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杉木针叶上炭疽病菌(Glomerella cingulata)的潜伏侵染研究结果表明:(1)杉木不同冠位、不同枝段和不同叶片部位的潜伏侵染率不同;(2)当年针叶5月中旬开始受侵,8月末达侵染高峰,当半个月平均气温低于10℃时不发生侵染,(3)针叶潜伏侵染率随杉木林地位级升高而增加,发病程度随地位级升高而降低,(4)病害症状于4～6月表现在先年枝梢的顶端,病害程度同针叶潜伏侵染率无关;(5)针叶中还原糖含量高似乎是影响病菌打破潜伏侵染的因素。
The results of latent infection of Glomerella cingulata on Chinese fir needles showed that: (1) The latent infection rates of different crown positions, different branches and different leaf parts of Chinese fir were different; (2) In the middle of May, Invaded, the peak of infection reached by the end of August, and did not occur when the average temperature was lower than 10 ℃ in half a month. (3) The latent infection rate of needle increased with the increase of the status of Chinese fir plantations, (4) The symptom of the disease appeared at the top of the shoot of the first year in April-June, and the degree of disease had nothing to do with the latent infection rate of the needle. (5) The high content of reducing sugars in the needle appeared to affect the breaking of the germs Factors of latent infection.