据国家气候中心预测:今年1~2月,长江中下游和北方冬麦区大部气温接近常年,对病虫害的越冬无明显不利影响;西南冬麦区大部气温偏高、南部降水偏少,有利于蚜虫等虫害的冬季发生。3~5月份,全国大部麦区气温接近常年同期或偏高,特别是河南北部、山东大部、山西中南部、河北南部等黄淮和华北主产麦区以及西南大部麦区气温显着偏高,有利于蚜虫、麦蜘蛛等虫害的种群上升和发生为害;全国大部麦区降水接近常年同期或偏多,特别是长 According to the National Climate Center, from January to February this year, temperatures in most of the middle and lower reaches of the Yangtze River and winter wheat areas in the north of the Yangtze River reach near normal levels, with no significant adverse effects on the overwintering of pests. Most of the winter wheat areas in southwest China have high temperatures, Is conducive to aphids and other pests in winter. From March to May, the temperatures in most wheat areas in most of the country were close to the same or higher than normal all the year round, especially in the areas of Huanghuai and North China and most of the southwest China, such as northern Henan, most of Shandong, central and southern Shanxi, southern Hebei, With high, is conducive to aphids, wheat spiders and other insect pests rise and take place harm; precipitation in most of the country’s wheat area close to the same period or more than normal, especially the long