核桃盘二孢菌(Marssonina juglandis(Lib)Magn.)是核桃树最危险的侵染性病原之一。在嫩叶、叶柄、果实和枝条上开始出现不大的褐斑,褐斑逐渐扩大,10—15天后在褐斑上形成真菌子实体,上具环形排列的小黑点,小黑点内含有分生孢子。感病严重的枝条,其组织坏死,常常弯曲变形。幼嫩果实的整个果皮层可能受到真菌的 Marssonina juglandis (Lib) Magn. Is one of the most dangerous infectious pathogens in walnut trees. On young leaves, petioles, fruits and branches began to appear little brown spots, brown spots gradually enlarged, the formation of fungal fruiting bodies on brown spots 10-15 days, with a circular arrangement of black spots, black spots containing Conidia. Sick branches, its tissue necrosis, often bending deformation. The entire cortex of young fruits may be fungal