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Notes: Distribution of L. salicina on their hosts is discussed. The death rate was high in hot summers and severe winters. Investigation of the relationship between the occurring area of oyster scale and meteorological factors such as humidity and temperature in ten cities and counties in Heilongjiang province formed a multiple linear regression model for the prediction of the occurring area of oyster scale. Acarids, ladybeetles, parasitic wasps and parasitic flies were found to be natural enemies.