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1.徒长。它的特征是茎细弱,叶片薄,叶色淡绿,组织柔嫩,根系不发达,定植后缓苗慢,成活率低,花芽分化晚且不正常,花芽数量少,畸形花和弱小花多,易脱落,观赏性差。防治措施:①预防,主要是增加光照和控制苗床温度。当幼苗生长拥挤时,及时间苗、分苗,防止过分遮荫,即使在阴冷天,也要适当揭开覆盖物,使幼苗见光充分。要按照幼苗各个阶段生长发育的需要严格控制苗床温度。②补救,主要是控制浇
1. leggy It is characterized by thin stems, thin leaves, light green leaves, soft tissues, underdeveloped roots, slow seedlings after planting, low survival rate, late flower bud differentiation and abnormal, fewer flower buds, deformities and weak flowers, Easy to fall, ornamental poor. Control measures: ① prevention, mainly to increase the light and control the temperature of the seedbed. When the seedlings grow crowded, and time seedlings, seedlings, to prevent excessive shade, even in a cold day, but also appropriate to uncover the cover, so that young seedlings see the light. Seedlings in accordance with the various stages of growth and development needs of strict control of seedbed temperature. ② remedy, mainly to control pouring