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茶角胸叶甲(Basilepta melanopus Lefenre)是我国南方部分茶区近年来新成灾的一种重要茶树害虫。成虫咬食茶树嫩梢芽叶,幼虫取食茶树根系,对茶叶产量、品质影响极大。此虫在湖南一年发生一代,以幼虫在土中越冬。次年四月下旬越冬幼虫化蛹,五月上旬成虫始见。成虫危害茶树期长达两个多月,高峰期在五月中旬至六月中旬。田间雌雄性比约为1:0.6,每雌可产卵60-100粒,卵产在茶园表土层或枯枝落叶下。成虫发生期与早春气温紧密相关,田间发生量与茶树长势、品质及茶园土质有关。主要天敌有三种步甲、一种蠼螋和两种蚂蚁。叶面施药毒杀成虫,防治适期可定在成虫开始羽化后10-15天,喷用20%速灭杀丁或2.5%敌杀死3.000-4.000倍,50%马拉松500-800倍,80%敌敌畏800倍液均有较好的防治效果。
Basilepta melanopus Lefenre is one of the most important tea tree pests in recent years in some tea areas in southern China. Adults bite the shoots of young shoots of tea, larvae feeding the roots of tea, tea yield, quality great influence. This pest occurs in Hunan one year and overwinters with larvae in the soil. The following year in late April overwintering larvae pupae, adult early May see. Adults endanger the tea tree period of up to two months, the peak in mid-May to mid-June. Field male and female ratio of about 1: 0.6, 60-100 eggs per female can spawn, egg production in the tea plantation or litter below the surface layer. The incidence of adult worms is closely related to the temperature in early spring. The occurrence in the field is related to the growth of tea trees and the quality of tea gardens. The main natural enemies are three kinds of carabiners, a slug and two kinds of ants. Foliar application poisoning adults, control may be set at the appropriate period of adult emergence of 10-15 days after emergence, spraying with 20% speed kill Ding or 2.5% enemy kill 3.000-4.000 times, 50% marathon 500-800 times, 80% dichlorvos 800 times have better control effect.