Prevention and control methods:
1. Clear pines and cypresses from the pear orchard within 5km. If it can't be removed, pine and cypress should be sprayed with 3 ~ 5 Baume sulfur mixture L ~ 2 times before pear trees germinate every spring to eliminate overwintering bacteria.
2. Apply pesticides within 25 days after pear trees germinate and bloom. If there is much rain, spray 1 time before flowering and 1 time l ~ 2 times after flowering. Medicament: 25% triadimefon powder or emulsion 3000 ~ 4000 times L ~ 2 times. After June, spray 65,438+0: 2: 240 Bordeaux mixture, and spray 65,438+0 times every L5 ~ 20 days for 3 ~ 4 consecutive times.