简阳市棉铃虫超常发生情况及其原因１９９６年简阳市出现了前所未有的棉铃虫超常发生，全市３０万亩棉田，各代棉铃虫累计发生面积达４０万亩次，无论发生数量和发生面积，都超过了有记录以来的任何一年，已成为棉花生长中后期的主要害虫，现将１９９６年超常发生的主要特... Unusual occurrence of Helicoverpa armigera and its causes in Jianyang City In 1996, an unprecedented incidence of cotton bollworm occurred in the city of Jianyang. The city’s 300,000 mu of cotton fields had an accumulated area of ​​400,000 mu of cotton bollworms of all generations, regardless of the number of occurrences and the occurrence area Exceeds any record since the year, has become the main pest in the late cotton growth, the extraordinary occurrence of 1996 now the main special ...