大豆重迎茬对大豆根潜蝇种群数量的影响

在黑龙江省的黑河、安达、密山、汤原等9个市县，对大豆根潜蝇的种群数量与大豆重迎茬年数之间的关系进行了系统调查研究和防治试验。结果表明重迎茬加剧了大豆根潜蝇的危害，重茬1，2,3年的有虫株率分别比正茬高14．8％，23．5％和25．5％。在大豆根潜蝇的防治中，采用呋多福、甲多、大豆种衣剂、叶喷剂、绿肥和大豆硼肥等药剂进行防治，较对照明显降低了危害株率和有虫株率，对大豆根潜蝇防治效果达7．7％～88．5％。

The Population and Control of Ophiomyia shibatsuji in continuous cropping fields

Population and demage of Ophiomyia shibatsuji Spencen in continuous croping fields of soybean wereinvestigated in Heihe, Anda, Mishan and Tangyuan County, Heilongjiang Province. And controlling tests to O. Shibatsujiwere also conducted in Mishan and Heihe. The results showed that the percentage of damaged plants was increasedin continuous cropping lields, and the percentage of plants with insects in the fields of continuous cropping for 2, 3, 4years are 14.8%, 23.5% and 25.5% mere than in normal rotation fields separately. The field tests indicated that O. Shibatsuji could be effectively controlled by DF, JD, seed-coated chemicals. The percentage of injuring plantstreated with those chemicals was obviously decreased compared with controlling fields.