As a crop, the seed-rape is a good host plant of a lot of species of harmful insects.From that point of view, the objective of the present investigation is to make detailed biocenological investigations in different ecological districts of the country. The investigation has provided during the period 2003 - 2004. The insect's density has recorded through the standard entomological method - moving with a Sweep net. The established harmful and useful insect species have classified to the following: Orthopteta, Thysanoptera, Hemiptera, Homoptera, Coleoptera, Lepidoptera, Hymenoptera and Diptera.
Investigation on the harmfull and usefull entomophaune by seedrape in different ecological districty in Bulgaria