How to control pests and diseases in landscaping in spring.

Common pests of begonia pendula and their control. Nymphs and adults of this insect gather on leaves and branches to suck flower juice, which weakens the tree, affects the photosynthesis of flowers and trees, and aggravates the harm.

Common pests of begonia pendula include Ceratoides, apple aphids, red spiders and so on.

(1) Ceratoides. Nymphs and adults of the insect concentrate on leaves and branches to absorb flower juice, which leads to the weakness of trees, affects the photosynthesis of flowers and trees, and aggravates the harm.

Control methods: ① Combining pruning, cutting off branches with insects, and centralized burning to reduce the wintering base. (2) Scrape off bugs with bamboo chips or wipe them off with sacks. ③ Spraying Hua Le 20% Cyanopent Marathon or 49% omethoate EC at the nymph stage, 7 days 1 time;

(2) Apple aphids. This kind of insect is clustered on the back of leaves and tender tips, which is harmful to flowers. At the initial stage, the leaf edge rolled downward, and then curved horizontally from the tip to the petiole, which affected the growth of new shoots and flower bud differentiation.

Control methods: ① Spraying Bomei 5-degree stone sulfur mixture before plant germination to kill overwintering eggs. ② During the aphid damage period, spraying Hua Le 20% Cyanopentine Marathon or 50% Parathion EC 2000 times for control.

(3) Starscream. Red spider, also known as Ye Zeng, often sucks both sides of the leaves, which makes the leaves dry and fall off, affecting the growth of the whole plant.

Prevention and control methods: ① In winter, carefully find out miscellaneous skins, diseased plants and diseased leaves and burn them. (2) Dilute the spray with 3.2% avermectin and pyridaben.

In addition, the common diseases of begonia pendulous are the same as those of begonia sessile, which can be used as reference for prevention and control.