1. Insufficient supply of soil water can not meet the growth and development needs of cypress trees, resulting in thin or wilting leaves and yellow tips, leading to early defoliation. Or the drainage is not smooth, the soil accumulates water, causing the roots to anaerobicly breathe for too long, accumulating too much alcohol, poisoning rotten roots. Or soil compaction, poor ventilation, resulting in yellow leaves.
2, planted too dense, poor ventilation and light transmission, the plants compete for fat, water, shade, affecting photosynthesis, respiratory consumption, resulting in yellow leaves, leading to early leaves.
3. Improper management of the field. If the seedlings are damaged, the roots are planted, the animal bites the branches or the human is wounded, causing yellow leaves. The pathogenic fungus is mainly an infecting cypress tree in the genus Alternaria, which causes leaf blight.
4, underground pest bites seedling bark is also easy to cause yellow leaves.
5. The yellowing of the leaves caused by lack of fertilizer or fertilization is unreasonable.
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