梨黑星病在陕西关中地区为害非常严重,经常在6—7月间流行,引起巨大损失。当冬季干燥寒冷时,病菌主要以落叶上残存的分生孢子过冬,但是如果遇上潮湿温暖的冬季便可大量形成子囊壳;至于病菌能否在病梢、病芽内外越冬的问题,初步试验结果是否定的。病害流行与降雨及温度的关系最为密切,潜育期为12—29天,具体情况随气温而定;另外还初步提出了病害初次侵染与续发侵染的预测条件。在武功采集到另一类型的梨黑星病菌,其特点是分生孢子梗非常细长,上面的瘤状物也较突出明显;推测可能同于 Venturia inaequalis f.piri Hara。喷射1∶1∶160式波尔多液并结合进行清园,减少越冬菌源及加强栽培管理,提高树势等项工作对病害防治具有优良效果。 Pear scab in the Guanzhong area in Shaanxi Province is very serious damage, often in the June-July epidemic, causing great losses. When the winter is dry and cold, the germs mainly take the conidia survived on the fallen leaves. However, if they encounter humid and warm winters, they can form a large number of ascosphere shells. As for whether the germs can overwinter inside or outside the disease buds, preliminary tests The result is negative. Disease epidemic and rainfall and temperature are most closely related to the incubation period of 12-29 days, the specific circumstances with the temperature may be; also initially proposed the initial infection of the disease and the prognosis of the infection. Another type of Pearson pear-shaped pathogenic bacteria was collected in martial arts. The characteristic of the conidiophores was that the conidiophores were very slender, and the nodules on them were more conspicuous. The speculation may be the same as in Venturia inaequalis f. Piri Hara. Spraying 1: 1: 160 Bordeaux mixture and combined with the Qingyuan, reduce overwintering bacteria and strengthen the cultivation and management, improve the tree shrubs and other work on disease control with excellent results.