近期,山东省五莲县街头镇的很多农民反映:他们家麦田发现有很多麦蜘蛛和蚜虫,并且麦苗不同程度的出现叶片零星或连片发黄的现象。据对麦田的调查研究分析,出现此类情况主要是由于近期频繁的气温骤升骤降,致使小麦遭受冻害形成的。在小麦返青期,温度是影响小麦生长的主要因素。小麦返青起身的这段时间正处于冷季转换到暖季的过渡阶段,每隔一段 Recently, many peasants in Jietou Town, Wulian County, Shandong Province reported that many wheat spiders and aphids were found in their wheat fields and that sprouts were sporadic or contiguous to varying degrees. According to the investigation and analysis of wheat fields, such cases are mainly due to the recent frequent sudden surge in temperature, resulting in frost damage to wheat. During the turning-back period of wheat, temperature is the main factor that affects the growth of wheat. Wheat turn green up this time is in the cold season to transition to a warm season transitional period