由于大棚地块固定,蔬菜种植茬次多,常造成新的病害的流行。芹菜重茬严重,引起大棚芹菜菌核病的为害逐渐加重,为害面积愈大,常造成较大的损失,甚至绝收。为寻求有效的防治途径,对其发生特点及防治方法进行了观察研究,现将结果初报如下: 1.症状初侵染主要发生于叶片上,从叶缘向内发展,受害部初为褐色水浸状,呈椭圆形或不规则形。叶柄和茎部发病多为再侵染,受害部初里水浸状褐色凹陷,以后植株表皮易干枯纵裂,叶柄和茎腐朽,呈纤维状,茎内中空。受害部因湿度大小不同,病斑颜色有深有浅。湿度 As a result of a fixed greenhouses, vegetable planting stubble times, often resulting in the prevalence of new diseases. Celery successive cropping serious, causing the greenhouse celery sclerotiorum damage gradually increased, the larger the damage area, often resulting in greater loss, or even absolute. In order to seek effective ways of prevention and treatment, its characteristics and methods of prevention and treatment were observed and studied. The results are reported as follows: 1. Symptoms Initial infection mainly occurs on the leaves and inwardly from the leaf margin, Flooding, oval or irregular shape. Most petioles and stems were re-infected. The affected area was flooded with brown depressions. Afterwards, the epidermis of the petioles was easy to dry, and the petioles and stems were decayed and fibrous. The stems were hollow. Damaged by the humidity due to different sizes, spot color depth and depth. humidity