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在北方,危害桃树的蚧壳虫主要有三种,桑白蚧、杏球蚧和槐枝坚蚧。其中槐枝坚蚧发生范围广、传播快、危害重。槐枝坚蚧,又叫东方盔介壳虫,在林木树种中主要危害刺槐,在北方果树树种中主要危害桃、杏、葡萄等。该虫发生严重的情况下会使树体衰弱,小枝干枯,中晚熟品种果实果个小,口味淡,表面呈黑雾状。槐枝坚蚧在华北一年发生1—2代,以小若虫在枝条裂缝,粗皮下,芽子基部等处越冬,在唐山越冬苦虫3月下旬—4月上旬,桃芽刚萌动(鳞片松动露白)时陆续出蛰活动,
In the north, three pests of scale insects endanger peach trees, mulberry white scales, apricot coccids and acacia branches scale. Among them, Acacia crassipes occur in a wide range, spread rapidly and endanger heavy. Acacia branches scale, also known as the East Helmets scale insects, tree species in the main hazards Robinia pseudoacacia, the main fruit trees in the northern peach, apricot, grape and so on. Severe cases of the worm will make the body weak, dry branches, late-maturing varieties of fruit a small, light taste, the surface was dark mist. Locusta chinensis occurs in North China one to two generations a year in order to small nymphs in the branches of cracks, rough skin, bud base at the winter, bitter over in winter in Tangshan in late March to early April, peach bud just adventitious Lu Bai) when one after another sting activities,