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油菜从出苗到成熟都易受到蚜虫、菜青虫和黄曲条跳叶甲三大害虫的危害,受害油菜苗轻则长势衰弱,产量和品质下降,重则全株死亡。采取针对性措施加强对害虫综合防治是确保油菜高产的关键环节。一、危害症状与特点1.蚜虫:以成蚜和若蚜刺吸油菜汁液。苗期多密集于叶背和心叶危害,致使叶片产生黄绿色斑点,而后皱缩卷曲,生长发育迟缓,甚至全株枯死。油菜抽薹开花后则多聚集在花梗上进行危害,使花梗发育畸形,花色变暗,角果发生异常。蚜虫是油菜病毒病的传播者,病毒病造成的损失往往比蚜害本身还重。2.菜青虫:初龄幼虫仅食叶肉,被害叶片出现透明小
Rape from emergence to maturity are susceptible to aphids, Pieris rapae and yellow strip leafhopper three pests harm the damage of rape seedlings is weak, the decline in production and quality, weight is the whole plant died. Targeted measures to strengthen the comprehensive control of pests is to ensure that the rapeseed yield key link. First, the hazards of symptoms and characteristics 1. Aphids: As aphids and if aphid thorn suction rape juice. Seedling more dense in leaf back and heart leaf damage, resulting in yellowish green leaf spots, and then crimp curling, growth retardation, and even the whole plant died. After rape bolting flowering is more gathered in the pedicel on the hazards of malformations, deformities, color darkening, Kok abnormalities occur. Aphids are communicators of the rape virus disease, and the losses caused by viral diseases are often more severe than the pest itself. 2. Pieris rapae: the first instar larvae only eat the leaves, the victim leaves appear transparent small