【摘要】 苜蓿锈病的转主寄主——乳浆大戟，是我国北方苜蓿种植区的常见杂草之一。有锈病发生的苜蓿地内及附近的乳浆大戟，常常受到锈菌侵染，其感染率大约２０％左右。感染苜蓿锈菌的乳浆大戟是我国北方苜蓿早期发病的初侵染来源。５月中旬，在呼和浩特地区感病的乳浆大戟上可见锈孢子产生，６月上旬感病乳浆大戟附近的苜蓿植株开始发病。室内接种试验证明，乳浆大戟上的锈孢子，可以引起苜蓿发病，其潜育期８～９天。铲除苜蓿田内及附近的大戟属植物，应是我国北方苜蓿锈病综合防治的重要措施之一。更多还原

【Abstract】 The alternate host of alfalfa rust-leafy spurge is a common weed in the alfalfa area ofnorth China. Leafy spurge infected by Uromyces striatus were the source of early infec-tion for alfalfa. In the middle ten-day of May the aecidium and aecidiospore occure onleafy spurge, in the first ten days of June, alfalfas which are near to the rusted leafyspurge are infected. It was verified by indoor inoculation test that aecidiospore fromleafy spurge can cause the rust on alfalfa. The incubation period is eight to nine days.Eradication of leafy spurge in the alfalfa field and nearby area is an important measure inintegrated control of alfalfa rust in north China.更多还原