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桧柏是锈病菌的越冬寄主。人们对绿化工作越来越重视,桧柏越栽越多,但无人喷药防治桧柏上的锈病冬孢子,因而病源扩大,苹果锈病日趋严重。
Cypress cypress is the winter host of rust. People pay more and more attention to the greening work. The more cypress cymbidium planted, but no one sprayed on the cypress rust rust winter spores, so the source of the disease to expand, the increasingly serious apple rust.