论文部分内容阅读
棉田二代棉铃虫幼虫危害盛期一般在7月下旬至8月上旬,它是危害最重、最难防治的一代,棉铃虫主要影响结铃率。棉田三代棉铃虫往往与棉田二代重叠发生,一般在8月下旬进入发生盛期,幼虫钻蛀棉桃。棉田二、三代棉铃虫的防治非常关键,如防治不利会给全年棉花生产带来巨大损失,为此,施药防治棉田二、三代棉铃虫要及时、有效才能控制其危害。而机动喷雾施药是化学防治棉田二、三代棉铃虫最有效的措施。
The second generation cotton bollworm larvae of cotton field have a great impact on the bollworm rate since the end of July to early August, which is the most harmful and hard to control. Three generations of cotton bollworm often overlap with the second generation of cotton fields, usually in late August entered the peak period, larvae bore bolls. Prevention and control of cotton bollworm in the second and third generations of cotton fields is very crucial. For example, prevention and control will bring great losses to cotton production in the whole year. Therefore, cotton bollworm should be controlled effectively in two or three generations. However, the application of maneuver spray is the most effective measure to prevent and control cotton bollworm in cotton field in the second and third generation.