There is a layer of mucus around the nymph of the pear wood lice, and the conventional medication affects the control effect. The filtrate was leached with 3% ash, and then sprayed on trees damaged by pear wood hoe. After 3-4 hours, the mucilage of the nymphs coated with leeks could be completely dissolved so that the nymphs could be exposed, and then sprayed to prevent lice. Pesticides, the control effect is greatly improved.
Preventing fruit tree pear hibiscus with plant ash