番茄斑枯病在生产上时有发生,严重时造成大量叶片枯死,对产量影响很大。因此,生产过程中如出现以下症状应及时防治,将损失尽量减少到最小。症状:叶片发病时,通常从靠近地面的老叶开始,向上蔓延,叶背面有水渍状小圆斑,后在叶片正反两面出现边缘暗褐色,中央灰白色,圆形或近圆形,略凹陷的病斑,上面散生少量小黑点,严 Tomato spot blotch occurs in the production, when severe, causing a large number of leaves withered, a great impact on the yield. Therefore, the production process, such as the following symptoms should be timely prevention and control, the loss minimized. Symptoms: The incidence of leaves, usually from the ground near the old leaves began to spread upward, leaves a small water mark on the back of the spot, after the leaves appear on both sides of the edge dark brown, central gray, round or nearly circular, slightly Depression of the lesion, scattered above a small amount of black spots, strict