A PRELIMINARY STUDY ON THE OCCURRENCE REGULARITY OF THE DISEASE ON MYTILARIA LAOSENSIS CAUSED BY GALL MITE AND ITS CONTROL

Mytilaria laosensis in Daqingshan area of Guangxi is severely invaded by Gall Mite (Eriophyes sp.). The primary infection occurs during March-April, peak infection during August-October, and then it declines. The Mite overwinters mainly on diseased spots or on petioles. Leaf inoculation under an average temperature of 29℃ and a relative humidity of 85% indicates that the incubation period is about 4-5 days and infection percentage reaches 46.6-53.3%. Indoor tests of insecticidal chemicals show that 20% Dicofol, DDVP (1:1000-1500), etc. are effective. So are some insecticidal smokes.