油茶象甲形态特征及生物学特性研究

Study on the morphological and biological characteristics of Curculio chinensis

油茶象甲Curculio chinensis Chevrolat是油茶的重要果实害虫,为害严重林分果实被害率高达79.3%。本文详细描述了该虫的形态特征;对其生物学特性进行了研究,结果表明该虫在广东省2年发生1代,以老熟幼虫在土内越过第1个冬天、以初羽化的成虫在土内越过第2个冬天,4月上中旬开始出土,5-6月为出土盛期。成虫栖息环境、产卵和油茶果实的生长发育有密切的关系,成虫无交配时多栖息在油茶嫩枝、嫩芽或油茶果实基部的枯萎花絮上,成虫交配盛期多被发现在油茶果实上;油茶果实一般以果皮厚度4.0-6.0 mm着卵量最多,林间每果一般只有1粒卵或1头幼虫。

Curculio chinensis is a sever pest damaging Camellia fruit,the damaged rate of the fruit was as high as 79. 3% in serious forest. Morphological characteristics of the pest were detailed described;biological characteristics were researched,the result showed that the pest appeared one generation every two years in Guangdong Province,with old larvae over the first winter,with the beginning adult over the second winter,with adult coming in early April in the third year,adult occurred through May to June.There is a close relationship between the habitat,oviposition of the adult and growth of Camellia fruit： the adult habited in twigs,bud and wilt tidbits of fruit base during non mating; they habited on fruits surface during mating; the fruit had the maximum amount of eggs of the pests in pericarp thickness 4- 6 mm,there was usually one egg or one larva of the pest in every Camellia fruit in forest.