Use of preparations with different biological effect in spring vetch and their influence on the productivity and insect pest density.

摘要

The study was conducted during the 2007-2009 period in IFC, Pleven by the split plot method. The effects of Atonic - 0.06 l/da (growth regulator), Masterblend - 160 g/da (combined leaf fertilizer) and Confidor 70 WG (700 g/kg imidacloprid) - 15 g/da (an insecticide) on the dry mass productivity and density of the important insect pests in spring vetch were studied. Treatment was performed once (at the stages of budding and flowering) and twice (at budding and flowering). Measurements of the population density of sucking insect pests (Homoptera (suborder Aphidodea and Auchenorrhyncha) and Thysanoptera order) were conducted from the stage of budding to harvesting of aboveground mass. The use of Atonic, Masterblend and Confidor alone and in combination increased the dry mass productivity of spring vetch by 6.1% to 32.4%. The application of the combinations of Confidor with Atonic and Confidor with Masterblend had the highest efficiency, for which the lowest abundance of the pests was also found irrespective of their order belonging (the decrease was by 40.7-45.5% to 35.7-39.8% for Homoptera and Thysanoptera, respectively, compared to control). It was found that under two-fold treatment of the spring vetch with Confidor and Masterblend (alone and in combinations) at the stages of budding and flowering, the members of the different orders had the lowest abundance, as compared to their single application. That provided higher productivity by 10.6% and 19.0%, respectively as compared to their single treatment.