Garden Pests and Diseases: Euonymus Manhattan leaf curl, 1 by ltalent

ltalent wrote:
Our euonymus has never had a problem. It was taken from a local park and plunked in a large container (2' x 6') where it's thrived for nine years. Last fall, admittedly drier than normal, its leaves started to curl inward. There is no sign of insects and aside from one small branch, pictured here, no browning. The euonymus next to it showed no symptoms until this week, and now it is starting there too. The nursery guys didn't have any suggestions other than mineral deficiency (I fertilized) and the gardeners in Central Park, which has many many euonymus hedges, had never seen it before. They were stumped.

It is possible that someone threw something in the planter as it is available to passersby, but it seems strange that it would last 8 months and then spread to the next plant.

Ideas?