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西华县地处豫东南平原区,是国家小麦生产基地县,常年小麦播种面积在667万公顷左右。2012年由于气候等因素的影响,小麦赤霉病在该县大流行,其流行特点一是发病快,二是面积大。据西华县植保站5月15～25日对全县各乡镇普查,该病病田率100%,平均病穗率24.1%,最高94%。全县发生流行面积达667万公顷万亩。预计减产25%以上。一、发生流行原因分析1.气候因素今年该县春季前期(3～4月份)气温回升慢,气温低,降水少,小麦生育期推迟。4月24～25日,该县普降中到大雨,降雨量为41.9毫米,因此期大部分早播麦田正值扬花期,为小麦赤霉病流行创造了极为有
Xihua County is located in the southeast of Henan Plain, is a national wheat production base counties, perennial wheat sown area of 6.67 million hectares. Due to climate and other factors in 2012, wheat head blight in the county pandemic, its epidemic characteristics of a quick onset, and second, large area. According to Xihua County Plant Protection Station on May 15 ~ 25 on the county’s census of towns and villages, the disease rate of 100% of the disease, the average disease ear disease rate of 24.1%, the highest 94%. The prevalence of the county reached 6.67 million hectares mu. Expected to cut 25% more. First, the occurrence of epidemic analysis 1.Climate factors This year the county early spring (3 ~ April) temperature slow recovery, low temperature, less precipitation, wheat growth period postponed. April 24 ~ 25, the county plummet to heavy rains, the rainfall is 41.9 mm, so most of the early sowing wheat fields at the blooming period, the epidemic of wheat scab created extremely