Pay attention to the physiological diseases of leaves

Leaf disease:

1. The color of the leaves turned yellow and green, and all other parts were normal.

Cause: the sunshine is too strong.

two。 The leaves turn yellow, and the new buds grow slowly and small, but do not shrink.

Cause: insufficient nitrogen fertilizer.

3. Except for the normal new leaves, the other stems and leaves turned yellow and the pseudocorms atrophied and wrinkled.

Causes: too much watering, improper basin change or root damage.

4. The leaves are purplish red, especially the new leaves.

Etiology: caused by low temperature injury or lack of phosphate fertilizer.

5. The old leaves yellowed and fell off.

Etiology: normal aging or basin replacement transplantation.

6. The tip of the new leaf is scorched, and when it is severe, it dies to the base, and the root of the basin dies, but it is not infected.

Cause: excessive fertilization or improper use of fertilizer caused fertilizer damage, plant material salt accumulation too much, should stop fertilization, flushing plant material.

7. The leaves are scorched in dark brown patches with yellow circles around them.

Etiology: sunburn caused by too strong light, poor ventilation is more likely to occur.

8. The leaves quickly shrunk and turned gray-green, and the pseudocorms also gradually shrunk.

Cause: too much watering or poor drainage, root damage, should increase air humidity.

9. The leaves shrunk slowly, the old leaves gradually yellowish green, fell off seriously, and the old pseudocorms shrank.

Etiology: the plant material is too dense or poorly ventilated, lack of nitrogen fertilizer or too large basin. (Xue Congxian)