论文部分内容阅读
我县多宝区农科站三生产队,一九七四年在棉田间作高梁175亩,每亩零星种高梁七、八十株。在七月下旬第三代棉铃虫发生期间,高粱已出穗。据七月下旬至八月初调查,每百穗高梁有棉铃虫幼虫460头,发育进度比棉株上的幼虫早五到七天。当时即组织群众捕捉围歼,共捉虫37586头,大大压低了第四代棉铃虫数量。据第四代
In our county, there are three production teams of Agricultural Station in Duobao District. In 1974, 175 mu of sorghum was made in the cotton field, with seven or eighty strains of sorghum per acre scattered. During the third generation of cotton bollworms in late July, sorghum had sprouted. According to a survey conducted in late July to early August, there were 460 larvae of Helicoverpa armigera per 100 spikes, progressing five to seven days earlier than those on cotton plants. At that time, organizing the masses to capture and annihilate a total of 37586 catches of insects, greatly reducing the number of the fourth generation of cotton bollworm. According to the fourth generation