During the growth and development of flowers, the diseases caused by unsuitable environmental conditions are called physiological diseases. The diseases caused by insufficient nutrients are mainly dwarf and chlorosis. The lack of nitrogen in plants can not guarantee its high growth; due to soil over-alkali (north) or peracid (southern), the plants are weak, the leaves are scorched; phosphorus deficiency, potassium deficiency and other trace elements can also cause the flowers to chlorotic and wither. Water shortage during flower growth and development will cause withering and dwarf; excessive water, root respiration will be rotted, and plants will be yellow. Therefore, when the leaves are yellow and wilting, take careful measures before taking measures.
Soil and air temperatures are too high or too low, which can also cause physiological diseases. The soil temperature is too high, and the affected part is softened, dried and atrophied, especially the flower with thin roots and thin skin is vulnerable. The sunburn caused by excessive light, forming a water-soaked lesion on the sunny side of the base of the stem, and slowly splitting.
Diseases caused by low temperature (such as frost damage, frost damage, etc.) are generally prone to occur when the temperature difference between day and night in early spring is large, and the damaged leaves, flowers, fruits are yellow, dry, shedding or leaves, and the stems are curled; Flowers in the frost area, such as white orchids, jasmine, etc., are killed by frost.
In addition, the harmful exhaust gas emitted from factories, automobiles, etc., will also cause the leaves to discolor and fall off.
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