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室内以人工卵和柞蚕卵为寄主,观察荔蝽卵平腹小蜂 Anastatus japonicus(简称平腹小蜂)和松毛虫赤眼蜂 Trichogramma dendrolimi(简称赤眼蜂)种间对寄主的竞争情况。实验表明:平腹小蜂寄生后两天内接赤眼蜂,在接蜂时间间隔为0天,一天和两天时,含赤眼蜂的寄生卵分别占53.66%、46.11%和47.20%;含平腹小蜂的寄生卵分别占27.09%、28.53%和23.08%;含两种蜂的寄生卵分别占19.25%、25.36%和29.72%。若两种蜂接蜂时间间隔为四天和八天时,含赤眼蜂的寄生卵分别降为15.79%和11.88%;而含平腹小蜂的寄生卵分别增加至48.35%和52.15%;含两种蜂的寄生卵比例也有所增加,分别占35.86%和35.15%。弱者不能完成发育而在出蜂前死亡,强者也难繁殖出正常的后代。实验室繁殖时应避免两种蜂混杂而降低出蜂质量。过寄生也会使平腹小蜂幼虫产生种内竞争现象,同龄幼虫以二龄期竞争最为激烈;不同龄期则因一龄幼虫行动活跃,利用长而硬的刺毛刺伤二龄甚至三龄幼虫而成为营养争夺的胜利者。过寄生虽然可以正常出蜂但已经造成寄生卵的浪费。生产实践中应控制正常的蜂卵比,减少这种现象产生。
Indoor artificial eggs and tussah eggs were used as hosts to observe the competition between hosts Anastatus japonicus and Trichogramma dendrolimi (Trichogramma dendrolimi). The results showed that Trichogramma was collected within two days after the parasitoid was parasitized, and the parasitic eggs with Trichogramma were 53.66%, 46.11% and 47.20% respectively at the one day and two days after the parasitic wasp; The parasitoid eggs of Apis mellifera accounted for 27.09%, 28.53% and 23.08% respectively, while the parasitic eggs with two bees accounted for 19.25%, 25.36% and 29.72% respectively. The parasitic eggs with Trichogramma were reduced to 15.79% and 11.88%, respectively, while the parasitic eggs with Trichogramma were increased to 48.35% and 52.15% respectively when the time interval between the two wasps was four days and eight days. The proportion of parasitic eggs of both bees also increased, accounting for 35.86% and 35.15% respectively. The weak can not complete the development and died before the bee, the strong hard to breed normal offspring. Laboratory breeding should avoid mixing two bees and reduce the quality of bees. Parasitism will also make the Baphicola minor larvae produce intraspecific competition, the same age larvae in the second-year competition is the most intense; different age due to the first-instar larvae are active, the use of long and hard barbed stab wounds two or even three Age larvae become victories in the fight for nutrition. Although the parasite can be a normal bee but has caused the waste of parasitic eggs. Production practice should control the normal ratio of bee eggs to reduce this phenomenon.