广东桐花树群落上的柑橘长卷蛾研究

Study on Homona coffearia in Mangrove Community of Aegiceras corniculatum in Guangdong Province

柑橘长卷蛾是红树林桐花树群落的重要害虫，在广东省局部区域的红树林保护区，已经对桐花树造威严重危害、对秋茄造成危害。柑橘长卷蛾在桐花树1年完成6代，以中龄幼虫越冬，第1～5代虫历时38～58d，越冬代虫历时130～137d。在桐花树群落，幼虫危害嫩芽、叶片、花序和果实；在桐花树＋秋茄群落，幼虫危害秋茄的嫩芽和嫩叶片。在桐花树群落，5月上旬-5月下旬和9月上旬～10月上旬，受害嫩芽数量与受害叶片数量有两个高峰期，柑橘长卷蛾种群数量消长规律与受害嫩芽与受害叶片数量的变化规律成正相关，柑橘长卷蛾种群数量全年也对应有两个高峰期，但秋季害虫高峰期害虫的总数量只有春季暴发期害虫总数量的29％。柑橘长卷蛾数量与捕食性蜘蛛数量的比例为1：0．33，林间捕食性蜘蛛数量的比例偏低。

Homona coffearia is important pest insects on community of mangrove Aegiceras corniculatum, in the part field of mangroves in Guangdong, the pests had already seriously harmed on A. corniculatum, and harmed on Kandelia obovata. In A. corniculatum, H. coffearia can complete 6 generations in one year, they live through the winter with the middle-larva, the period from the first generation to fifth generation need 38 - 58 d, the period of living through the winter needs 130 - 137 d . On the community ofA. corniculatum, the larvae harm twigs, leaves, anthotaxy or fruits, on the community A. corniculatum ＋ K. obovata, the larvae harm twigs, and tender leaves of K. obovata. On the community of A. corniculatum, during May and between the first ten days of September and of October, there are two high periods of amounts of harmed twigs and harmed leaves, the numbers of H. coffearia is positively related to the numbers of harmed twigs and leaves. On A. corniculatum community, there are two high periods of breaking up of pests in one year： the autumn and the spring, but the number of pests in autumn is 29% of in spring. In forests, the number of predaceous spiders is less, the proportion of number of H. coffearia and spiders isl： 0.33.