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由炭疽病菌引起的苹果叶枯病初期症状为黑色坏死病斑,病斑边缘模糊。在高温高湿条件下,病斑扩展迅速,1~2天内可蔓延至整个叶片,使整个叶片变黑坏死。发病叶片失水后呈焦枯状,随后脱落。当环境条件不适宜时,病斑停止扩展,在叶片上形成大小不等的枯死斑,病斑周围的健康组织随后变黄,病重叶片很快脱落。当病斑较小、较多时,病叶的症状酷似褐斑病的症状。发病叶片在30℃保湿1~2天后,病斑上形成大量淡黄色分生孢子堆。病菌侵染果实后仅形成直径2~3毫米的圆形坏死斑,病斑凹陷,周围有红色晕圈,自然条件下果实病斑上很少产生孢子,与常见的苹果
The initial symptom of apple leaf blight caused by anthracnose was black necrotic lesion and the edge of the lesion was fuzzy. In high temperature and humidity conditions, lesions spread rapidly, 1 to 2 days can spread to the entire leaves, so that the entire leaves black necrosis. After the onset of leaves were coke-like water loss, then fall off. When the environmental conditions are not suitable, the lesion stops expanding, the formation of dead leaves of varying sizes on the leaves, healthy tissue around the lesion turns yellow, the sick leaves fall off quickly. When the lesion is smaller, more time, the symptoms of diseased leaves resemble brown spots symptoms. Leaf lesions at 30 ℃ moist 1 to 2 days, the lesion formed a large number of pale yellow conidia. Pathogen infection after the formation of only 2 to 3 mm in diameter round necrotic spots, lesions concave, surrounded by a red halo, natural fruit lesions rarely produce spores, and common apples