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泽兰实蝇(Procecidochares utilis)是恶性杂草紫茎泽兰(Eupatorium adenophorum)的一种重要天敌,于1984年8月从西藏引至昆明。对杂草天敌国外多采用引种释放试验证明后直接释放,一般不进行室内大量人工繁殖。由于泽兰实蝇只产卵于紫茎泽兰茎顶端一对未展开的心叶之间,在植物开花期,适于产卵的枝条甚少,常导致田间泽兰实蝇种群数量下降;同时也为大量繁殖泽兰实蝇带来困难。泽兰实蝇寄主专一性试验表明,泽兰实蝇只能在紫茎泽兰上寄生。这样,在2～5月份紫茎泽兰盛花期必需有足够数量的寄主植物才能保证繁虫工作的正常进行。为解决这些问题,开展了有关试验研究,初步结果整理于后。
Procecidochares utilis, an important natural enemy of the malignant weed Eupatorium adenophorum, was introduced from Tibet to Kunming in August 1984. The natural enemies of weeds more introduction of release test proved directly released, generally do not carry out a large number of artificial indoor breeding. Because Zealotia spawn only between a pair of untreated heart lobes at the top of the stem of Eupatorium adenophorum, the number of suitable spawning branches is low at the flowering stage of the plant, which often leads to a decrease in the population of Zealid fruit fly in the field. At the same time, it also brings difficulties to the breeding of Zealfly. The test of host specificity of Zeeland flies shows that Zeeland flies can only parasitize Eupatorium adenophorum. In this way, from February to May Eupatorium flowering must have a sufficient number of host plants in order to ensure the normal work of bug. To solve these problems, carried out on the pilot study, the initial results after finishing.