What is the matter with the tender leaves of banyan trees withered and curled?
As a common landscape plant, banyan trees often trouble growers when their young leaves are scorched and curled. This phenomenon not only affects the ornamental value, but also is an important warning signal for plant health. This paper will systematically analyze the three main causes of blade abnormalities and provide scientific prevention and control plans. Leaf abnormalities caused by pest invasion. When new leaves are found to be horizontally curled with charred characteristics, the back of the leaves needs to be inspected immediately. Piercing and sucking pests such as scale insects and red spiders often gather on the back of leaves. The honey dew they secrete can cause coal pollution disease. Double damage causes the leaves to lose green and curl. It is recommended to spray 10% imidacloprid wettable powder at 2000 times every week, focusing on the leaf back area. Environmental mutations lead to a sudden increase in light intensity in stress reactions. It is a common cause: long-term shaded plants are suddenly exposed to strong light, leaf transpiration rate exceeds the water absorption capacity of the roots, and leaf margins appear scorched within 2-3 days. The principle of "progressive" light adaptation should be followed, adding 1 hour of direct light per day. At the same time, keep the air humidity>60%, and you can use leaf atomization in the morning and evening to replenish water. Improper maintenance operations cause chemical damage. Direct contact of high-concentration foliar fertilizers (>0.3% urea solution) with young leaves will cause osmotic stress, and burn spots will be visible within 24 hours. The selection of pesticides needs to avoid sensitive components of banyan trees (such as organic phosphorus), and it is recommended to use biological agents. Fertilization should follow the principle of "thin fertilizer and frequent application", and a balanced water-soluble fertilizer diluted 1000 times should be applied every month in spring and autumn.
Through the three-pronged approach of pest control, environmental control, and scientific maintenance, more than 90% of leaf abnormalities can be effectively prevented. It is recommended to establish a maintenance log to record temperature and humidity changes, fertilization and medication details, so as to facilitate tracing the root cause of the problem. Regular pruning to keep the crown ventilated can reduce the incidence of pests and diseases.