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
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.
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 .