辽宁省是我国主要梨产区之一,近年发展尤为迅速,总株数近4000万株,年产量32万余吨。近几年,梨黑星病发生十分普遍,为害相当严重。防治该病已成为梨树生产上的一项重要工作。1 症状梨黑星病主要为害叶片及果实,其症状特点是在病部产生黑色霉状物。叶片受害多先发生于叶背面,在叶脉上形成长条形黑色霉斑。在叶表面的叶脉间产生近圆形褪绿斑,不久病斑上长出初为绿褐色后变黑色的霉状 Liaoning Province is one of the major pear producing areas in our country. In recent years, it has developed rapidly, with a total number of nearly 40 million trees and an annual output of more than 320,000 tons. In recent years, pears scab is very common, the damage is quite serious. Prevention and treatment of the disease has become an important work in pear production. 1 Symptoms pear scab is the main damage leaves and fruits, the symptoms are characterized by black mold in the diseased parts. More damage to leaves first occurred in the leaf back, forming a long strip of black mold on the veins. Near the leaf surface of the leaf veins produce roundish green faded spots, and soon after the growth of lesions on the beginning of a green-brown black moldy