Many leaves in this shrub -- Viburnum lentago (originally IDed as Viburnum cassinoides) were folded and sealed by a small caterpillars. Do the cocoons drop to the ground when formed? I've checked a number of these folded leaves after the caterpillar has been inside and grown and have never found a cocoon although the leaves were still folded. However one end of each of the folded leaves has been eaten away. I noticed that the cocoons were formed outside of the leaves in the samples I collected.