What are the common symptoms of physiological disorders in flowers and ornamental plants?

The symptoms of physiological disorders in flowers and ornamental plants are sometimes not easy to distinguish from certain infectious diseases, especially viral diseases. The main symptoms of common physiological disorders are:

1. Leaf discoloration

The leaf color becomes lighter, or turns yellow or white, or red, yellow or purple spots appear. If some nutrient elements are deficient, it is very easy to cause leaf discoloration in plants. For example, when a plant lacks iron, the new leaves will become chlorotic; a lack of manganese causes yellowing of the mesophyll and the formation of small yellow spots; a lack of phosphorus and potassium will also cause the leaves to lose green color and wither.

2. Wilting

For example, if a plant is not watered enough, it will wilt; on the contrary, if the potting soil is waterlogged, the plant roots lack oxygen, which affects respiration and also affects the roots' water uptake, and the plant will also wilt.

3. Necrosis

Localized necrosis in the plant produces dead spots. For example, the most common symptoms caused by cold damage to flower and ornamental plants are discoloration, necrosis and the appearance of spots on the surface; a lack of the nutrient element boron will cause the base of young leaves to rot and become necrotic.

4. Leaf drop, flower drop and fruit drop

For example, drastic changes in temperature and drastic changes in light intensity can both cause leaf drop; a lack of the nutrient element phosphorus will lead to premature leaf drop; phosphorus deficiency can also cause flower drop and bud drop; after flower bud differentiation, improper watering and soil that alternates between dry and wet can also easily cause bud drop and flower drop.

5. Stunting, excessive elongation, small leaves or small fruits

For example, a lack of the nutrient element magnesium will cause the plant to become stunted; a lack of the nutrient element sulfur will also make the plant short and small, with leaves becoming slender; a lack of the nutrient element nitrogen makes the leaves smaller, but too much nitrogen will cause excessive elongation of the plant; insufficient light will also cause excessive elongation of the plant.