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根蛆是白菜、萝卜等秋菜上的重要害虫。白菜受害后,幼虫串食植株根部及周围菜帮,轻者植株发育不良、畸形或外帮脱落,重者不堪食用。萝卜受害后,幼虫不仅为害表皮,造成许多弯曲的沟道,形成所谓雕刻萝卜,还能蛀入内部造成孔洞引起腐烂,失去食用价值。由于根蛆的为害,有利于软腐病菌的侵入,常引起腐烂病的大发生。从我们近几年对兰州市近郊四区调查情况看,根蛆对秋菜的危害十分严重,被害株率一般在30—40％,重者达100％。为了消灭种蝇为害,我们针对种蝇在秋菜上的发生规律进行了田间药剂防治试验。现将试验结果整理如下: 1.20％异柳磷毒砂防治种蝇。用山东胶县农药力生产的20％异柳磷1份加湿细砂200份,于包心菜播种时,盖在穴播白菜种子上,以不施药为对照。结果表明,异柳磷毒砂防治种蝇
Root maggots cabbage, radish and other autumn vegetables on the important pests. After the cabbage victimized, the larvae fed on the roots and around the vegetable gangs. The light plants developed dysplasia, deformity or external help shedding, severe cases of unbearable consumption. After the radish is killed, the larvae not only damage the epidermis, resulting in many curved channel, the formation of the so-called carving radish, but also erode the hole caused by internal decay, loss of food value. As the root of maggot damage, is conducive to the invasion of soft rot bacteria, often causing a large occurrence of rot disease. In recent years, from the investigation of the suburbs of Lanzhou City in four districts, the root maggots have a very serious harm to autumn vegetables. The rate of the victims is generally 30-40% and the weight is up to 100%. In order to eliminate the flies damage, we conducted a field experiment on the prevention and treatment of flies in the autumn vegetables. Now the test results are organized as follows: 1.20% Isofiuoxiu arsenic control fly species. With Shandong Pesticide pesticide force of 20% isofloxacin 1 wet humid sand 200 parts, planting cabbage seeds, covered in the sowing cabbage seeds to not spraying as a control. The results show that isofiuocarb arsenopyrite prevents flies