田间试验表明,玉米螟微孢子虫病垂直传播时发病较重,收获期虫口密度显著降低,水平传播时发病较轻,虽然发病率高达91.5—95.5％,虫口密度降低也不显著。越冬期染病螟虫虫口进一步降低,至前蛹期达到高峰,但残存虫仍有近半数带病虫羽化成为新的传染源。试验还表明,在单株含虫1—12头范围内,两个玉米品种单株每增1虫减产1.32—1.39％,另一品种不同虫量处理的产量无显著差异,表现高度耐螟,微孢子虫和耐螟品种在控制玉米螟虫口方面有协同作用。 Field trials showed that the incidence of microsporidiosis was more serious when it was vertically transmitted, and its population density was significantly lower at the harvesting stage. The incidence was lower at the level of transmission. Although the incidence rate was as high as 91.5-95.5%, the population density was not significant. In winter, the population of borer borer further decreased and peaked at the first pupal stage, but nearly half of the remaining pests still became the new source of infection with pests and parasites. The experiment also showed that within the range of 1-12 heads per plant, the yields of 1.10-1.39% of the two maize plants per plant were not significantly different from those of the other ones, Microsporidia and borer breeds have synergistic effects in controlling corn borer population.