【摘要】 利用澳洲瓢虫防治吹绵蚧,在国外已有70多年的历史,防治效果显著,我国引入澳洲瓢虫后,在防治上亦取得很好的效果。据我们室内饲养结果,一年发生8代,完成一世代的历期19—229天,平均56.26天。每雌虫产卵5—612粒,平均产卵173.82粒,卵孵化率为30.55—99.42％。过冬的成虫于3月上旬大量产卵,3月中旬出现产卵高峰,第一代成虫于4月下旬出现。澳洲瓢虫在重庆地区防治吹绵蚧的有效期为3—11月。成虫抗药力最强,卵次之,幼虫最差。在生物防治区,当澳洲瓢虫与吹绵蚧的虫口比例为1:15左右时,经14—20天后,吹绵蚧便被消灭。从放虫的日期起,约经55—69天,可将全国内的吹绵蚧消灭。更多还原

【Abstract】 The Australian ladybeetle (Rodolid cardinalis), a predator of the cottony cushionscale, was introduced to South China from the Soviet Union in the year 1955, and tothe vicinity of Chungking in 1960. It was a great success in the control of the cottonycushion scale. Our studies were chiefly on the life history of the Australian ladybeetleand its tolerance to some insecticides. In the vicinity of Chungking, it overwintets in the adult stage. There may be7--8 generations in the course of a year, when it is bred in the insectary, and the ge-nerations are overlapping in the fields. The longevity of the female and male adultis 16.03--103.07 days and 10.00--46.30 days respectively. On an average, from 119.73to 329.43 eggs are laid by each individual (female) in the different generations, themaximum of a single female being 612 eggs, and the eggs require from 2.85 to 12.27days to hatch. The larval stage lasts 5.77 to 24.23 days, and the pupal stage lasts 3.30to 14.13 days. The difference between the lengths of the stages of different generationschiefly depends upon the temperature. Our studies indicate that, 0.26--2.50 and 0.40--2.15 cottony cushion scale can beeaten daily by the ladybeetle larva and the adult respectively. Insecticide tolerance experiment in the laboratory showed that the adult ladybeetleand eggs were much more resistant to the insecticides than the larvae. The 0.10%D.D.T. emulsion or 0.047% E-605 emulsion was harmful to the adults, larvae and eggs;0.03% γBHC emulsion or 0.3--1.0° Be lime-sulphur was harmful to the larvae, andless harmful to the adults and eggs, but 0.05% Dipterx was safe to the ladybeetle atany stage.更多还原