Control methods of deciduous leaves of banyan bonsai

The fallen leaves of healthy banyan trees just purchased are mostly due to lack of nutrition, tree potential decline, induced by habitat mutation (such as temperature, temperature, light, etc.). If long-term cultivation of fallen leaves in the basin, we should also consider the lack of soil fertilizer, alkalization or diseases and insect pests and other factors. The prevention and control measures for this situation can be summarized as follows:

First, when you buy, you should choose the leaves to stretch, the bright green, the whole plant free from diseases and insect pests, and the cultivation soil should be loose, fertile and breathable.

Second, to be placed in a brighter room, the temperature is between 10 ℃ and 30 ℃ and does not change much, no less than 5 ℃ in winter and no more than 35 ℃ in summer, and pay attention to ventilation and often spray water to the leaves. After Grain Rain and in front of Cold Dew, it can also be kept outdoors and slightly shaded in summer. Be careful to stay away from heat sources in a dry room, especially at low temperatures.

Third, apply thin fertilizer frequently, apply more thin cake fertilizer water or alum fertilizer water, irregularly spray 0.3% urea water, 0.3% potassium dihydrogen phosphate solution, etc., do not apply thick fertilizer.

Fourth, actively prevent and control diseases and insect pests. The root can be irrigated with 14.5% water-soluble powder 150 times to 200 times, or 20% Tuba wettable powder 500 times, once every 20 days. 3% furan granule was applied to the root, 5 g to 10 g per plant, and pest control was carried out every 20 days. Foliar spraying 1200 times of methyl topiramate wettable powder to control leaf diseases.

Fifth, prevent fallen leaves. Can be sprayed with 50 mg / kg of cytokinin, 0.01% Fuzi 300 times to 400 times solution, once every 15 to 20 days. In the vigorous growth period of spring and autumn, 15% paclobutrazol wettable powder can also be sprayed 300 times to 500 times once or twice. It can also be sprayed with 200 times of high-fat film concentrated emulsion when the air is dry or dry. Before changing the environment or in order to strengthen the tree, you can use 5ppm to 10ppmABT3 rooting powder solution to irrigate roots.

Sixth, control the fallen leaves. Once the banyan tree has fallen leaves, it can be sprayed with 95% anti-falling element wettable powder 50000 times, plant cytokinin 0.4% wettable powder 800x liquid and so on. In the case of sufficient fertilizer and water, gibberellin can also be sprayed 20 mg / kg water control, serious cases can be once or twice a week. At the same time, the disease should be treated from the comprehensive consideration of soil, fertilizer, water, pipe and so on.