棉花大群体小个体抗逆栽培示范区棉铃虫越冬基数调查

Prelinimary Report of Investigation on Hibernating Cotton Bollworn Base in Adverse─resistance Cultivation Demonstration Areas with High─density and Dwarf Culture

棉花大群体小个体抗逆栽培示范区棉田内棉铃虫越冬蛹量比邻近棉花常规栽培区减少６０．１％，玉米、大豆、绿豆及辣椒田内越冬蛹量也分别减少３８．１％，５３．０％，１６．４％和８０．０％。北方半干旱棉区连年大面积推广棉花大群体小个体抗逆栽培，可能会逐年降低生态区内棉铃虫越冬基数和发生量。

The hibernating nymph numbers of cotton bollworm were reduced by 60.1 % in the adverse-resistance cultivation demonstration fields with high─density and dwarf culture, compared with adjacent conventional cultivation cotton fields, menawhile, the hibernating nymph numbers were respectively reduced by 38. 1 %, 53. 0%, 16. 4% and 80. 0% in maize, soybean,gram and hot pepper fields in the demonstration area. Popularizing adverse─resistance cultivation practices of high─density and dwarf culture in a large scale year after year in semiarid areas in the North can reduce incidence of bollworms and hibernating base in the ecological area year by year It opens a way of ecological control to bollworms.