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梨锈病(Gymnosporaugium haraeanum Syd.)是转主寄生的病害。春季,冬孢子角膨胀,冬孢子萌芽,担孢子传播与侵染梨树,取决于适宜的气候条件。潮湿天气,特别是雨天,对冬孢子角胶化和萌发是必需的。此病害发生于3月下旬到4月,在梨芽展叶期天气潮湿或雨天,有利于冬孢子角胶化和担孢子萌发侵入。石灰硫磺合剂、多菌灵和福美双等,能有效地杀灭桧柏上的冬孢子角;托布津和多菌灵等能保护梨树免受病菌侵染。
Gymnosporaugium haraeanum Syd. Is a major parasitic disease. Spring, winter spore angle expansion, winter spore germination, spread of spores and pear infection, depending on the appropriate climatic conditions. Moist weather, especially rainy days, is essential for winter sporulation and germination. The disease occurred in late March to April, wet or rainy days in the pear leaf sprout leaf stage, is conducive to winter spore gelatinization and spore germination invasion. Lime sulfur mixture, carbendazim and thiram, which can effectively kill the teliospore horn on juniper cypress. Topuzine and carbendazim can protect the pear from pathogen infection.