The wheat trips dynamics in crop rotation

Abstract

The purpose of research is to justify the need for crop protection from wheat thrips. Adults and larvae of the pest damage plants of the Poaceae family. The studies were conducted in 2008-2010 in Kinel district of Samara Region. The object of study is wheat thrips, the subject of study is winter wheat (Povolzhskaja 86), spring wheat (Kinelskaja 59), barley (Povolzhskiy 65). Wheat thrips met in the rotation crops in winter and spring wheat, barley. Proximity fields allow pest to migrate from one field to another. The largest number of adults observed in winter wheat crops in the smallest barley. The average number of of research years phytophage in winter wheat was 710 ind./100 sweeps in spring wheat - 490.5 ind./100 strokes, in crops of barley - 178.7 ind./100 strokes. Most of the pest was observed in all the studied crops sowings in 2010. The number of eggs laid in the middle in winter wheat crops in 2009 ranged from 20.4 to 23.7 ind./spike, in 2010 from 27.9 to 46 8 ind./ spike. In spring wheat the average number of eggs in 2009 was 6.2 ind./spike, in 2010, 9.0 ind./spike. The number of larvae in winter wheat crops in 2009 averaged 4.4 ind./spike, in 2010 32.5 ind./spike. In spring wheat the number of larvae in 2009 ranged from 9.1 to 15.9 ind./spike, in 2010 from 16.1 to 25.8 ind./spike. The number of larvae in the ears of winter wheat in 2010 exceeded the economic threshold of 1.6 times. The damage of wheat grain wheat thrips in 2010 was higher than in 2009. The average damage of winter wheat pest during the studies was 68.4%, of spring - 58.2%.