马尾松古松叶蜂的研究

马尾松吉松叶蜂（ＧｉｌｐｉｎｉａｍａｓｓｏｎｉａｎａＸｉａｏ）属松叶蜂科Ｄｉｐｒｉｏｎｉｄａｅ，是危害马尾松的一种新害虫，近年来在安徽滁县沙河集林业总场发生相当严重。经研究，此虫一年发生２代，以预蛹越冬。该幼虫的空间分布型为聚集分布，我们编制了“马尾松吉松叶蜂地面茧数”查定表；制定了防治指标；其防治适期为２—３龄幼虫出现高峰期：第１代为５月１５－３０日；第２代为１０月１０—２５日。以２．５％溴氰菊酯乳油２０００—５０００倍液等进行喷雾防治，效果均在９４％以上；以２．５％溴氰菊酯乳油等加柴油配成油烟剂进行喷烟防治，效果在９６％以上。

STUDIES ON THE BIONOMICS OF GILPINIA MASSONIANA AND ITS CONTROL

The sawfly, Gilpinia massonianais a newly discovered destructive insect to Pinus massoniana Lamb in Chu Xian county Anhui Province. It has two generations per year and overwinter under litter layer as prepupae in cocoons;until next April it emerges into adult. The larvl stage is about 31-54 days,pupal stage 8 -11 days and adult's lift-span about 8-12 days. The eggs are laid individually in pine needle and hatch after 10-13 days, The sex ratio of the adults is 0.52-0. 48. Spetial pattern of larvae is aggregation distribution, and the total amount of pine needle eaten by the larvae is 2. 3g. The sampling method of cocoons is N = B(1.4221x-0.3518), N is total number of cocoons under each tree crown, B is number of cocoons within lm of tree crown from the base of the tree to the periphery of perpendicuar projection of tree crown, xmean size of tree crown. Because the body surface of the 4th instar larvae are covered with a thin large of white wax, it is effective to control 2-3 instar larvae with a smoke generating formulation of diesel oil 2.5% diecise or 20% Shamiejuzhi in mid-May and October.