Cabbage white is a large butterfly, its wingspan reaches 60 mm. The wings are white, from where the butterfly got its name, with small dark dots and tan marks along the edge of the upper wings. Turnip whitewash has a smaller wingspan (up to 45 mm), they have a yellowish tint and larger spots and tan marks.
EGGS AND PUPAE OF CABBAGE WHITEWASH
The whites begin to fly in May, and soon the female cabbage whites lay bright yellow eggs on the underside of cabbage leaves in heaps of 15 to 200 pieces each. The most intensively “populated” is white and cauliflower, especially planted in quieter places (along the walls of a house or a barn). Hatching larvae (caterpillars) first hold together, eating leaves from the underside, then they, having gained a certain mass, sprawl and gnaw leaves from the edges to coarse skeletal veins.
Adult caterpillars (up to 40 mm) leave plants and pupate on fences, walls of buildings, boles and skeletal branches of fruit trees.
Soon butterflies of the second generation appear from the pupae of cabbage whitewash, and if there was no struggle with spring caterpillars, then there will be a more numerous flight of butterflies compared to May flight. Because of this, cabbage in the second half of the growing season can be damaged very much.
MEASURES TO CONTROL CABBAGE WHITEWASH
First of all, it is necessary to destroy spring-flowering weeds, especially cruciferous ones, since butterflies feed on them intensively before carrying out spring laying of eggs. Secondly, after the beginning of the mass flight of butterflies, one must immediately periodically inspect the lower leaves of plants. Clutches of eggs of cabbage whites and accumulations of caterpillars must be immediately collected and destroyed.
When collecting adult caterpillars, you should pay attention to the yellow cocoons, as if adhering to them. This useful insect is the entomophagous (apostles Whitecross). Such caterpillars should be carefully transferred to areas more populated by the pest. The entomophagy will fly out of cocoons and lay its eggs in the bodies of other caterpillars. Useful insects are actively attracted by flowering plants of dill, testes of carrots, parsley, etc.
Against caterpillars of younger ages of the plant, when it is not possible to constantly conduct inspections and fees, you can apply to spray with one of the biological preparations – dendrobacillin (30 g per 10 l of water) or buckskin (15 g per 10 l). Good results are also obtained when spraying cabbage with a low-toxic drug – phytoverm, 0.2% ke. (2 ml per 10 l of water). This is the measure of combating cabbage whit, which we gladly told you about.