Among some of the key findings: soil tests conducted in landscapes treated with Imprelis in 2011 did not yield quantifiable levels of Imprelis. This indicates that Imprelis in affected landscapes has broken down to the point that it should be safe to replant these areas.
On the other hand, mulch made by grinding Imprelis-affected trees significantly affected growth and development of tomato plants in greenhouse trials. Therefore, debris from Imprelis-affected trees should be disposed of and not used for mulch.
Read the fact sheet: 2013 Imprelis Update: Tree Maintenance, Replacement, and Disposal