Symptom Identification and Control Methods for Peach Fungal Shot Hole Disease

[Symptoms]

When leaves are infected, circular or nearly circular lesions initially appear, with purple edges and slight concentric rings, measuring 1-4 mm in size; later, grayish-brown mold-like growth develops on the lesions, the center dries up and falls out, forming shot holes with neat edges, and when there are many holes, the leaves drop off. When new shoots and fruit are infected, the symptoms are similar to those on leaves.

[Disease Development Pattern]

[Regional Damage Severity]

[Integrated Control]

(1) Eliminate the source of inoculum. Promptly prune diseased branches, thoroughly remove diseased leaves, and burn or bury them deeply. Before peach trees bud, spray once with 80% sodium pentachlorophenate at 300 times dilution. If overwintering pests also need to be controlled, 3-5 degrees Baume lime sulfur mixture can be added for mixed use. The best time to spray is when the peach buds' scales are swelling but have not yet revealed green tender tissue.

(2) In early spring, spray 50% thiophanate-methyl wettable powder at 500 times dilution or 70% mancozeb dry suspension powder at 500 times dilution, 50% benomyl wettable powder at 1500 times dilution, 1:1:100-160 formula Bordeaux