赤眼蜂对不同基质的玉米螟卵的寄生选择性

Studies on the Parasitic Selectivity of Trichogramma to Different Basements Material of Asian Corn Borer Eggs

采用硫酸纸、塑料布、鲜玉米叶、蜡纸作为玉米螟成虫的产卵基质,得到4种不同的玉米螟卵块。在气候箱内对大、小卵繁殖的4个品系赤眼蜂进行寄生玉米螟卵块测试。结果表明:4个品系赤眼蜂对4种不同基质玉米螟卵的寄生具有选择性,不同品系赤眼蜂对同一种玉米螟卵的寄生特性存在差异,小卵赤眼蜂的寄生特性优于大卵赤眼蜂,当蜂种同为"大卵"或同为"小卵"时,螟黄赤眼蜂的卵块寄生率优于松毛虫赤眼蜂,而松毛虫赤眼蜂的单雌寄生卵粒数优于螟黄赤眼蜂;研究还发现同一赤眼蜂品系在玉米叶卵上的寄生效果最好,其次是塑料布卵,很少在蜡纸卵上寄生,这一结果为今后更好地选育、应用,以及效果评价赤眼蜂提供参考。

Four kinds of Asian Corn Borer（ACB） eggs masses were obtained by using basements material includevegetable parchment, nontoxic plastics cloth, fresh maize leaves and mimeograph paper. Parasitic characters of fourTrichogramma strains on different ACB eggs were studied in artificial climate box. The results showed that parasiticof Trichogramma to four kinds basements material of ACB eggs had selectivity. Lay and parasitic characters of differ-ent Trichogramma strains to the same ACB eggs were significantly different. Parasitic characters of small eggsTrichogramma was better than those large eggs Trichogramma. When species and strain of Trichogramma was largeeggs or small eggs only, the egg masses parasitism rate of T. chilonis was better than that of T. dendrolimi, but thenumber of eggs laid per female of T. dendrolimi was better than that T. chilonis. It was found that lay and parasiticeffect of the same Trichogramma was best on ACB eggs masses of fresh maize leaves, next was on ACB eggs massesof nontoxic plastics cloth, and that was worst on ACB eggs masses of mimeograph paper. This conclusion offers foun-dation and reference for breeding and application effect evaluation of Trichogramma in the future.