作 者：
麦秀慧;李树新;熊锦君;郑德胜;黄明度;司徒金
摘 要：
在柑桔园种植一种菊科杂草——藿香蓟覆盖地面,对桔全爪螨的重要天敌纽氏钝绥螨有明显的助长作用。柑园覆盖藿香蓟后,在夏季高温季节,可使柑桔树冠外围温度从40～45℃降至35℃以下,相对湿度增加;藿香蓟的花粉可供作钝绥螨的食料。这种小生境的改善,有利于钝绥螨种群的稳定和增长。藿香蓟草丛中的生态条件适合钝绥螨的生存繁殖,钝绥螨在藿香蓟叶片上的密度,常比在柑桔叶片上为高。在需要使用化学农药防治其他害虫或病害而引致柑桔树上的钝绥螨数量明显减少时,藿香蓟上的钝绥螨是一个重要的补充源泉。藿香蓟的生长抑制了其他杂草,大大减少用于除草的劳动力。藿香蓟可作绿肥,根系较浅,无明显与柑桔争肥现象。经多年试验,证明上述方法防治桔全爪螨的效果良好,目前这种措施已在广东省的一些柑桔产区应用。对柑桔害虫的综合防治,可利用钝绥螨防治桔全爪螨,对其他重要害虫如桔锈螨、柑桔潜叶蛾和柑桔木虱可通过采取选择性农药防治或农业技术防治而加以控制。
译 名：
STUDIES ON THE RELATIONSHIP BETWEEN THE ECOLOGICAL FACTORS AND POPULATION OF PREDACEOUS MITE AND ITS UTILIZATION FOR THE CONTROL OF CITRUS RED MITE
作 者：
Mai Xiuhui Li Shuxin Xong Jinjun Zheng Desheng Huang Mingdu (Guangdong Entomological Institute)
Situ Jin (Bai Yin Farm, Guangzhou)
摘 要：
This study was conducted,on sweet orange,Citrus sinensis(L,),trees at Guangzhou district of Guangdong Province during 1979 to 1981.Effec- ttive biological control of citrus red mite,Panonychus cirri (McG.),by he polyphagous predaceous mite,Amblyseius newsarni Evans,is possible when the weed,Ageratum conyzoides Linn.,is growing in citrus orchards. Cultivation of the weed renders the environment of the orchard more favourable for A.newsami.This weed reduces the summer temperature of the air in the canopy of trees in orchards from 4o～45℃ to below 35℃,in- creases humidity,suppresses the growth of other weeds and provides food in the form of pollen for the predaceous mites,and also can be used as green manure.In the orchards where the weed was grown the hummer of A.newsami on the citrus trees reched 0.1～0.3 mobile stages per leaf and the citrus red mite population was maintained at low level.In the orchards which were free of such weed the number of predaceous mite on citrus trees was less than 0.1 mobiles stages per leaf.Population of pre- daceous mite was higher on the weed leaves than on the leaves of the cit- rus trees,generally exceeding 0.3 mobile stages per leaf.The higher po- pulation were related to the lower temperature and higher relative humi- dites recorded 10 cm above the ground within the weed growth than wi- thin the tree canopy. In order to carry out successful citrus pests control,the integrated use of predaceous mite with chemical and cultural control for other pests should be an effective measures.Dicofol with 0.025 percent active ingre- dient and colloidal sulphurs at rate of 1 to 500 water will kill more than 90 percent of citrus rust mite;carbaryl at 0.04 percent active ingredient will kill about 90 percent of citrus leaf miner and citrus psylla.These pesticides of above concentration have no harm to the predaceous mite.A. newsami This predaceous mite is sensitiye to organophosphates.
