摘要
甜菜白带螟在陕西关中地区对甜菜危害十分严重,可使根减产30％～40％,降低含糖2～3度;甜菜白带螟1年发生4代,且世代重叠,成虫生活期约5～10天,卵期2～10天,幼虫有4龄,历期9～16天,蛹期7～20天;该虫的发生与危害程度与8～9月份平均气温密切相关;试验表明,乙酰甲胺磷与杀虫双对该虫有相同的防效,在其2～3龄期施用(50～100mL/亩)可取得满意的防治效果。
Beet leaftier is very hermful to beet in the middle part of Shanxi, the beet root yield reduced about 30%~40%, and the saccharinity reduced 2%-3%. Beet leaftier has four generations every year. The life-span of adults is about 5-10 days in field conditions. The egg stage lasts for about 2-10 days, and the larva has four instars which take 9-16 days in total. The pupa stage lasts for 7-20 days. Density of infection of beet leaftier is related to the higher cultivating temperature in August to September. The results from large scale field test showed that the Acephate and Sachongshuang are equally effective for the prevention of beet leaflier. To use Acephats or Sachongshuang in the period which the larva is in the 2nd or 3rd generations has satisfactory results with 50-100mL/mu.
关键词
甜菜
白带螟
生物学特性
防治
Beet leaftier
Biological characters
Control
