小黑瓢虫的交配和产卵行为及规律观察

通过室内观察,研究了小黑瓢虫Delphastus catalinae交配、产卵的行为及规律,并探讨了交配次数对成虫繁殖力的影响。结果表明：雄虫的交配前期为5.0±0.5d,雌虫的产卵前期为5.8±0.4d;小黑瓢虫交配活动的主导者是雄虫,雄虫性成熟后可进行交配;性成熟的成虫可全天交配,交配持续时间平均为18.6min,6：00-8：00为高峰时刻;雌虫交配后可全天产卵,白天产卵量高于夜间,每雌可产卵353~413粒,产卵期63~120d;交配次数的增加可以延长产卵期,提高小黑瓢虫的产卵量,但雌虫的寿命会下降;交配多次的后代繁殖状况最佳。

Mating and Oviposition Behaviors and Rhythms of Delphastus catalinae(Horn)

Mating and oviposition behaviors and rhythms of Delphastus catalinae（Horn） were observed,and the influence of mating frequency on fecundity was investigated.Results showed that mating was a male-dominated phenomenon.When sexually mature,the males initiated mating.A complete mating process took 18.6 min on average.A pre-mating period of 5.0±0.5 d for the male and a pre-ovipositing period of 5.8±0.4 d for the female were observed.Multiple mating occurred during the whole day and peaked in the early morning at 6：00-8：00.After mating,female adults laid more eggs during the day than at the night.Oviposition lasted 63120 d with 353-413 eggs laid per female.With the increase of the mating frequency,oviposition period and fecundity increased but longevity of female decreased. Multiple mating added to the reproductive performance of D.catalinae.