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在1950年以前,柑桔红蜘蛛Panonychus citri McG虽然在某些年份曾发生灾害,但是并不是一种年年为害的主要害螨;这种螨类上升为主要害螨是50年代后期在有机农药大量使用后才引起的。 近20年来,各地已先后使用了近20种农药来对付这种害虫,除柴油乳剂、洗衣粉及松脂合剂外,红蜘蛛都产生了抗性;到目前为止在四川、广东仍有些地区极少使用农药,红蜘蛛也很少有大发生的记录。 实验证明,红蜘蛛的大发生是由于滥施农药杀伤天敌引起的。 在广东及四川,植绥螨已被证明是红蜘蛛的主要天敌,常见的种类有德氏钝绥螨(Amblyseius deleoni M.et D),短毛钝绥螨(A.okinawanus E.),拉戈钟绥螨〔A.largocnsis(M.)〕纽氏钝绥螨〔A.newsami(E.)〕卵形钝绥螨〔A.ovalis(E.)〕四会钝绥螨(A.obtuserellus W.et B.),尼氏钝绥螨(Amblyseius nicholsi(E.et L.)及一种植绥螨(Phytoseius hawaiiensis P.),德氏钝绥螨是最常见的重要种类。由于世代历期短及繁殖快,在田间对红蜘蛛的控制能力很明显。 干旱对植绥螨及致病真菌芽枝霉(Cladosporium cladosporioides)的发生不利,因此对红蜘蛛的猖獗有利。 作者建议在果园边植林及间种绿肥以增加果园湿度,使有利于植绥螨及致病真菌的繁殖;使用对植绥螨杀伤力较小的选择性农药进行挑治;在有条件?
Prior to 1950, Panonychus citri McG, a citrus reddish spider, had been hit by some years but was not a major pest mite; it was the main pest mite that rose in the late 1950s in the late 1950s After a lot of use caused. Nearly 20 years, nearly 20 kinds of pesticides have been used around the country to deal with this pest. Apart from diesel oil emulsions, detergent and rosin mixture, the spider mites have developed resistance. So far in Sichuan and Guangdong, there are still few areas There are few records of spider mites using pesticides. Experiments show that the great occurrence of spider mites is caused by excessive use of pesticides to kill natural enemies. Phytoseiids have been shown to be the major natural enemies of spider mites in Guangdong and Sichuan Provinces. Common species are Amblyseius deleoni M. et D, A. okinawanus E., A. horgocnsis (A.) A. newsami (A.)〕 A. ovalis (A.) A. amblyseius W.et B., Amblyseius nicholsi (E. et L.), and Phytoseius hawaiiensis P. Aureus is the most common and important species, Short and rapid propagation, the ability to control spider mites in the field is obvious .Drought is unfavorable to Phytoseiidae and pathogenic fungi Cladosporium cladosporioides, so it is beneficial to spider mite rampant. And inter-species green manure to increase orchard humidity, so that it is conducive to the phytoseiidae and pathogenic fungi reproduction; the use of phytosexposure mites less selective pesticides to pick governance; conditional?