid paralysis" appetites wane, become incapable of normal activity and stop feeding|
|Larvae||Nicotine : an antilarval spray. Boil 4 oz. Of non filter tip cigarettes of ½ lb. Of filter tips in a gallon of water for ½ hour. Strain clear brown liquid through nylon stocking||Kills larvae.|
Copyright © 19--
Info Request | Services | Become EAP Member | Site Map
Give us your comments about the EAP site
Ecological Agriculture Projects, McGill University (Macdonald
Ste-Anne-de-Bellevue, QC, H9X 3V9 Canada
To report problems or otherwise comment on the structure of this site, send mail to the Webmaster