摘要
不同地区玉米纹枯病产量损失测定结果表明,产量损失与病情严重度级别之间存在着显著的直线相关,严重度每提高一级,产量损失增加约10％左右,在产量损失的构成中,千粒重下降处于主导地位,粒数的减少其次;始病愈早,发病愈重,相应的产量损失也愈大。不同地区,播期不同,发病期亦不同。从生育期来看,却是基本一致的,玉米抽雄期为发病始盛期,乳熟期为发病高峰期。品种间发病差异明显,但未发现高抗品种,目前生产上广泛应用的掖单系统杂交组合,中抗至中感,其丰产性较好。增施钾肥112.5～262.5kg能显著地减轻病害和增加产量,可作为防病措施推广应用。另外,大田调查还发现,轮作、间作和控制种植密度能减轻病害发生。
The yield loss caused by corn sheath blight was determined in different areas of Jiangsu Province. The result shows that the yield loss was linearly related significantly to the scales of the disease severity. The yield loss increased about 10% along with every increased scale of severity. The decrease of the weight of one thousand grains was the predominant factor in the components of the yield loss. The earlier the disease occurred, the more severe the sheath blight was. The corresponding yield loss was great as well. The period of disease was consistent in terms of growth period. The disease reached the peak period at milk stage. The disease severity in different cultivars was apparent but there were not highly resistant cultivars. The widely growing commercial hybrids Ye Dan and its derivatives were moderately resistant to moderately susceptible. The yield was high. The disease was decreased and the yield was increased if 112. 5 - 262. 5kg K fertilizer was applied per hm2. It was found by field investigation that rotation, intercropping and proper plant density could reduce the occurrence of the disease.
出处
《植物保护学报》
CAS
CSCD
北大核心
1997年第2期101-106,共6页
Journal of Plant Protection
关键词
玉米
纹枯病
损失测定
发生规律
corn sheath blight, yield loss, outbreak regularity
