[Objective]The aim was to find biological agents suitable for effective prevention and control of PVY and root knot nematode disease in Zhaoyang District,and reduce the loss of flue-cured tobacco production caused by PVY and root knot nematode disease.[Method]The two dis-eases were jointly prevented by random combination of the four agents for preventing and controlling root knot nematode disease and the three a-gents for preventing and controlling potato Y virus disease,and the effect of incidence of root knot nematode disease on PVY morbidity and disease index was studied.[Result]Three optimal combinations were found as followed:firstly,under the premise of controlling root knot nematode dis-ease with Kenbang Xianzun granules(0.5%abamectin),apply Ke-Y-Terling(5.6%pyrimidine morphine guanidine)later as a control agent of potato virus Y disease,and the disease index was low;secondly,under the premise of controlling root knot nematode disease with Jindongwang (Avi Carbosulfan),apply ningnanmycin(8%junkeduke water agent)as a control agent of potato Y virus disease,and the disease index was low;thirdly,under the premise of controlling root knot nematode disease with Jindongwang,apply harpin protein(3%fine granule)as a control agent of potato virus Y disease,and the disease index was low.[Conclusion]According to the results,on the one hand,potato virus Y and root knot nematode disease should be prevented and controlled separately.Tobacco potato virus Y disease still attacked in the absence of root knot nema-tode.Therefore,people should change their thought of killing two birds with one stone,i.e.preventing and controlling potato virus Y disease while preventing and controlling root knot nematode disease.In areas attacked by the two diseases at the same time,more attention should be paid to simultaneous prevention and control of the two diseases.The presence of root knot nematode will increase the incidence of potato virus Y disease.%[目的]探讨适合昭阳区的有效防治马铃薯Y病毒(PVY)和根结线虫的生物药剂,降低PVY和根结线虫病对烤烟生产造成的损失.[方法]通过防治根结线虫病的4种药剂和防治马铃薯Y病毒病的3种药剂之间的随机组合进行2种病害间的联防,研究根结线虫的发生对PVY 发病率和病情指数的影响.[结果]得出3种最优组合:一是在施用0.5%肯邦线尊颗粒剂(0.5%阿维菌素)作为防治根结线虫病的前提下,后期施用克y特灵(5.6%嘧肽吗啉胍)作为防治马铃薯Y病毒病的药剂,病情指数表现偏低;二是在施用金东旺(阿维· 丁硫)作为防治根结线虫病的前提下,施用宁南霉素(8%菌克毒克水剂)作为防治马铃薯Y病毒病的药剂,病情指数表现偏低;三是在施用金东旺作为防治根结线虫病的前提下,施用超敏蛋白(3%微粒剂)作为防治马铃薯Y病毒病的药剂,病情指数表现偏低.[结论]根据研究结果,一方面马铃薯Y病毒病和根结线虫病应分别防治;因为烟草马铃薯Y病毒病在没有根结线虫的情况下照样发生,所以需改变防治根结线虫病的同时也达到防治马铃薯Y病毒病的想法;在2种病同时严重发生的地域,更应重视2种病的同时防治.另一方面根结线虫的存在会加重马铃薯Y病毒病的发生.
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