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Bionomics of Tussock moth Porthesia similis (Fueszly) and its Control

Dai Yanhai(Zhangzhou City Forestry Bureau of Fujian Province, 363000)  
The tussock moth porthesia simitis (Fueszly) is a serious pest of Acacia mearnsii in Fujian Province. It has three generations a year and overwinters as larvae. The eggs are laid on the branches and to be hatched within 5 ~ 10 days. The larvae generally have five instars and usually feed on the tender leave.When the larvae become mature, the larvae descend to the ground and spin their cocoons in the thick growth of grass or the fallen leaves. The pupal stage lasts 5~10 days. A female lays 254~632 eggs. Our experiments showed that the following control measures were effective: spraying 90% Dipterex emulsion in concentrations 1. 0/L, 80% DDVP emulsion in concentrations 0. 5g/L on 20% Pydrin emulsion in concentrations 0. 125g/L.
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