My Pyracantha has been attacked last year and is continueing to be seriously affected by a tiny caterpiller type creature that is found on the leaf, usualy just one per leaf. It seems to be in the leaf and causes the top fine skin of the leaf to lift or separate from the leaf like a flat blister. If I peel back the blister I will fine one of these creatures, just a few millimeters long, brown or black head and very thin, less than a millimeter thick. The whole shrub is affected and looks at first sight as if it has been splashed with water used to wash out a concrete mixer, some leaves are almost all white on one side only and some only partially white, when you peel off the dead skin of the blister, the leaf inside shows very little damage. What is this and how can I prevent the infestation.
- 14 Feb, 2010