Question: Six-year-old Chinese pistache in Phoenix weeps black sap at multiple trunk spots. Neighbor suspects borer. Other tree unaffected. What to do?
Two likely causes:
Look for entry holes. If found, spray Merit (imidacloprid) on affected trunk areas—it translocates and kills larvae.
Bacterial infection causing dark, frothy, foul-smelling sap from cracks. No cure, but stress reduction helps. No smell? Leans toward borer.
Fertilize with 10-10-10 at 1 lb per inch trunk diameter to improve vigor and resistance to both issues.
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