为了正确认识微生物杀线虫剂——“灭线宁”对烟草根结线虫病的防治效果,探求其在大田推广应用的可能性,进行了药效对比小区试验和大田示范使用试验。结果表明,微生物制剂——“灭线宁”对烟草根结线虫的相对防治效果达到２７．５%,基本与化学杀线虫剂涕灭威的防效相当,并能促进烟株的生长发育,增强烟株抗性,是一种能够被广大烟农接受的杀线虫药剂。 In order to correctly understand the control effect of Micronesia nematocide - “Offline” on root - knot nematode disease in tobacco, and to explore its possibility of popularization and application in the field, the efficacy comparison plot test and field demonstration use test were carried out. The results showed that the relative control effect of the microbial agent - “Offline” on the root-knot nematode of tobacco reached 27.5%, which was almost equivalent to that of the chemical nematicide Aldicarb. It also promoted the growth and development of tobacco plants, Enhance tobacco plant resistance, is a nematode agent that can be accepted by the majority of tobacco farmers.