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Cottony Aphids on Young Sargent Crabapple: Identification and Control

A newly planted Sargent crabapple in Wendell, NC has white cotton-like material on branch undersides that washes off but reappears daily.

Expert Diagnosis

The symptoms indicate cottony aphids. To confirm, touch the cottony mass—if there's movement, they're insects. Honeydew (sticky liquid) on leaves is another sign.

Chemical Control Options

Numerous contact insecticides are registered for aphids: acephate (Orthene), bifenthrin (Talstar), chlorpyrifos (Dursban), diazinon, malathion, nicotine sulfate, pyrethrum, rotenone, resmethrin, and tetramethrin + sumithrin. The expert recommends Orthene as a good product. Aphids are easily killed.

Sargent Crabapple Tree

Pests: Crabapple Trunk Galls: Adventitious Roots, Not Disease; Oak Tree Dripping Sap? It's Honeydew from Aphids or Scale; Saving Heritage Crabapple Trees: Suckers vs. Cuttings; Littleleaf Linden Honeydew: Aphid/Scale Systemic Treatment; Hackberry "Sap" on Truck: It's Honeydew from Aphids/Scale; Sticky Sap Dripping from Oak: Aphids or Scale; Cottony Aphids on California Valley Oak; Crepe Myrtle Sooty Mold: Aphid Control Eliminates Black Fungus; Controlling Crabapple Suckers with Growth Regulator; Preventing Crabapple Fruit: Timing and Chemical Options

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