Studies on spores flying disease gradient and space distribution of corn common rust
2008
Wang Yanhong | Jiang Zhaoyuan | Wen Jiawe
Chinese. 对吉林省普通型玉米锈病菌孢子飞散、传播及空间分布进行了研究。结果表明：锈菌夏孢子白天飞散数量略多于夜间;小雨天捕获的孢子数量可比晴天多2倍左右。空中孢子密度随高度的增加而递减,高度（x）和孢子数量（y）的关系可用指数方程y=19.24exp（-0.027 89x）描述。在锈病的近程传播中,距菌源区距离（di）和锈病的发病程度（xi）的关系呈S型曲线,顺风向传播梯度可用Xi=505.27exp（-0.058 3di）描述;侧风向传播梯度可用Xi=988.32exp（-0.115 9di）描述。在菌源较多情况下,玉米锈病在1个月时间内顺风向传播距离大约为90～100 m;侧风向传播距离为50～60 m。玉米生育后期锈病在田间的分布呈聚集分布。[著者文摘]
Show more [+] Less [-]English. Spores flying disease gradient and space distribution of corn common rust in Jilin province were studied. The results showed that numbers of flying uredospores in the daytime is slightly more than that in the night. The numbers of uredospores captured in light rain days is more two times than that in sunny. The density of the rust spores in the air diminishes with the increase of height. The relation between height（x） and the number of spores（y） can be de scribed by regression equation, y=19.24exp（-0.027 89x）. The relation curve between distance（di） and number of lesions（xi） is a S pattern in the short distance spread of the corn rust. The regressive equation of downwind to spread was Xi=505.27exp（-0.058 3di） and regressive equation of side wind was Xi=988.32exp（-0.115 9di）. The distance of the disease spread is about 90 - 100 metres in the same direction as the wind, but 50 - 60 metres in the side direction in a month. Space distribution model of the disease is gathered in the field.
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