基因组学与应用生物学

通过系统调查和室内试验,明确了国营广西浪湾华侨农场和南宁市郊柑桔园中食螨瓢虫种类主要有广西食螨瓢虫、黑囊食螨瓢虫和越南食螨瓢虫等3种,其中以广西食螨瓢虫、黑囊食螨瓢虫为优势种。两优势种瓢虫在当地一年可发生9～10代,成虫的寿命最长达105天,每头雌虫一生平均产卵最多达117粒。成虫、幼虫均能捕食柑桔红蜘蛛,每头日捕食量与叶螨密度有关,密度越大捕食量越多。食螨瓢虫田间种群数量变动与食料和使用化学农药情况有关,红蜘蛛少或用药多的果园,常无这类瓢虫。

The results of field investigation and laboratory experiment showed that the Stethorus guanxiensis and S.aptus are the predominant natural enemies of citrus mites in citrus orchards of Langwan Oversea Chinese Agricultural Station and suburb of Nanning.Both of these two coccinellids developed 9～10 generations per year.The maximum longevity of their adult is 105 days.Each female could lay27～117eggs.The adults and larvae of these two coccinellids prey upon immature and mature citrus mites.The daily preying quantity is varied in relation to the host population.The host in higher density may be captured much more.These coccinellids are lack or less occurred in the field where the host density is lower or spraying pesti- cides frequently.