Do you think Cabbage is only man’s favorite, no you are completely wrong. Cabbage is been eaten by root fly, caterpillars, aphids, Cabbage Webworm, and Cabbage looper.
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Cabbage Root Fly
Maggots often cause damage. They hatch from eggs laid on the soil, eat the roots, and leave the stumps to rot. Once present, they are impossible to get rid of. To prevent flies from laying their eggs in the first place, use a covering of fleece or fine net or collars around the seedlings. Collars can be purchased or simply fashioned from squares of carpet underlay, cut so they can be slipped around the seedlings. Any eggs laid on the collars will die before hatching.
Burrow into the heart and eat holes in the leaves. The caterpillars of the large cabbage white butterfly are yellow, black and hairy; the small cabbage white butterfly pale green and the cabbage moth yellow-green or brown. Pick them off by hand or spray with pyrethrum.
Mealy Cabbage aphids
They are so-called because the grey aphids are covered with white wax. They congregate beneath the leaves, suck the sap, and cause yellow patches and leaf curl. Spray with insecticidal soap, pyrethrum.
Other pests include cutworms, flea beetles, leather jackets, whitefly, slugs and snails, and birds.
Diseases of Cabbage
It is a very serious problem indeed. It is a fungus or mold that attacks roots and, as it kills them, releases spores into the soil. Leaves start to discolor, the plant becomes stunted, and eventually, it dies. What’s worse is that the spores can survive in the soil for up to 20 years and there is no cure.
Preventative measures include systematically rotating crops, burning all diseased plants, improving drainage, liming the soil and planting out only when seedlings are already sufficiently established to be less vulnerable.
Other diseases include downy mildew, powdery mildew, bacterial leaf spot, and white blister.