近年来,随着三北重点防护林工程及退耕还林工程的实施,新疆伊犁地区杨树造林面积逐年增大。由于树种单一、管理粗放,使得杨树病害发生日趋严重,给杨树生产造成了一定的经济损失。因此,对杨树病害进行调查,掌握其发生规律,制定切实有效的防治措施,对杨树产业具有十分重要的意义。一、杨树炭疽病识别要点:枝梢部发病初期呈现出褐色小斑点,后逐渐扩大为梭形至不规则形淡褐色病斑,中央凹陷,病健交界处明显色深、隆起。病斑逐渐扩大绕枝一周时,病部以上枝条枯死。后期病斑中央产生黑色小粒,为病菌的分生孢子盘。叶部被害初期,叶面也现失绿水渍状斑点,逐渐变为淡褐色,病斑不定型,扩大至叶缘、叶脉时,发展较快,病健交界处明显。病斑中有时见有黄褐色轮纹,后期病斑上出现黑色小点状分生孢子盘。遇 In recent years, with the implementation of the Three-North Key Protection Forest Project and the project of returning farmland to forestland, the area of ​​afforestation in Yili Prefecture has been increasing year by year. Due to a single tree species, extensive management, making poplar disease occurs more and more serious, to poplar caused some economic losses. Therefore, it is of great significance to poplar industry to investigate the poplar disease, master its occurrence law and formulate effective and effective prevention measures. First, the identification of poplar anthracnose points: the early emergence of small branches brown spots, and gradually expanded to fusiform to irregular-shaped light brown spots, the central depression, the junction of disease-health obvious color depth, uplift. Lesions gradually spread around the branches a week, the diseased branches above dead. Post-lesion central black particles generated for the pathogen conidia plate. Leaf damage early, the leaf surface is now greenish water stain-like spots, gradually turned to light brown, spot unsteady, expanded to the leaf margin, veins, the rapid development of disease at the junction of health obvious. Occasionally see yellowish brown wheel pattern, late dot lesions appear black dot conidia disk. Case