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The tree body invades through the different disease germ densitycondition under dyes with arises the situation experiment and in thedifferent chemical control apple tree rotten sick ward and the fieldtest, obtains the tree body the quantity which is invaded the germdyes and arises in the quantity and the orchard disease germ's howmany has the close relation and preventing and controlling apple treerotten sickness should vigorously promote spoiled must be clear, nextis 梧 rather the mildew element, should stop using the luckybeautiful arsenic.

Pathogens density through different conditions of the tree and the incidence of infection and testing different chemical control Apple indoor and Rot Field tests come to the tree by the number of bacteria infection and the incidence and number of orchards within closely related to the number of pathogens and control of Antagonism disease should vigorously promote corruption and clean, followed by the Wu-ling chlortetracycline, should s