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What causes notching or scalloping of the leaves and chewing of the bark at the base of the stem of azaleas?
Ginezumi
Adult weevil damage typically is seen in notching or scalloping of leaves and chewing of the bark at the base of stems. Leaves often may be left yellowed, drooping or curled. In terms of azaleas, the weevil in question is either the black vine weevil [Otiorhynchus sulcatus] or the strawberry root weevil [Otiorhynchus ovatus].
Adult weevils are black or gray. They have quite noticeable 1/4 - 3/8 inch [0.635 - 0.9525 centimeter] snouts by which they feed. They will be found on the leaves for night-time feeding. So it's later in the day they can be controlled by treatments with the active ingredient acephate, if need be every three weeks summer through September.
The larval stage also feeds on azaleas. They cause even more damage than the adults. The 1/4 - 1/2 inch [0.635 - 1.27 centimeter] legless grubs are in the soil, to feed on the azalea's roots. So that's where they'll be controlled by a soil drench, such as with imidacloprid.
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