Try this effective formula for controlling pear psyllids

In mid-March, during the peak emergence period of overwintering adults, spray 90% acephate (Nuodeshi) soluble granules at 1500-2000 times dilution for control; when pear psyllids occur severely, spray 240g/L spirotetramat at 4000-5000 times dilution or 90% acephate (Nuodeshi) soluble granules at 1500-2000 times dilution for control.

1. Acephate: an oral insecticide with stomach-poison and contact action, and it can also kill eggs. It is suitable for vegetables, tea trees, tobacco, fruit trees, cotton, rice, wheat, rapeseed and other crops, controlling various chewing and piercing-sucking mouthpart pests, pest mites and sanitary pests.

2. Spirotetramat: has two-way systemic translocation properties, and can effectively control various piercing-sucking mouthpart pests, such as aphids, thrips, psyllids, mealybugs, whiteflies and scale insects. The main crops it can be applied to include cotton, soybean, citrus, tropical fruit trees, nuts, grapes, hops, potatoes and vegetables.