American Plum Borer in Old Purple Plum: Merit Spray + Fertilize

Treatment

Spray trunk wounds and adjacent bark with Merit (imidacloprid) now and in 30 days. Kills larvae inside.

Fertilize with 10-10-10 at 1 lb/inch trunk diameter now and early fall. Reduces stress that attracts borers.

Trees: Dealing with Borers in Plum Trees: Identification and Treatment; Plum Tree Leaf Curl and Eggs: Beneficial vs. Pest Identification; Plum Tree Base Bumps: Normal Callus or Canker?; Ornamental Plum Delayed Leaf-Out: Environmental Stress vs. Fatal Decline; Flowering Plum Died After Sucker Pruning: Regrow from Base; Plum Tree Borers: Systemic Insecticide, Nematodes, and Tree Vigor; Plum Tree Pruning for Fruit Production; Protecting Ash from Emerald Ash Borer in Illinois; Peach Tree Borer Fatality in Mature Plum Tree; Flowering Plum Tree Guide: Varieties, Care, and Pruning

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