越冬杂草是指越冬的一年生杂草(或称越年生杂草)和某些多年生杂草。通常多在秋季(少数在早春)发芽生长,年内仅发生叶丛,伴随越冬作物生长并为害,有的对晚秋作物亦有影响。一、越冬杂草的休眠现象: 据播种后观察,几种主要越冬杂草不同时期成熟的种子,出苗情况如下:(见表1) Overwintering weeds are overwintering annual weeds (or annual weeds) and some perennial weeds. Usually more in the fall (a few in early spring) germinate and grow, only the occurrence of leaf clump during the year, with the winter crop growth and damage, and some have an impact on late autumn crops. First, overwintering weed dormancy phenomenon: According to the observation after sowing, several main overwintering weeds mature seeds of different periods, emergence as follows: (see Table 1)