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近几年玉米褐斑病发生逐渐严重,已成为玉米生产上的一种主要病害。2007～2009年连续3年对冀东地区玉米褐斑病的发生规律进行了调查,并对57份美国GEM种质资源进行了田间自然发病条件下的抗病性鉴定。结果表明,7月份的降雨量是褐斑病流行的重要因素,Logistic模型能较好地拟合降雨量对褐斑病流行的影响;玉米拔节期是褐斑病防治关键期,当累积降雨量达到247.7 mm时要及时进行防治。抗病性鉴定结果表明,GEM种质资源中有37份免疫材料,占鉴定总数的64.91%;有8份抗性材料,占总数的14.03%。
In recent years, the occurrence of maize leaf spot gradually serious, has become a major disease in maize production. In 2007-2009, the occurrence of maize leaf spot in the eastern part of Hebei Province was investigated for three consecutive years. Fifty-seven American GEM germplasm resources were identified for their disease resistance under natural conditions in the field. The results showed that the rainfall in July was an important factor in the brown spot epidemic. Logistic model could well fit the effect of rainfall on the brown spot epidemic. The jointing stage of corn was the key period for the control of brown spot. When the cumulative rainfall To 247.7 mm when timely prevention and treatment. The results of disease resistance identification showed that there were 37 immunological materials in GEM germplasm resources accounting for 64.91% of the total number of identifications, and 8 resistant materials, accounting for 14.03% of the total.