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近年来,国内在螟害对玉米产量损失影响的研究方面取得了很大进展。吴维均等(1963)以人工接卵方法研究了夏玉米“小黄”品种上穗期螟害对产量的影响,证明乳熟到腊熟阶段内,螟害对产量的影响极小,单株1虫的损失百分率仅0.89％(约折合每亩4斤)。以同样方法研究春玉米“农大7号”穗期螟害对产量的影响表明,开花授粉时接种者,对产量有一定影响,根据虫口密度与产量的回归式求出单株平均每增加1头幼虫的损失率为2.7％(约折合每亩22斤);而在乳熟中期接种者,则无影响,单株平均有虫10头以上的产量并不比单株有虫0.35头的产量为低。邱式邦等(196)在盆栽王米上分期接种结果,也证明心叶期接种者对产量的影响显著大于灌浆期接种的处理,后者在单株平均有虫3.5—15.1头时,产量与对照并无显
In recent years, great progress has been made in the research on the impact of stem borer on corn yield loss. Wu Wei et al (1963) to study the method of artificial oviposition of summer maize “Xiaohuang” varieties on the impact of stem borer on the yield, the milky ripe to waxy stage, the impact of stem borer yield is minimal, 1 insect loss percentage of only 0.89% (about 4 kg per acre). The same method was used to study the effect of stem borer at the heading stage of “Nongda 7” on the yield of spring corn. The results showed that in the pollination period, the inoculation had some effect on the yield. According to the regression equation of population density and yield, Larval loss rate of 2.7% (about equivalent to 22 pounds per acre); and mid-milk inoculation, no effect, an average of more than 10 plants per plant yield no more than 0.35 per plant per plant was low . Qiu et al. (196) Staged inoculation on Wangmian pots also showed that the effects of the leaf-center stage seeding on yield were significantly greater than those of the seeding stage. In the latter, when the average number of pests was 3.5-15.1, the yield No significant contrast with the control