梨黑星病梨黑星病是北方梨树最主要的病害,我省梨区常因该病造成严重的损失。根据该病的发生规律,做好测报、适期喷药,是防病保产的关键。 (一) 发生规律 1.初次侵染的来源:梨黑星病每年最初 Pear scab Pear scab is the most important northern pear disease, pear province in our province often cause serious damage. According to the occurrence of the disease, do a good job reporting, spraying at the right time, is the key to disease prevention and protection. (A) the law of occurrence 1. Source of primary infection: pears scab Beginning of the year