香料烟细菌性斑点病的调查研究

对香料烟细菌性斑点病的症状观察发现,香料烟细菌性斑点病主要为害叶片,初为黑褐色水浸状圆形或多角形小斑点,以后病斑扩大、连片,形成不规则的较大坏死斑,新发的病斑夹杂其间,病斑大小不一。2001、2002年普查结果表明,在保山香料烟栽培区的隆阳区芒宽乡和昌宁县柯街镇普遍发病,发病田块达60%,平均病株率在25%以上;其他烟区仅见零星发病,病株率均在1%以下。在调查中也发现品种、温湿度、烟叶的成熟度、栽培条件等对病害的发生与流行影响较大。病原属于假单胞菌属(Pseudomonas)细菌。 

An investigation into bacterial spot disease in oriental tobacco

Symptoms of bacterial spot in oriental tobacco were observed in Baoshan, Yunnan province. It was found that the disease mainly damage tobacco leaves. Initial symptoms were black circular or polygonal little spots seemed as been soaked in water. Later these spots expanded and merge, forming large irregular necrotic spots. Because new disease spots appeared and mixed up with old disease spots, small and large spots were both present in tobacco leaves. Surveys were conducted in main oriental tobacco growing areas of Baoshan in 2001 and 2002. Results showed that the disease occurred widely and severely in Longyang Mangkuan and Changuing Kejie, and the disease area was up to 60% in field, of which more than 25% tobacco plants were infected. In other growing areas, a small number of diseased plants were observed, lower than 1%. Occurrence and expansion of the disease were influence by tobacco varieties, temperature and humidity, leaf maturity, cultivating conditions. It was also found that the pathogen belongs to Pseudomonas.