Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 2
Written by Stefan RASHEV, Nedyalka PALAGACHEVA, Stoyan GEORGIEV
Rapeseed is attacked by a number of enemies, of which the rapeseed weevil (Meligethes aeneus F.) and the pod borer (Ceutorhynchus assimilis Payk.) are of important economic importance. They damage the generative organs, which is why mining is directly dependent on the organization and effectiveness of the fight against them. In recent years, the mass use of chemical means to combat them leads to the development of resistance, the destruction of useful species and pollinators of cultivated plants. In order to limit their application, alternative means of control are sought to avoid the negative consequences of the use of chemical preparations. In this regard, the efficacy of plant extracts from: walnut (Juglans regia L.), wild walnut (Ailantthus altissima Swing.) and tobacco (Nicotiana tabacum L.) against the adult forms of the rape blossom borer and the pod beetle was tested under laboratory conditions. The attempt was made in four variants and three repetitions. The obtained results show that the compounds contained in the plant extracts exhibit efficacy against the adults of the rape flower borer and the pod borer. The obtained results are a prerequisite for the application of the plant extracts in the integrated systems to combat the enemies of rape.
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