What are the control methods for bacterial shot hole disease in peach trees?

(1) Damage symptoms.

Peach bacterial shot hole disease mainly damages peach leaves, and also infects twigs and fruit. After leaves are affected, nearly round or irregular brown lesions appear, and the lesions gradually dry up and fall off to form shot holes, hence the name shot hole disease. In severe cases, several lesions often join together to form large scorched patches, causing most of the leaf to dry up and resulting in early defoliation, so the disease is also called peach early defoliation disease.

(2) Control methods.

1. Strengthen comprehensive management of the peach orchard. Apply more organic fertilizer, avoid excessive application of nitrogen fertilizer, pay attention to orchard drainage, and prune reasonably, so that the peach orchard has good ventilation and light penetration, promotes robust tree growth, and improves disease resistance. 2. Thoroughly remove dead branches, fallen leaves, and fallen fruit, and burn or bury them deeply in a centralized manner to eliminate the source of primary infection inoculum; 3. Chemical control. Before peach trees sprout, spray once with 4-5 degrees Baume lime sulfur mixture or 70% Solibar 50-80 times dilution, or spray 1:1:100 Bordeaux mixture. During the growing season, spray 65% zineb wettable powder 500 times dilution, or 10% Junlike aqueous solution 800 times dilution, or 70% Solibar 150-200 times dilution, or zinc sulfate lime solution (1 part zinc sulfate, 4 parts slaked lime, 240 parts water, fully mixed) for control.