论文部分内容阅读
甜菜叶螟在苏北沿海垦区一年发生5代.2-5代主要为害糖甜菜,第5代亦为害越冬采种甜菜,以第4代为害最重。作者对其形态特征、生活习性做了十分详尽的观察与描述。经试验,选用内吸杀虫剂效果优于触杀剂。最有效的杀虫剂为50％胺敌磷,防效为60—100％。此外,农业措施、保护捕食性与寄生性天敌均为有效防治手段。当3、4代每百株甜菜有虫分别在600—670头、700—799头时为初拟防治指标。
Beet army leaf borer in northern Jiangsu Coastal reclamation area occurred 5 generations a year .2-5 generations of sugar beet mainly harmful to the fifth generation also overwinter winter planting sugar beet, the fourth generation of the most damaging. The author made a very detailed observation and description of his morphological characteristics and living habits. After testing, the choice of insecticides within the better than touch kill agent. The most effective insecticide is 50% amine phosphorus, anti-60-100%. In addition, agricultural measures to protect predatory and parasitic natural enemies are both effective control measures. When 3,4 generations of sugar beet per hundred plants in 600-670, 700-799 when the initial control index.