加州新小绥螨对朱砂叶螨不同螨态的捕食选择性及与拟长毛钝绥螨功能反应比较

Preference of Neoseiulus californicus(Acari:Phytoseiidae) and Functional Responses of N. californicus and Amblyseius pseudolongispinosus to Prey Developmental Stages of Tetranychus cinnabarinus

加州新小绥螨是世界商品化品种,近年在国内首次发现。本文在25℃,RH(80±5)%,光周期16L:8D的条件下研究了加州新小绥螨雌成螨对朱砂叶螨3种螨态(卵、幼螨及若螨)的捕食喜好性,并与拟长毛钝绥螨对朱砂叶螨的功能反应进行了比较。结果表明,相对于朱砂叶螨卵(Ci为-0.09)与幼螨(Ci为-0.07),加州新小绥螨更喜食若螨(Ci为0.06)。当朱砂叶螨卵密度高于20粒时或若螨密度高于15头时,加州新小绥螨的捕食量显著高于拟长毛钝绥螨。两种捕食螨对朱砂叶螨3种螨态的功能反应均为HollingⅡ型,加州新小绥螨对朱砂叶螨3种螨态控制能力(a'/Th值)均强于拟长毛钝绥螨。加州新小绥螨对朱砂叶螨卵、若螨的理论最大捕食量分别比拟长毛钝绥螨的高出35.0%、37.1%;对幼螨的理论最大捕食量仅比拟长毛钝绥螨低8.0%。

The predatory mite, Neoseiulus californicus(Mc Gregor), was recently recorded in China. The previous experiment showed that N. californicusis had high consumption rate and high fecundity when feeding on spider mites. Preference in N. californicus for prey stages of spider mite Tetranychus cinnabarinus was studied in laboratory at 25 ℃, RH(80±5)%, and a 16L:8D photoperiod. Functional responses of N. californicus and Amblyseius pseudolongispinosus to the spider mites were also measured. N. californicus preferred nymph to larva of the spider mite, egg was the least preferred stage. When prey density was more than 20 eggs or 15 nymphs, N. californicus preyed significantly more than A. pseudolongispinosus did. Functional responses of the two predatory species on each prey stage(egg, larva or nymph) could be described by the HollingⅡ type. Suppression(a'/Th) of the three prey stages was greater by N. californicus than by A. pseudolongispinosus. When eggs or nymphs of T. cinnabarinus were used as prey, the daily maximum theoretic number of consumed prey in N. californicus was 35.0% or 37.1% more than that in A. pseudolongispinosus, but 8.0% lower when larvae of spider mites were supplied. The results suggest that N. californicus may be a potential biological control agent against the spider mite.