A STUDY ON THE MOTH BORER (ZEUZERA MULTISTRIGATA MOORE) (LEPIDOPTERA:ZEUZERIDAE)

A study on the Zeuzera multistrigata Moore was made in Fujian Province from 1982 to 1987.This kind of moth borer damages tree trunk.It is one of primary pests in the Casuarina equisetifolia Linn, in the shelterbelt along the coast of Fujian.The pest has one generation a year.It overwinters within the galleries in the larvae form.The adult emerges from the mid-May to early September the next year and lays eggs in beneath the bark.New hatched larvaes are thrown about by wind and bore holes at the edge of buds.The male mothes can be attracted by light;the female mothes have sex pheromones.If the crown density is over 0.7 or the age of the stand is over 10 years, the trees could be hardly damaged.The mixed forest is damaged less than pure forest.Natural enemies of the borer amount to more than eight species.If we spurt Beauveria bassiana (5×108-108/ml) into the burrows on the trunk, more than 86.7% of the old larvaes of Z.multitrigzta can be killed.In the early boring stages, to spray the edge of buds with 2.5% of Decamethrin in a concentrations of 1:3000 or 40% Omethoale in 1:300 is effective in killing the new larvaes.