灰霉病是目前棚栽番茄严重的病害之一,主要危害果实,对产量和效益影响很大。如环境适宜,防治好的减产20％,而防治不及时、不得法则严重减产。 一、病菌特点 （一）腐生性强,先从死的、衰老的组织或器官上感染,然后繁殖,再进行浸染危害。 （二）属低温型病害,发病温度低且发病早,主要为害花果,发病最低温度1℃,最高31℃。低温高湿是发病的主要条件,沾花是人为传播,花期是为害高峰,温度15℃以上,空气相对湿度80％时开始发病,20-23℃,空气相对湿度95％时发展很快。 （三）病菌生理小种多,变异进化快。以多种方式存活,如菌核、菌丝、分生孢子等随病残体在土壤中。 二、发病症状 （一）叶部症状为“V”型,多从叶尖开始发病,空 Botrytis cinerea is one of the most serious diseases of greenhouse tomato cultivation. It is a major hazard to fruits and has a great impact on yield and benefits. If the environment is suitable, prevention and control of a good cut 20%, while the prevention and treatment is not timely, not the law severely cut production. First, the characteristics of bacteria (a) saprophytic, first from the dead, aging tissue or organ infection, and then multiply, and then disseminated harm. (B) is a low-temperature-type disease, the incidence of low temperature and early onset, mainly pests, incidence of the lowest temperature 1 ℃, maximum 31 ℃. Low temperature and high humidity is the main condition of the disease, the flower is artificial propagation, flowering is the peak of damage, the temperature is above 15 ℃, the relative humidity of 80% air began to attack, 20-23 ℃, relative humidity 95% of the rapid development. (C) pathogenic bacteria race more mutation rapid evolution. Survive in a variety of ways, such as sclerotia, mycelium, conidia and other diseases with the residue in the soil. Second, the onset of symptoms (a) leaf symptoms for the “V” type, and more from the tip of the onset of disease, empty