每年12月至翌年2月是江南地区的冬季。多年来我市冬季平均最低气温在3℃左右,这个季节大多数病虫进入休眠期,为害停止或减轻。但少数病虫因其特殊的耐寒性,仍然为害,有的甚至仍能大量发生。在疏于防范的冬季,病虫缓慢地扩大越冬基数,一到气温稍回暖的春季便以迅雷之势扩大为害面积。 December to February the following year is the winter in southern China. Over the years, the average winter minimum temperature in our city is about 3 ℃. Most of the pests and diseases in this season have entered dormancy period and the damage stops or loses. However, a few pests are still harmful because of their special cold resistance, and some can even occur in large numbers. In the neglect of the winter, pests and diseases slowly expand the winter base, a little warmer spring temperatures will be thunder and lightning to expand the damage area.