内蒙古西部地区向日葵锈病流行规律

 向日葵是内蒙古近几年发展起来的一种重要经济作物,向日葵锈病随之而发生.经两年试验研究,基本明确了五月中下旬和六月中下旬的降水量是影响向日葵锈病流行的主导因素.五月中下旬降水量的多少直接影响冬孢子萌发及担孢子侵入寄主的数量;六月中下旬的降水量则影响锈孢子侵入寄主,形成第一代夏孢子的数量.从而影响病害的流行程度.在降水量正常的年份,七,八月份的降水量相对不很重要.

THE LAW OF SUNFLOWER RUST EPIDEMIC IN WESTERN REGION OF THE INNER MONGOLIA

The rust of sunflower has took place in western region of the Inner Mongolia in recent years.We studied twenty patterns of sunflower ruat epidemic of five counties for four years.It was shown that the second and last ten days-precipitations of May and/or June are the important factors affecting sunflower rust progress.The precipitation of May is responsible for the quantity of teliospore germination and basidiospore infecting hosts.That June's determines the quantity of aeciospore infecting hosts and formed urediospores which is related to the epidemie degree of sunflower rust.