Causes of yellow leaves of potted flowers and methods of preventing flower diseases and insect pests

Due to the limitation of cultivation conditions and improper daily management, potted flowers are prone to the phenomenon of yellow leaves, which will affect the normal growth and die of the whole plant. Therefore, in the process of maintenance, attention should be paid to observation, correct judgment, and understanding of the causes of yellow leaves. Take corresponding countermeasures and correct them quickly.

Watering too much basin soil for a long time makes the roots suffocate and rot, can not absorb water and fertilizer normally, resulting in yellow leaves and even fall off. When it is found that there are yellow leaves, you should immediately stop watering, loosen the basin soil and put it in a ventilated and dry place to speed up water evaporation. Watering should adhere to the principle of seeing dry and wet, watering thoroughly, and do not water sporadically. In addition, do not spray water on the flowers during flowering.

If the leaves droop due to lack of water, you should immediately spray water on the leaves to speed up the absorption of water by the plant, and then water the basin. At this time, pay attention to less watering, so that the soil can be moist, do not water more.

Improper fertilization in potted peanuts for a long time, long-term non-fertilization or insufficient fertilization, etc., will cause yellow leaf phenomenon; applying too much concentrated fertilizer will burn the roots, affect water absorption, and also cause yellow leaves, which can be diluted and washed away from the soil. The lack of fertilizer can lead to basin soil hardening, leaves yellow, thin, thin, branches slender, yellow, tender, should be fertilized immediately.

Alkali is large because potted flowers are watered for a long time, and saline-alkali is accumulated in the potted soil, which will lead to the yellowing and shedding of flowers and leaves. Better results can be achieved by replacing new soil or spraying ferrous sulfate solution to the leaves, spraying alum fertilizer water and fermenting rice water, but do not apply more.

Some air-dry flowers cultivated in the north like air-wetting flowers, such as camellias and orchids, tend to dry up the leaf tips, scorch the leaf edges or scorch the leaves, and the edges curl and wrinkle and turn brown when the air is too dry. Especially in the areas where indoor coal fire and heating are used in winter, the disease is more serious. At this time, water close to room temperature should be used to wash branches and leaves to increase air humidity.

Large flower pots, small flowers and large roots, need more water and fertilizer, small pots can not meet the needs of plant growth, old leaves are dry and yellow, and tender leaves are yellow and thin. To change the appropriate size of the basin, 30% humus soil should be added to the soil to make the flowers grow normally.

When the branches and leaves are too dense, the branches and leaves grow luxuriantly and have not been pruned for a long time, which makes the inner bore branches lack of light, resulting in the phenomenon of leaf yellowing and shedding. Pruning the inner bore branches should be strengthened to facilitate ventilation and proper fertilization.

Lack of light to cultivate sunny flowers, such as rose and pomegranate, if they are placed in places where the light is too weak for a long time, the plants will gradually weaken, the leaves will be thin and yellow, and they will not bloom or bloom less. It should be moved to a place with plenty of light.