核桃腐烂病主要发病因子研究
Main Factors Affecting Walnut Rot Disease

采用正交试验的方法，研究了低温、低温处理时间和接种菌饼直径3个发病因子对核桃腐烂病的发病率、感病指数及潜育期的影响。结果表明，3个因素对核桃腐烂病的发生均有显著性影响，其影响程度依次为：接种菌饼直径>低温>低温处理时间，并且在-30℃下处理24 h后，接种菌饼直径为1.5 cm的条件下，核桃腐烂病发生最为严重。
Orthogonal test was adopted to investigate the influences of three main factors (low temperature, processing time and inoculation diameter) on attributes of walnut rot disease, such as incidence, infection index and incubation period of Cytospora juglandina. The results showed that these three factors had significant effect on the development of the disease. The effect level was in an order of inoculation diameter > low temperature > processing time. C. juglandina was the most serious when the test was conducted under the conditions of inoculation diameter, 1.5 cm, temperature, -30 ℃ after 24 hours