我省黄河以南的大部分地区 ,大白菜杂交制种多采用秋季播种 ,小母株露地越冬的办法进行。这种办法虽具有投资少、种子产量高等优点 ,但种株能否安全越冬往往成为制种成败的关键。 1 998年秋冬季持续温暖干旱、蚜虫大发生 ,次年 2月2 0～ 2 3日 ,种株又突遭寒流袭击 ,南阳地区的 Most of the area south of the Yellow River in our province, the Chinese cabbage hybrids are mostly planted in autumn, and the wintering of small mother plants is carried out. Although this approach has the advantages of less investment and higher seed yield, it is often the key to the success or failure of seedling to survive overwintering. In the fall and winter of 1998, the warmth and drought continued and the aphids took place. On the following February 20 ~ February 23, the seedlings were suddenly hit by the cold surge. The Nanyang area