摘要
荔枝瘿螨在南宁地区每年出现二个虫口高峰,第一个高峰在5～6月;第二个高峰在9～10月。其为害引起落花、落果,着果率降低,被害枝着果率仅为健枝的42.4%,受害果重量减少10%～16%。新梢未萌发之前,螨体大部分集中在被害梢毛瘿内,其中又以鲜褐色毛毡螨量最多,其次为褐色毛毡。过冬瘿螨多群集在被害的夏梢及秋梢毛毡上。当新梢萌发刚露白时,瘿螨即从被害梢毛毡转移至新芽上。基于这一习性,在荔枝树未发新芽前剪除害梢是防治该螨的有效方法,较适合于幼树。药剂防治最好在新梢萌发时进行。
In Nanning,the occurrence of litchi gall mite(Eriophyes litchi)shows two pronounced peaks annually.The first peak is predominant from May to June in summer while the second from September to October in autumn.The infestion by the pest causes falling down of flowers and fruits,fruitsetting rate lowered.The fruiting rate in the infested branches is only 42.4% as much as that in the healthy ones.The weight of infested fruits is 10%-16% lower than that of the healthy ones.Before sprouting, most of the mites gathered in the shaggy galls of the infested shoots with the most in the fresh brown carpet followed by the brown carpet.Most of the wintering gall mites are flock together in the carpet of summer and autumn shoots.They move to the young shoots while sprouting.Based on the habits of litchi mites,one of the effective control measure for young trees is to remove the infested shoots before new shoots occur.It is the best time for pesticide control when the trees are sprouting.
关键词
荔枝
瘿螨
防治
为害
Eriophyes litchi
habit
yield loss
control measure
pruning
