Mallow Hardy Hibiscus insect problem
At the start of this season I planted a Turn of the Century Mallow Hardy Hibiscus and everything was going well until a few weeks ago. The plant was blooming and then one day nothing. Upon inspection it looked for all intents and purposes like someone had taken a pair of pruning shear and cut the stems behind every bud cluster. That is how clean the "cut" was.
Doing my own research the only pest of hibiscus that I could find is the Sawfly. However my research indicts that the damage done by Sawfly larve is the skeletonization of the leaves. The leaves on my plant are fine and do not exhibit any damage, other then a few which do exhbit some chewing damage, but hardly what I would call skeletonizing. Does neighbor who also had a first year Hardy Hibiscus encountered the same problem? Yet few blocks away all hardy hibiscus plants contunied to bloom. Does anyone know what insect I'm dealing with here so that I could be prepared for next year?