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- W2356572020 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." @default.
- W2356572020 created "2016-06-24" @default.
- W2356572020 creator A5091772023 @default.
- W2356572020 date "1963-01-01" @default.
- W2356572020 modified "2023-09-23" @default.
- W2356572020 title "A PRELIMINARY STUDY ON THE CONTROL OF COTTONY CUSHION SCALE BY AUSTRALIAN LADYBEETLE" @default.
- W2356572020 hasPublicationYear "1963" @default.
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