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泡桐苗木炭疽病(Colletotrichum RawaRamii Miyabe),近年来为害严重,致使泡桐播种、育苗易遭损失。 一、症状:泡桐炭疽病主要发生在苗期,大树仅在嫩梢及丛枝上发生。在幼苗期(2—4叶片)发病,开始叶片变暗绿色,而后倒伏死亡。苗木木质化后(6叶片以上),在茎部、叶柄、叶片出现病斑,以后逐渐变褐色扩大,组织凹陷,成椭圆形、或不规则状。分生孢子盘在寄主表皮下形成,而后突破表皮出现粉红色分生孢子堆,分生孢子飞散后,秋末在病斑处形成黑色小点。病害发生严重期,病斑连成片(或长带),引起苗木茎部干缩枯死。
Paulownia seedling anthracnose (Colletotrichum RawaRamii Miyabe), serious damage in recent years, resulting in planting of Paulownia, nursery vulnerable to loss. First, the symptoms: Paulownia anthracnose occurs mainly in the seedling stage, trees only occur in tender shoots and branches. In the seedling stage (2-4 leaves) onset, the leaves began to darken green, and then lodging death. Seedlings lignification (6 leaves above), in the stems, petioles, leaf lesions appear, after gradually brown to expand, the organization hollow, into an oval, or irregular. Conidiophores formed under the epidermis of the host, and then broke through the epidermis pink conidia pile, after the conidia fly, the late autumn spots in the formation of black dots. Severe disease occurs, even with a piece of film (or long band), causing stem shrinkage shrinkage dead seedlings.