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柑桔四斑黄叶螨为害柑桔、桃及葡萄等果树。目前已知分布于广西、江西及四川。此外,湖南、湖北、浙江、广东、福建、云南等省,均有柑桔黄叶螨为害的报导,但名称不一是否同种,尚待考查。在四川一年内,以4—5月间发生最猖獗,造成大量落叶,严重的引起落花、落果,影响产量和树势。 据四川省武胜园艺场1955年观察,认为柑桔四斑黄叶螨每年繁殖起于初春,盛于初夏,至6月下旬,虫口密度大为减少。在防治上,证明3月上旬开始喷药,可收到很好的效果。据浙江黄岩柑桔研究所1958年2月间药效测定结果,0.5％蒽油乳剂对黄叶螨的成虫及卵均有良好的效果。1961—1963年在本所实验农场(重庆、北碚)的研究,初步明确该虫的生物学特性及其消长规律,肯定了3—4月是其防治的关键时期。并初步调查了寄主、天敌种类。进行了数种杀螨剂的药效测定。现将结果整理报导于下。
Citrus yellow spotted spider mite damage citrus, peach and grape and other fruit trees. Currently known to distribute in Guangxi, Jiangxi and Sichuan. In addition, Hunan, Hubei, Zhejiang, Guangdong, Fujian, Yunnan and other provinces, have reports of citrus yellow spider mite damage, but different names are the same species, pending examination. Within one year in Sichuan, the most rampant occurred in April-May, causing a large number of deciduous leaves and seriously causing falling and falling fruit, affecting output and tree vigor. According to the observation of the Wusheng horticultural field in Sichuan Province in 1955, it is believed that the annual reproduction of Tetranychus urticae from Citrus begin with early spring and prevails in early summer. By the end of June, the population density of pest mouth has been greatly reduced. In the prevention and control, to prove early March spraying, can receive good results. According to Zhejiang Huangyan Citrus Institute in February 1958 measured the efficacy of the results, 0.5% anthracene oil emulsion on the spider mite adults and eggs have a good effect. From 1961 to 1963 in our laboratory farm (Chongqing, Beibei) research initially identified the biological characteristics of the pest and its growth and decline, affirmed the 3-4 months is the key period of its prevention and control. And preliminary investigation of the host, natural enemies. The efficacy of several acaricides was tested. The results are now reported below.