2001年冬季罕见的暖冬天气,过高的气温和稀少的降水使大量的病虫原得以安全越冬,根据以往的经验,2002年早春至初夏,冬春茬厚皮甜瓜的病虫害有偏重发生的可能。生产者应重点做好防治以下几种病虫害的准备。一、白粉病主要危害叶片和茎蔓。发病初期,出现圆形白色小斑点,逐渐扩大,使整个叶片或茎蔓上布满白粉。以后逐渐变成灰白色并出现褐色或黑色小颗粒,症状明显。上部幼叶与下部老叶发病较少,中部叶片发病较多。只 According to past experience, in early winter and early summer of 2001, pest and disease of winter melon with thick-skinned muskmelon may be more or less likely to occur, according to the rare winter warm weather, excessive temperature and sparse rainfall in winter 2001. . Producers should focus on prevention and control of the following types of pests and diseases preparation. First, the main hazards of powdery mildew leaves and stems and vine. Early onset, a small round white spots, gradually expanding, so that the entire leaves or stems covered with white flour. After gradually turned gray and appear brown or black particles, the obvious symptoms. Upper leaves and the lower part of the lower incidence of less old leaves, more incidence of central leaves. only