Study on the Cotton Bollworm (Helicoverpa armigera) and Forecasting Method for Its Major Generation in Jianghan Plain
Rui Wang · 2001
The study showed that the egg density in major generation of cotton bollworm is greatly related to the peak egg density in pre generation, cotton boll number at July 15,the accumulation of the temperture average in the last ten days of April, and the average temperature monthly in May, June and July was quantitatively described with fuzzy analysis method, respectively. It was based on the factors selected from the cotton bollworm population density,cotton growth status and weather information during 1980~1998 by classic statastic analysis methods. The fuzzy formulation used to predicate the cotton bollworm population density of the major generation in 1999 in Tianmen and Jingzhou. It correspondenced with actural situation.