August 21, 2015
The Iowa State University Plant & Insect Diagnostic Clinic frequently receives inquiries regarding trees with foliar chlorosis (yellow leaves), browning from the edge of the leaf in, and wilting appearance of limbs or whole sides of a tree. Trees and ornamental shrubs can suffer from vascular wilt pathogens. These pathogens enter the vascular system that move water from the roots upwards. The pathogens then colonize the vascular system, and impeded water movement to the branches, resulting in yellowing and browning of the leaves, and the wilted look of twigs and limbs.
The emerald ash borer, a destructive and invasive insect of ash trees, has been discovered in central rural Montgomery County. Iowa’s growing number of counties with confirmed detections has now reached 27.
Grapes are a delicious and nutritious part of any garden, but there are variables involved when properly harvesting and storing them. See the Iowa State University Extension and Outreach Yard & Garden news release from August 20, 2015 for tips on how to get the most out of your grape harvest.
Pumpkins are one of the fun crops in the vegetable garden. Pumpkins make delicious pies and other desserts. The fruit can also be painted, carved into jack-o'-lanterns, and used in fall decorations.
Below is the summary of recent mosquito activity in Iowa from the ISU Medical Entomology Laboratory. Mosquito surveillance data can be viewed online at www.mosquito.ent.iastate.edu
The following are highlights and updates about samples and questions recently received in the Plant and Insect Diagnostic Clinic.