Lytvyn O. Nodule-feeding weevils of Sitona Germ. genus and their control on pea crops in the Northern Forest-Steppe of Ukraine

The biology, ethology and species composition of the nodule-feeding weevils of Sitona Germ. genus are presented. 14 species had been found among which Sitona lineatus L. and Sitona crinitus Hrbst. were dominant (87,4% and 12,0% respectively). The seasonal and annual populations dynamic of these pests were analyzed. An importance of varieties, terms of sowing and entomophages of Sitona spp. to decrease harmfulness of the pests was shown. Effectiveness of seed dressing and spraying of young pea plants with insecticide to decrease populations and harmfulness of the pea weevils were ascertained. Species composition and correlations among Sitona spp. on plants of the family Papilionatae Taub. were defined more precisely. The weevil Sitona ononidis Shasp for the first time was reported for the Northern Forest-Steppe of Ukraine, which bears evidence on global warming and shows widening of this pest distribution zone and area of harmfulness. The effectiveness of action and duration of insecticides' toxicity for presowing treatment pea seeds against these pests were determined together with economic effectiveness of their application. Insecticides Nurel D, c. e. (0,75 l per ha), Karate Zeon, 050 CS (0,2 l per ha) were the most effective against Sitona spp. Key words: pea, nodule-feeding weevils, variety resistance, sowing, terms, entomophages, seasonal and many-year dynamics of population, protection system against the pest insecs, insecticides, presowing seed treatment, spraying, effectiveness action, economic effectiveness.