大豆疫霉病发生危害及影响其发生因素的探讨

Investigations of soybean phytophthora root rot disease and its determinant factors.

经1995～1998年对黑龙江省大部分大豆产区调查明确,大豆疫霉病在黑龙江大豆产区的发生面积及危害程度有逐年扩大和加重趋势,田间发病率一般为3%～5%,严重达75%,甚至绝产。其发病严重原因除受品种抗病性的因素影响外,主要取决于降水的多少及土壤积水时间的长短。此外,耕作、栽培方式、茬口等因素也不同程度影响发病。大豆在整个生育期间都可受到疫霉菌的侵染。

The soybean phytophthora root rot in soybean production areas in Heilongjiang Province was in vestigated in 1995-1998. The results showed that the occurring areas and severity of the disease tended to increase year by year. The disease incidence in soybean fields was generally 3%-5% and the serious reached 75% and even no yield. The main determinant factors of the disease occurrence were rainfall and the time of accumnlated water in soil as well as the resistance of soybean varities. Besides, to various extent, cultivating, planting pattern, and rotating crop, etc, also executed influences on the disease occurrence. Soybean could be infected by phytophthora during whole growth season.