次黄筒天牛生物学特性及卵的空间分布研究

BIOLOGICAL CHARACTERS OF YELLOW MULBERRY TWIG BORER AND SPACE DISTRIBUTION OF ITS EGGS

次黄筒天牛在江苏太仓1～2年发生一代，幼虫在枝干内越冬，成虫6月上旬～7月中旬羽化，取食桑树的嫩叶、叶脉，产卵于桑树新梢端部。卵期13d，幼虫蛀入枝条，先向上蛀食到梢端再调头向下蛀食，枝条短的幼虫可入拳越冬，第2年5月中旬化蛹，蛹期约16d。被害株有效条数降低，影响产叶量。该虫卵的空间分布为聚集型。个体间相互吸引但聚集强度不高，并在此基础上提出了序贯抽样模型。

Yellow mulberry twig borer, Oberea infratestocea Pic, is a mulberry pest found in Jiangsu Province recent years. Its life cycle takes one to two years in Taicang area. Larvae overwinter in mulberry shoots and pupate in middle May nest year. The pupal stage lasts about 16 days and the emergence takes place in middle June to middle July. Adults feed on tender leaves and lay eggs on the top of twigs. The eggs hatch in about 13 days and the larvae bore and feed into shoot and overwinter inside it. The space distribution of the eggs is in patchy pattern with lower intensity. Based on the above results,sequential sampling model is proposed.