Answer: Curled leaves on a snowball viburnum is quite common and generally due to aphids feeding early in the season. If you can control the aphids, you can control the curl. Begin inspecting the leaves as soon as they unfurl, and hose off any aphids you find. Their feeding will distort the leaves, and the pests are often long-gone before the damage is discovered. Another cause of curling leaves can be leaf-rolling caterpillers. To reduce the population, pick off the curled leaves and squish them. You'll be getting rid of the pest, plus the next generation of leaf-rollers.
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