降雨量对广西地区白蜡虫死亡及其种虫白蜡产量的影响

Study on the Mortality of the White Wax Scale Insect with Relation to Rainfall in Guangxi

在广西四县一市,比较了五个不同年降雨量和年平均气温对白蜡虫死亡及其种虫、白蜡产量的影响。结果表明,年平均气温对白蜡虫种虫的死亡影响不大;年降雨量则是引起白蜡虫种虫大批死亡的主要原因,每次大雨过后,即出现一个雌虫死亡高峰。雌虫比雄虫敏感,其上限为1552.5mm左右。在这个上限以下,雌、雄蜡虫均生长发育良好,死亡率低产蜡量高;反之,雌虫大批死亡,其死亡百分率随着年降雨量的增加而显著增加。雄虫虽不及雌虫敏感,但是,在雨量过多的情况下,蜡花也常常长霉变黑,间接致使雄蜡虫死亡,产蜡量很少。

A comparision investigation on the mortality of white wax scale insect in relation to rainfall and annual temperature in different years at four counties and one municipality in Guangxi Province has been carried out. The results show that the average annual temperature is a negligible factor on the insect's mortality, but the annual rainfall has been proved to be a causative factor. High mortality usually appears after every heavy rain, and the female insects are more susceptive to it than the males. The upper limit of annual rainfall is about 1552.5mm, under the level of which the insects of both sexes develop normally with low mortality. Under unfavorable conditions a high mortality would follow, the percentages of which varies with the annual rainfall of the year. The results also show that in excessive rainy days the male, though not so susceptible as the female to rain, and yet its wax encrustation will be mildewed and blackened, causing the final death of the insect.