大豆褐纹病的发生规律和病害流行结构

Studies on The Epidemic Regularity of Soybean Brown Spot

大豆褐纹病在黑龙江省东部地区于 6月中旬始见病斑 ,始发病期与当时气象因素有关。病情在 6月下旬至 7月中旬增长较快 ,在 7月下旬至 8月上旬增长较慢 ,8月中旬至 9月初迅速增长 ,9月中旬以后病情逐渐趋于稳定。耕作栽培措施对病害流行有一定影响。病害流行程度主要取决于6月 2 0日至 8月

The soybean leaves were infected by Septoria glycines and presented morbid state after 7 or 15 days in June in the east of Heilongjiang provice. The beginning of the disease was closely related to the weather factors in June. The increase of the disease index was quick from June 21th to July 21th, or from August 11th to September 5th, slow from July 21th to August 11th, and stable after September 5th. The epidmic degree of soybean brown spot was closely related to the wather factors in the growth period of soybean.