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【小麦蚜虫】在河北、山东大发生,华北、黄淮的其他麦区、江苏和安徽沿淮和淮北、四川、宁夏偏重发生,长江中下游、西南和西北的其他麦区中等发生,全国发生面积2.5亿亩。据全国农作物病虫监测网调查,2013年秋季,蚜虫在黄淮、江淮、华北和西北麦区普遍发生,但虫量较低。平均百株蚜量,湖北为57.0头,北京为12.7头,陕西、山西、山东为3-5头,安徽、河北、宁夏、甘肃为2头以下,比历年平均值和2012年同期偏低40%-90%。目前我国各麦区普遍缺乏抗蚜品种,且种植密度高、氮肥用量大,对蚜虫种群增长十分有利。据国家气候中
Wheat aphid occurred in Hebei and Shandong, other northern China and Huanghuai wheat areas, Jiangsu and Anhui along the Huaihe River and Huaibei, Sichuan and Ningxia, while the other middle and lower reaches of the Yangtze River, southwest and northwest China occurred moderately and the whole country occurred An area of 250 million mu. According to the National Crop Disease and Pest Monitoring Network survey, in the fall of 2013, aphids were common in Huanghuai, Jianghuai, North China and Northwest China, but their numbers were low. Averaged about 100 aphids in Hubei, 57.0 in Hubei, 12.7 in Beijing, 3-5 in Shaanxi, Shanxi and Shandong, and less than two in Anhui, Hebei, Ningxia and Gansu, lower than the historical average and the same period in 2012 % -90%. At present, there is a general lack of resistant varieties of aphids in various wheat regions in our country, and the planting density is high and the amount of nitrogen fertilizer is large, which is very beneficial to the growth of aphids. According to the national climate