芬兰真绥螨生物学特性的研究

芬兰真绥螨是甘肃省东部地区果园捕食螨的优势种，一生有卵、幼螨、前若螨、后若螨和成螨5个生育阶段，在T＝25±0.5℃,RH=80±5%和苹果全爪螨幼若螨为食料时，其卵期45.4h，幼螨期34.7h，前若螨期29.6h，后若螨期27.64h，实验种群雌成螨的平均寿命32.67d，雌雄性比68：32，单雌产卵量47.7粒。对山楂叶螨、苹果全爪螨卵的最大理论捕食量分别是71.11粒和57.14粒；对其幼若螨的最大理论捕食量分别为3.96和30.67头。对山楂叶螨卵和幼若螨的捕食作用的功能反应方程分别是：Na=N／0.6133+0.0141N和Na=N／2.2165+0.2527N。对苹果全爪螨卵和幼若螨的捕食作用的功能反应方程分别是：Na=N／2.1538+0.0175N和Na= N／1.2264+0.0326N。在T＝25±0.5℃,RH=80±5%、以山楂叶螨幼若螨、苹果全爪螨幼若螨和卵为食料时，芬兰真绥螨实验种群的内禀增长力(rm)分别是0.1 299、0.1 793和0.0 958。

Study of biological character of Euseius finlandicus (Oudemans)

Euseius finlandicus (Oudemans) is one of dominant predatory mite in the east of Gansu province. Results of interrelate research showed that E. finlandicus undergoes 5 developmental stages: egg, larva, protonymph, deutonymph and adult. Developmental characteristics of the mite in different stages under the condition with the temperature (T) of 25±0.5℃ and the relative humidity (RH)of 80±5% and reared with the larvae and nymphae, showed as follows: Length of egg period was in 45.4h, larva in 34.7h, protonympha in 29.6h, deutonympha in 27.64h, and life period of adult was in 32.67d, ♀／♂＝68／32，number of oviposition was 47.7 eggs/♀. The equations of predatory function of E. finlandicus to the eggs and immature mites of Panonychus ulmi under the conditions were Na=Nt / (2.1538+0.0175Nt) and Na=Nt/ (1.2264+ 0.0326 N) respectively. The equations of T. viennensis and under the conditions T=24.6℃(24-26℃) and RH=65.7% were Na=N／0.6133+0.0141N and Na=N／2.2165+0.2527N respectively. The study of the intrinsic rate for increase (rm) of the E. finlandicus under the conditions with T=25±0.5℃，RH=80±5% and reared with the immature mite of T.Viennensis and P. ulmi showed that the intrinsic rate for increase (rm) 0.12PP/day and 0.1793/day recpectively. Under the condition for the T and the RH, but reared with the eggs of P. ulmi, the parameters of the population gained: rm=0.0958.