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近几年京郊套种玉米,在苗期连续受到瑞典蝇、蓟马为害。1983年京郊14个县区的套种玉米普遍受到为害,平原地区较为严重。昌平县马池口公社18,000多亩套种玉米,受害率20%以上,严重地块可达40%以上,由于瑞典蝇、蓟马较小,不易发现,有的地区常误认是病害所致。瑞典蝇以老熟幼虫在冬麦或杂草心中越冬,春季化蛹羽化。4、5月玉米出苗时,成虫将卵散产在2—3叶的玉米幼苗上。幼虫孵化后即从心
In recent years, intercropping corn in the suburbs of Beijing, in the seedling continuously by the Swedish fly, thrips damage. In 1983, the intercropping corn in 14 counties in the suburbs of Beijing was generally harmed, while the plains were more serious. Changping County, Ma Chi Kok commune 18,000 mu of intercropping corn, the damage rate of 20% or more, a serious block up to 40% or more, because the Swedish fly, thrips small, not easy to find, often mistaken for some areas caused by disease. Swedish flies overwinter with mature larvae in the winter wheat or weed heart, and spring pupae emerge. April and May corn sprouting, adult eggs will be scattered in 2-3 leaves of corn seedlings. After larvae hatch from the heart