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Raywood Ash Honeydew: Scale Insect Control

Diagnosis

18-year-old Raywood ash dripping sticky sap on decks/pavers with no visible aphids = soft scale infestation. Scales are tiny, immobile, and blend with bark—easily missed.

Scale Biology

Live under waxy covers; suck twig sap.
Excrete honeydew → sooty mold, ants, wasps.
Ants protect scales from predators.

Systemic Solution

Apply Bayer Advanced Tree & Shrub Insect Control (imidacloprid) as soil drench. Roots translocate to twigs/leaves—scales die when feeding. Takes 2+ weeks to reach canopy top.

Product: Bayer Advanced Insect Control

Why Spraying Fails

Mature ash too large for coverage; scales protected under shells. Soil drench is the only reliable method. Honeydew stops; decks stay clean.

Trees: Scale Insects on Cattleya: Alcohol Removal and Systemic Treatment; Raywood Ash Slow Growth: Addressing Root Girdling and Fertility; Scale Infestation on Raywood Ash: Blackened Branches Explained; Pool Deck Lifting: Raywood Ash Roots vs. Queen Palm; Raywood Ash Leaf Drop in Phoenix: Normal Winter Dormancy; Planting and Pruning Raywood Ash: Avoid Topping!; Maple Tree Dripping Sticky Sap? It's Likely Slime Flux, Not Aphids; Maple Honeydew on Property: Systemic Scale/Aphid Control; Raywood Ash Sprouts After Breakage: Rootstock Identification; Oak Scale Infestation: "Raining Sap" and Bumpy Limbs

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