The cabbage fly particularly prefers cauliflower for laying eggs.
As early as mid-April, the cabbage flies lay their eggs on the root neck of the cauliflower plants. The larvae gnaw the root neck, bore into it and thus prevent the plants from developing. Where to watch out, no damage occurs. Daily spot checks are necessary, so you can see, whether oviposition has taken place. The whitish ones, only millimeter-long eggs are usually found in groups close to the ground on the root neck of the plants. If eggs are found, then wait a few more days and then apply a casting agent against cabbage flies. Watering is repeated after about a week. Who wants to be absolutely sure, Water the cauliflower with the product immediately after planting and repeat this precautionary measure at intervals of 8 days twice more.