نوع مقاله : مقاله پژوهشی
نویسنده
مرکز تحقیقات کشاورزی و منابع طبیعی استان قزوین، ص. پ. 618-34185
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
Black spot (Anthracnose), Marssonia iuglandis (Lib.) Magn. is one of the most important and serious diseases of walnut, which have recently occurred widely in Qazvin province. Through an extensive survey in walnut growing areas of the province, two infected sites, one in mountain (Alamout) and the other in lowland areas (Ziyabad Takestan) were located. In the course of study, sampling procedures and examining the cycle of the diseases and recording the temperature and humidity rate were regularly conducted. We also examined the results, obtained in laboratory. According to the results, the main factors affecting the infection rate are as follows:
early-season occurrence of infected leaves and fruits were the most important sources of primary inoculums of the disease. When relative humidity stabled at80% for 24h, and temperature was in the range of l0- 20°C together with wind blowing, over 80% of ascospores were released. Where as, high humidity and wind during growing season are necessary for secondary infection occurrences and non-sexual spore dispersal.
کلیدواژهها [English]
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