【摘要】 瓜螟Diaphania indica（Saunders）是葫芦科蔬菜上的主要害虫。在杭州,一年发生4—5代,以蛹在桔叶,瓜架竹杆内越冬。1—2代主要为害丝瓜和冬瓜,3—5代主要为害冬瓜和秋黄瓜。一龄幼虫头宽为0.234毫米,Dayer常数为0.62,幼虫共5龄,取食量随龄期的增加而增大。产卵前期为2～3天,卵、幼虫和蛹期分别平均为4.6,11.7和8.4天。卵、幼虫,蛹和世代（卵一卵）的发育历期与日平均温度的曲线回归方程为:Ye=12877640x^-4.6379,Y=279253x^-2.9963,Yp=211317x^-3.1155和Yg=8857x^-1.7476,田间每年在6～10月发生,以8～9月虫量最多,在丝瓜、冬瓜和黄瓜生长季节出现两个虫量高峰,第一个虫量高峰期三种瓜类各不相同。更多还原

【Abstract】 Indian cabbage moth,Diaphania indica(Saunders),is one of the main pests on cucumbers.It has 4-5 generations per year in Hangzhou and hibernates by pupa in dead leaves and bamboo poles used as the cucumber trellis.1st and 2nd generations of Indian cabbage moth damage mainly Luffa cylindrica Roem.and Benincasa hispida Cogn.,and its 3-5th generations damage mainly B.hispida Cogn.and Cucumis sativus L.The head width of its first instar larva is 0.234 mm and its Dyar contant is 0.62.Its larva has five instars and the mean leafarea eaten by its larva per day is increased with the increase of the instar.The preoviposition period is 2-3 days.Mean developmental periods of its egg,larva and pupa are 4.6,11.7 and 8.4 days,respectively.Regression equations of developmental period to the mean temperature per day of its egg,larva,pupa and generation are Ye = 12877640x-4.8378,Y1 = 279253 x-2.9863,Yp = 211317x-3.1155 and Yg = 8857x-1.7476,respectively.It occurs from June to October in the field and the peak period of its density is August and September.It has two peaks of density on cucumbers,and the first peaks occur at different times on different cucumbers.更多还原