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Green Giant Arborvitae Aphid Infestation: Systemic Control Options

New Green Giants infested with small white/gray flying insects (aphids). Owner has sprayer, asks best treatment.

Systemic Insecticides (Best for Coverage)

Imidacloprid (Bayer Advanced Tree & Shrub / Merit): soil drench, moves to foliage. Long residual.
Acephate (Orthene/Isotox): foliar systemic, good coverage.
Dimethoate (Cygon): foliar systemic for evergreens.
Disulfoton (DiSyston): soil granules, older/more toxic.

Contact Sprays

Acephate, bifenthrin, malathion, etc.—require thorough coverage, repeated applications.

Soil systemic preferred for large plantings—easier, thorough, longer control.

Conifers: Leyland Cypress Alternatives: Why Green Giant Arborvitae Is Superior; Thuja Green Giant in Austin: Not a Shade Tree, But a Great Screen; Green Giant Arborvitae Interior Browning: Transplant Shock or Spider Mites; Fertilizing Green Giant Arborvitae in Pennsylvania; Green Giant Arborvitae for Shade Under Loblolly Pines; Why Green Giant Arborvitae Die: The Wire Basket Mistake; Green Giant Arborvitae in Partial Shade: Will They Work?; Leyland Cypress vs. Hemlock vs. Thuja 'Green Giant' vs. 'Steeplechase' for Privacy Hedges; Thuja Green Giant Life Expectancy vs. Leyland Cypress; Green Giant Arborvitae Shade Tolerance

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