Aphids of Viburnum

Disease Information

Aphids

Symptoms and damage

Snowball aphids (Neoceruraphisviburnicola) most often occur on European cranberry bush and snowball viburnums. They can cause twisting and curling of the young growth. These aphid are gray to dark green and feed in clusters at the tips of the branches, causing leaf curl. They feed by piercing plant tissue and sucking plant sap.

Management

 They usually cause little or no appreciable damage. Viburnums can be sprayed with insecticidal soap or horticultural oil to control aphids. Soaps and oils must be sprayed onto the aphids to be effective. Spray the foliage thoroughly, including the upper and lower leaf surfaces. Repeat spray three times at 5- to 7-day intervals. Only apply horticultural oils or insecticidal soaps if temperatures are below 85 °F.

If higher toxicity insecticides are deemed necessary, sprays containing acephate, bifenthrin, carbaryl, cyfluthrin, lambda cyhalothrin, malathion, neem oil, permethrin or pyrethrin will control aphids. Soil drenches or granular applications of imidacloprid or dinotefuran will control aphids and last longer within the plant to prevent future infestations .

 



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