茶黑毒蛾防治指标的研究

Study on the Control Index of Tea Black Tussock(Dasychira baibarana Mastumura)

茶黑毒蛾 Dasychira baibarana Matsumura 是茶树的一种主要害虫。本报告通过对幼虫取食量、取食嫩叶和老、成叶的比例及田间摘除老、成叶后对产量影响的模拟试验结果表明,茶黑毒蛾幼虫的平均取食量为1710.4毫克,越冬代幼虫取食嫩叶占总量的78.33%,第1代幼虫占20.98%。越冬代幼虫的危害嫩叶当量 D=0.00134公斤,第1代幼虫虫量与产量损失的关系式为(?)=0.0001377x^(1.247)。根据防治总费用、茶叶产量、价格及防治效果的调查,每亩年产150公斤干茶的茶园,越冬代幼虫的防治指标为2900头,第1代为4500头;年产100公斤干茶的茶园,越冬代幼虫的防治指标为2300头,第1代为3700头。

Tea black tussock(Dasychira baibarana Mastumura)is one of the majorpests on tea bushes.Investigation on larval food ingested amount and thefeeding proportion of the tender leaves to the old and mature leaves andsimulated experiment on the effect of picking the old and mature leaveson the yield of tea were conducted.Results indicated that the mean totalingested amount of tender and old leaves per larva was 1710.4 mg,78.33%of the amount was tender leaves in overwinter generation and 20.98% inthe first generation.The larval injury equivalency of the overwintergeneration was 0.00134 kg per larva.The empirical equation between theloss of yield(y)and the number of larvae(x)at the first generation wasdrawn as y=0.0001377x^(1.247).According to the investigations on controlcost,tea yield,tea price and control efficacy,the control index wasdetermined as 2900 or 4500 larvae per mu of the overwinter or first genera-tion for the tea plantation with the annual output of 150kg made teaper mu,and as 2300 or 3700 larvae per mu for the plantation with theannual output of 100kg made tea per mu.