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一、叶凋萎病。主要为害叶片。初发病时,叶片上出现圆形小病斑,呈紫红色,靠近叶缘有时出现椭圆形病斑。病斑边沿颜色较深,内部较浅,叶片主脉上出现病斑时便迅速扩散,蔓延整个叶片。发病初期,病叶仅在中午前后,光照强、温
First, leaf wilt disease. The main damage leaves. Early onset, the leaves appear round small lesions, was purple, sometimes near the leaf margin oval lesions. Lesions along the edge of darker color, the interior is shallow, the main vein lesions appear rapidly spread, spread the entire leaf. Early onset, diseased leaves only around noon, light strong, warm