Stankevych S. Cabbage flea beetles, rape weevil on spring rape and mustard in EasternSteppes of Ukraine. Their harmfulness and protection measures improvement

Dissertation is devoted to study the species composition of olive pests of cabbage plants, seasonal population dynamics and harmfulness of the dominant species in terms of the Eastern steppes of Ukraine and improve the system of protection. The influence of spring rape shootsdamage by cabbage flea beetles on the productivity and mass of 1000 seeds on agriculturalbackground with fertilizers (N30P30K30) and without fertilizers was determined. The effect of spring rape seed damage by rape weevil larvae on such indicators aslaboratory germination, mass 1000, fullness, fat and protein content wasdetermined. The negative effect of disinfectants on the laboratory germinationof spring rape seeds was proved. Theeconomic effectiveness of pre-sowing intoxication of spring rape seed material onagricultural background with fertilizers (N30P30K30) and without fertilizerswas estimated. Technical and economic efficiency of application of insecticideand micro biological preparation during the phenophase of yellow bud of oilcabbage crops in defense against rape weevil was defined.