番茄灰叶斑病是近年来新上升的一种番茄病害,已成为河北永年县冬春茬番茄的主要病害之一。该病今春在永年县4月中旬始见于日光温室番茄,后在小拱棚番茄上也有发生。据植保站5月上旬调查,病棚率72%,病株率48.4%,病叶率12.3%。一、危害特征该病害以危害叶片为主,环境条件适宜时,还危害茎秆和果实。发病初期叶面布满圆形或不规则 Tomato gray leaf spot is a newly rising tomato disease in recent years and has become one of the main diseases of winter and spring tomato in Yongnian County, Hebei Province. The disease in Yongnian County in early spring in mid-April saw the tomato in the greenhouse, but also occurred in the small shed tomato. According to the plant protection station survey in early May, shed shed rate of 72%, diseased plants rate of 48.4%, diseased leaf rate of 12.3%. First, the hazard characteristics of the disease to harm the leaves of the main environmental conditions suitable, but also endanger the stalks and fruits. Early onset foliar or irregular round