Mold in the process of growing vegetables on paper is caused mostly by seeds with rags, mold, and loss of germination power rotting and molding under high temperature and high humidity conditions. Good seeds can also mold in the case of prolonged immersion in water, poor aeration, too high or too low temperature.

Prevention methods: selection of good seeds, eliminating inferior seeds; germination must be strictly control the amount of watering and temperature, do not stagnant water, to maintain the appropriate temperature, humidity and ventilation. In addition, the seedling tray must be strictly cleaned and sterilized