Dan said:


Small 1/4" long black caterpillar wiping out the leaves of two new
shrubs I purchased 6 weeks ago. The caterpillars looks very similar
to the virburnum leaf beetle larvae that have decimated the highbush
cranberries around here (this is zone 5 microclimate in northwest NJ).
However, they are black instead of the whitish color of the VLB larva.

The c. alnifolia plants were fresh and vibrant when I got them from
Edge of the Woods Nursery in Allentown, PA. The caterpillars have
wiped out the new bright-green growth to the stems (similar to
virburnum leaf beetle damage) and are now attacking the older
dark-green growth. Fresh growth is sprouting, but the caterpillars
are quickly attacking and destroying it.

Could be sawfly larvae. Sawflies, scale and spidermites are the only
pests I recall being mentioned for Clethra.

A gallary of sawfly larvae photos:
http://www.pbase.com/tmurray74/sawfly_larvae
--
Pat in Plymouth MI

"Vegetables are like bombs packed tight with all kinds of important
nutrients..." --Largo Potter, Valkyria Chronicles

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