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Safe Aphid Control on Plum Trees: Horticultural Oil and Beneficials

Georgia's plum trees suffer aphid infestations tended by ants. Soap spray nearly killed a tree last year. Safer approach:

Recommended: Horticultural Oil

Apply dormant oil in late winter to smother overwintering eggs.
Use summer oil (lighter weight) during growing season if needed.
Follow label rates exactly—oil can burn foliage in heat.

Support Beneficial Insects

Lady beetles, lacewings, syrphid flies, and parasitic wasps devour aphids.
Avoid broad-spectrum insecticides that kill them.
Ants "farm" aphids for honeydew—control ants with sticky bands on trunks.

Local Expertise

Contact your county extension agent for region-specific timing and product recommendations. They offer free, science-based advice.

Seeding and Propagation: Plum Aphids in Curled Leaves: Atomic Grow and Pure Neem Oil; Ants on Grapefruit Tree: Sign of Pests or Dry Soil?; Controlling Aphids on Plum Trees for Healthy Foliage; Thatching Ants at Base of Large Fir Tree: No Threat to Tree Stability; Linden Tree Aphids and June Beetles: No Connection, Honeydew Stunts Grass; Aphids and Ants on Balcony Garden: Separate Controls Needed; Ants at the Base of Citrus Trees: Organic Control with Sticky Barriers; Ants on Mature Norwegian Pines: Not a Reason for Removal; Aphids on Aspen: When to Spray and How to Fertilize; Ants on Grapefruit Tree: Identify Before Treating

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