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TEMPORAL DYNAMIC OF ANNUAL EPIDEMIC OF WHEAT POWDERY MILDEW IN HENAN EFFECTS OF THE SEED-BORNE RATE AND LANDING AMOUNT OF ALATAE ON THE EPIDEMICS OF SOYBEAN MOSAIC VIRUS Resistance evaluation of peanut varieties to peanut scab and the epidemic dynamics in Liaoning Province Epidemics of the Rice stripe virus in northern Zhejiang, China Discovery and studies on CY32, a new race of Puccinia striiformis f. sp. tritici in China