玉米弯孢菌叶斑病侵染概率测定

Test of Infection Probability of Curvularia lunata in Maize

试验采用人工接种方法 ,初步测定了室内和田间条件下玉米不同生育期的病害侵染概率。结果表明 ,玉米弯孢菌侵染概率界于 0 .0 1 0 1～ 0 .2 6 2 8之间 ,其中玉米拔节期室内离体叶保湿接种侵染概率平均值为0 .1 6 2 7,而玉米拔节期田间雨天接种侵染概率平均值为 0 .1 5 4 3;玉米开花期室内离体叶保湿接种侵染概率平均值为 0 .2 6 2 8;而玉米开花期田间干旱条件下接种 ,侵染概率平均值仅为 0 .0 1 0 1。玉米在开花期比拔节期抗病性差 ,同时湿度是影响侵染概率高低的主要因素。

Maize leaf spot caused by Curvularia lunata (Wakker) Boed was an important epidemic disease in recent years. In this dissertation, the infection probability of the pathogen was studied in the laboratory and the fields. The result showed that the infection probability of the pathogen to maize is 0.0101～ 0.2628 , and the resistance of maize florescence is lower than that of maize elongation stage. Humidity is the main factor of the epidemic of the disease.