塑料大棚番茄早疫病发生规律初步研究

Preliminary research on occurrence rule of early blight of tomato in plastic tunnels

对浙江省塑料大棚春番茄早疫病2年调查研究表明:早疫病初发于2月底至3月上旬,在5月中旬至6月达到高峰;年份间差异大,2002年发生重、增长快,病害增长率高达0.055528;2003年发生轻、增长慢,病害增长率为0.017999。在影响早疫病发生和流行的因素中,气象因素,特别是相对湿度(降雨)作用最大;叶位、植株长势等也密切相关,一般低位叶、长势弱的植株发病重。

Early blight of tomato in plastic tunnels in Zhejiang Province was investigated in 2002 an 2003. The results showed that the disease occurred at the end of February or in the first ten days of March and reached the peak between the second ten days of May and June. It occurred more heavily and develope more rapidly in 2002 than in 2003. In the factors influencing its occurrence and epidemic, meteorologic factors, especially relative humidity and precipitation had the greatest effect on it, and the leaf position ar growth vigor of tomato plants were also closely related to it. Generally the plants with low growth vigor ar the low position leaves had a heavy disease incidence.