论文部分内容阅读
1990年6月底至7月初在北京郊区顺义县和延庆县调查发现,当小麦黄熟及收割后,麦田中的粘虫幼虫(当地的第一代)大量转移至玉米田。此时正值夏玉米喇叭口期,喇叭口中有粘虫幼虫1～4头不等,有虫株占32～40％。为此,9月5日在生防所试验小区内。做了在玉米喇叭口中释放中华卵索线虫感染期幼虫防治粘虫(幼)的探索性试验。9月5日下午,在玉米的小区内,选择株高45厘米左右的玉米15株,在每株喇叭口中各投入粘虫3龄幼虫(实验
A survey conducted in Shunyi and Yanqing counties in the suburbs of Beijing between the end of June and early July 1990 found that after the wheat was ripened and harvested, the armyworm larvae (the first generation in the field) were largely transferred to the corn fields. At this time positive summer trumpet trumpet mouth bell mouth larvae have 1 to 4 range, with worms accounted for 32 to 40%. To this end, September 5 in the biological protection zone pilot area. In the corn trumpet released Chinese Eggplant nematode infection larvae to control armyworm (young) exploratory test. On the afternoon of September 5, 15 maize plants about 45 cm in height were selected in the maize plot, and the 3rd instar larvae of armyworm