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日前,笔者获悉,目前北方春玉米主产区大部处于苗期生长阶段,长势良好,为一代玉米螟发生和为害提供了有利的寄主条件。6月北方春玉米产区气温接近常年同期略偏高,降水量多在50~100毫米,春玉米主产区大部气象条件对玉米螟发生发展较为有利。6月中下旬,北方玉米螟陆续进入一代幼虫为害期,下旬春玉米将进入拔节阶段,北方春玉米主产区除吉林西部、黑龙江西南部等地玉米螟发生偏轻
Recently, I was informed that, at present, most of the major spring maize producing areas in the north are in the stage of seedling growth and are in good growth. They provide favorable host conditions for the occurrence and damage of the first generation of corn borers. In June, the temperatures in the spring maize producing areas in the north were slightly higher than those in the same period of previous years, and the precipitation was mostly between 50 and 100 mm. Most meteorological conditions in the main spring maize producing areas were more favorable for the occurrence and development of the maize borer. In the middle and late June, the northern corn borer successively entered the larvae stage of infestation, and the spring corn entered the jointing stage in late spring. The main spring corn producing areas in the north, except the western part of Jilin Province and the southwestern part of Heilongjiang, occurred relatively lightly