The Purdue Plant and Pest Diagnostic Laboratory

PPDL Picture of the Week for
January 16, 2012

Imprelis Herbicide Injury: 2011 PPDL Host List

Gail Ruhl, Sr. Plant Disease Diagnostician, Purdue University

We have received questions pertaining to susceptibility of plants to Imprelis.  We do not have a list of "susceptible vs. not susceptible" plants because we do not know exactly which plants might be affected under certain growing conditions. However, based on our experience in the PPDL this past summer the list below contains the names of plants on which we saw symptoms of herbicide injury when Imprelis was reported to have been applied on the property. There is no certainty that all of the damage observed on these plants listed below was actually caused by Imprelis. Confirmation of Imprelis injury will depend on the residue analysis and final reports provided by the Office of Indiana State Chemist (OISC). An asterisk (*) next to the plants listed below indicates that Imprelis residue was confirmed in host tissue by the OISC. In a few cases we also saw herbicide injury symptoms on annuals (tomato) and perennials but those have been omitted from this list.

For more information on the Imprelis situation, please see our previous article.

Conifers
Arborvitae *
Bird’s nest Spruce*
Bald cypress *
Colorado blue spruce*
Concolor fir
Dawn redwood
Douglas fir
Eastern white pine *
Fraser fir
Juniper
Norway spruce*
Yew

Deciduous trees or shrubs
Alder
Amelanchier
Boxwood
Callery Pear
Cottonwood
Euonymus
Ginkgo*
Hibiscus*
Honeylocust*
Lilacs
Maple *
Mulberry
Paulownia*
Paw Paw
Privet *
Redbud
River birch
Rose of Sharon
Sycamore
Tulip Poplar
Viburnum
Willow*

Click image to enlarge

Blue spruce

Ginkgo

Honeylocust

Alberta spruce

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service