July 13, 2011
The following are highlights and updates about samples and questions recently received in the Plant & Insect Diagnostic Clinic:
If your Siberian elm has leaves that look like they have been blasted with a shot gun then it is probably being fed upon by a tiny, new insect called the European elm flea weevil, Orchestes alni. USDA identifiers confirmed the first state record of the European elm flea weevil in Iowa on July 13 based on samples submitted to the ISU Plant & Insect Diagnostic Clinic from Tama County, Iowa, and forwarded to the USDA/APHIS/PPQ for confirmation. However it is probable that European elm flea weevil has been in Iowa for a number of years.
Japanese beetle adults have begun to emerge in full force and defoliation of linden trees, grapevines, cannas and other plants is now apparent in many places. For more about the start of
Have you noticed any gum oozing from cherry tree branches and trunks? It's called gummosis, a sign that your cherry tree is under some sort of stress. That's right, trees can get stressed!