大豆食叶害虫潜叶吉丁的初步观察

大豆潜叶吉丁是大豆上新发现的一种食叶害虫。成虫取食叶片,幼虫潜入叶片组织取食叶肉,老熟幼虫在叶片内化蛹。成虫体长2.63～3.23毫米,宽1.80毫米,体扁平,黑色有光泽,鞘翅上布有白色茸毛的一条“y”形斜带和二条波纹状横带。卵长0.91～1.03毫米,宽0.59～0.69毫米,扁椭圆形。老熟幼虫体长6.60～7.33毫米,宽1.26～1.55毫米,扁平楔形,乳白色,各体节背板与腹板均有几丁质化黑褐色斑纹。蛹长3.16～3.69毫米,宽1.72～2.16毫米,扁椭圆形。一年发生2～3代。

Biologic Observations on Trachys aegualipennis Des. et Vil

Trachys aegualipennis Des. et Vil. is a newlydiscovered insect pest infesting soybean. The adults feed on soybean leaves. The larvae mine soybean leaves and pupate in mining traces. The adult is flat,blackish and shining,with length 2. 63～3. 23mm and width 1. 80mm. The wings have a Y—shaped oblique streak,with whitish setae,and two sinuate transverse streaks. The egg,flat and oblong oval,is 0. 91～ 1. 03mm long and 0. 59～0. 69mm wide. The mature larva,length 6. 60 ～7. 33mm, width 1. 26～1. 55mm,is flat, wedge — shaped and milky white. Tergal and sternal marks are blackish brown, chitinized. The pupa,length 3.16～3. 69mm,width 1. 72～2. 16mm,is flat,oblong. This species has two to three generations a vear.