茶毛虫的防治指标

茶毛虫（ＥｕｐｒｏｃｔｉｓｐｓｅｕｄｏｃｏｎｓｐｅｒｓａＳｔｒａｎｄ）是我国茶树主要害虫之一．本文测定了幼虫取食量、取食嫩叶和成叶的比例，并进行人工摘除成叶模拟茶毛虫取食成叶对产量影响的试验．结果表明：茶毛虫幼虫的平均取食量为１４６８．９ｍｇ，第１、２、３代幼虫取食嫩叶占取食总量的比例分别为６７．２３％、５８．９６％、６４．９２％；根据防治费用、茶叶产量、茶叶价格、幼虫存活率和防治效果的调查，每公顷年产干茶２２５０ｋｇ的茶园，第１、２、３代茶毛虫的防治指标分别为９１４００、３２０７００、１６３９００头ｈｍ－２；每公顷年产干茶１５００ｋｇ的茶园，第１、２、３代茶毛虫的防治指标分别为７３１００、２５６６００、１３１１００头ｈｍ－２．

The action threshold of tea caterpillar

Tea caterpillar (Euproctis pseudoconspera Strand) is one of the major pests of tea bushes. Investigations on larval feeding amount and the feeding proportion of the tender leaves and the mature leaves to the feeding amount, and the simulation experiment on the effect of picking the mature leaves on the tea plantation were conducted. Results indicated that the mean total feeding amount of tender and mature leaves per larva was 1 468.9 mg, 67.[KG-4]23% of the amount was tender leaves in the first generation and 58.96% in the second generation, 64.92 % in the third generation. According to the investigations on survival rate of larvae, cost and effect of control, and, output and price of tea, the action threshold was determined as 91 400 larvae per hectare for the first generation, 320 700 for the second generation, 163 900 for the third generation in the plantation with the annual output of 2 250 kg made tea per hectare, and as 73 100 larvae per hectare for the first generation, and 256 600 for the second, 148 600 for the third in the plantation with the annual output of 1 500 kg made tea per hectare.