5月下旬至6月上旬初,笔者在湖北汉川市刁东农场调查农业生产时,发现该场部分农民种植的梨树新展现的嫩梢,有的部分幼叶出现皱缩,有的几乎全部幼叶高度卷缩。进入梨园仔细检查,剥开卷叶看到的是蚜虫在为害梨树嫩梢。为害梨树的蚜虫有两种,一种是梨二叉蚜,另一种是绣线菊蚜。这两种蚜虫都只为害梨树幼嫩枝梢的幼叶,其中,绣线菊蚜比梨二叉蚜为害要严重得多。 From late May to early June, when I investigated the agricultural production in Diaodong Farm in Hanchuan City, Hubei Province, I found some young shoots newly displayed by peasants planted by some peasants in the field, and some of the young leaves shrunk. Some of them almost All young leaves are highly curled. Into the pear orchard carefully check, peel curled leaves to see the aphids pear damage in the tender tip. There are two kinds of aphids that damage the pear tree, one is the pear aphid and the other is the spiraea aphid. Both of these two kinds of aphids are only young leaves of young pear shoots, among them, the Spiraea aphida is more serious than the pear Aphis gossypii.