油橄榄炭疽病是由 Colletotrichum sp 侵染所致。在陕西,该病主要危害油橄榄果实、枝梢、芽、花及叶片,亦危害实生幼苗等。感病严重时,使果实产量和质量下降,并影响出油率和使油质变劣。一、症状油橄榄炭疽病主要危害油橄榄果实及枝、芽等器官。枝梢发病常造成顶梢落叶变成光枝,而后逐渐形成干梢。叶片发病较果实发病率低,病斑多从叶尖开始,亦有从叶缘发病,病斑呈不规则状。嫩叶初发病,叶尖先出现点状失绿,逐渐扩大变为灰色,致使嫩叶尖端向上卷缩。老叶病斑为淡褐色,病斑边缘深褐色,斑上有黑色小点(分生孢子盘)。果实发病,每个果实上病斑数不一致,分布也不规则。果实上病斑初发生为褐色小点,而后凹陷呈轮纹状扩大,病斑扩大超过果实的一半后,果实发生皱缩而变干,病 Olive anthracnose is caused by the infection of Colletotrichum sp. In Shaanxi, the disease endanger the olive fruit, shoots, buds, flowers and leaves, but also endanger the emergence of seedlings. Serious illness, the fruit yield and quality decline, and affect the oil yield and deterioration of oil quality. First, the symptoms Olive anthrax olive oil harms the main fruits and branches, buds and other organs. Shoots often cause top-shoot leaves into light branches, and then gradually formed dry tip. Leaf incidence is lower than the incidence of fruit, lesions and more from the leaf tip, but also from the leaf margin disease, lesions were irregular. The early onset of young leaves, leaf tips first punctate chlorosis, gradually expanded into a gray, resulting tip of the tender tip curled up. The old leaf spot is light brown, dark brown edge of the lesion, black spots on the spot (conidia disk). Fruit disease, each fruit on the spot number is inconsistent, the distribution is irregular. Lesions spotted brown spots early on the fruit, and then hollowed round pattern to expand the lesion to expand more than half of the fruit, the fruit shrinks and dries, the disease