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对烟草赤星病菌[Alternaria alternata(Fries)Keissler]的形态、生物学特性测定的结果表明:它的分生孢子呈链状串生,有分枝链,大小为11.3～51.3μm×5.6～16.3μm,平均25μm×9.3μm.病菌生长温度范围6～37℃,适宜温度为20～30℃,最适温度25℃;分生孢子的致死温度为49℃10min,或50℃5min,生长的酸碱度范围是pH3.03～12.49,最适pH为5.56。分生孢子在饱和相对湿度下萌发率仅46％,但在水滴中可达85％。在0.1％蔗糖液、0.1％葡萄糖液和5％烟叶汁中,孢子的萌发均良好,和在水滴中的比,无显著差异,其中以5％烟叶汁的萌发率较高(94.4％)。温度在20～30℃时均适宜孢子的萌发,但以25℃为最适宜。
The morphological and biological characteristics of Alternaria alternata (Fries) Keissler showed that the conidia of the Alternaria alternata (Fries) Keissler showed chain conformation with branched chains with the size of 11.3 ~ 51.3μm × 5.6 ~ 16.3μm , Average 25μm × 9.3μm.The growth temperature range of bacteria was 6 ~ 37 ℃, the optimum temperature was 20 ~ 30 ℃, the optimum temperature was 25 ℃; the lethal temperature of conidia was 49 ℃ for 10min or 50 ℃ for 5min, Is pH3.03 ~ 12.49, the optimum pH is 5.56. Conidia germination rate of only 46% at saturation relative humidity, but up to 85% in the water droplets. Spore germination was good in 0.1% sucrose solution, 0.1% glucose solution and 5% tobacco leaf juice, and no significant difference in water droplet ratio was observed. The germination rate of 5% tobacco leaf juice was higher (94.4%). When the temperature is 20 ~ 30 ℃ are suitable spore germination, but 25 ℃ is the most suitable.