July 25, 2007
This concludes our "summer season" of weekly publication of the ISU Horticulture and Home Pest News. There will be two issues in August and then one issue monthly through the winter (September through January). The next issue will be in two weeks, August 8. See you then.
One of the largest insects in Iowa is the dobsonfly (Corydalus spp., Neuroptera: Corydalidae), an aquatic insect from rivers and streams that is frequently found in town. These prehistoric-looking creatures measure two to four inches from the front of the head to the wing tips. They are soft-bodied and brownish-gray with the wings held roof like over the body. The wings have a large number of veins (lines) and are often mottled. The antennae are long and threadlike. A distinguishing characteristic is the mandibles.
Samples with the following problems have been seen in the Clinic lately:
Environmental stress on many plants (see this week's article)