纵坑切梢小蠹蛀梢期生物学研究

STUDIES ON THE BIOLOGY OF TOMICUS PINIPERDA (COL.,SCOLYTIDAE ) IN THE SHOOT-FEEDING PERIOD

本文研究了纵坑切梢小蠹Ｔｏｍｉａｕｓｐｉｎｉｐｅｒｄａ对云南松枝梢的危害，并对该虫在蛀梢期的有关生物学特性，如性比、交配、食物选择、卵巢发育、越冬等进行了探讨。在昆明地区，蛀梢期从当年５月持续到次年３月。在此期间，该班平均可蛀害３～６个枝梢。受害梢以当年生枝梢为主，平均直径为７～８．５ｍｍ。同一枝梢可受到多次蛀害。侵入孔距枝梢末端约３～４ｃｍ。该虫在蛀梢期已开始交配活动。交配率随卵巢发育进度而增大。各虫态受冬季气温低的影响发育减缓，但均能顺利越冬。

This paper deals with the injuries caused by Tomicus piniperda to theshoots of Pinus yunnanensis in shoot-feeding period in Kunming region of China.Information on its biological characterisfics including sex ratio, mating, feeding preference and habit,hibernating and ovary development is presented and discussed.The shoot-feeding period in Kunming started during May and lasted to Marchthe next year,in which each beetle bored 3 to 6 shoots.Most damaged shootswere the current shoots with 7-8.5mm diameter. The same shoot could bedamaged several times,but frequently two times.The entrance hole was about3-4cm far from the shoot tip.Mating was observed during shoot-feeding andthe mating rate increased progressively with ovary development.The developmentduring the winter season slowed down due to low temperature.Successfulhibernation was observed for all stages.