梨树疫腐病的发生及防治技术梨树疫腐病又叫疫病，黑胫病。１９９５年通过调查，全县幼树梨园普遍发生，以鸭梨发病较重。此病发病快，死亡率高，是一种毁灭性病害。１发病症状该病主要发生在鸭梨幼树主干基部，砧穗接口以上，病部树皮呈黑褐色，形状不规则，从表皮发病到... Pear blight occurrence and prevention and control technology Pear blight also known as blight, black shank disease. In 1995 through the investigation, the county poplar pear orchard occurred in general, with a heavier incidence of pear. The disease is fast onset and has high mortality rate, which is a devastating disease. 1 Symptoms The disease occurs mainly in the base of pear saplings, scion spike interface above the diseased bark was dark brown, irregular shape, from the onset of epidermis to ...