Thank you to the numerous clients and friends around the state who contacted the Plant & Insect Diagnostic Clinic in 2008.Â It is always good to hear from you.Â Please keep those letters, phone calls, e-mail messages and samples coming!Â We look forward to serving you in the coming year.
The PIDC provides many services.Â We diagnose plant problems from disease, insect, or abiotic factors. We identify mushrooms, insect, plants (including weeds).Â We also process soil samples for corn nematodes or soybean cyst nematode egg counts.Â
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The following are a few of the samples or questions received the past month.
We frequently mention yellowjacket wasps as beneficial predators, pests at picnics or home invaders when they nest in wall voids and attics. We have also explained how these small (one-half inch long) yellow and black wasps are related to baldfaced hornets and that both make papier-mache nests out of wood pulp and wasp spit. Baldfaced hornets produce nests outdoors on trees, posts and houses. Yellowjacket wasps build nests inside existing cavities such as holes in the ground or building walls, in decayed logs and stumps or hollow tree trunks. Seldom do we get to see the yellowjacket wasp nests, and especially not of the size of the one in the photo below, taken by Thomas Smith in central New York state after discovery during attic renovation. The nest measures 44" high and 24" wide at the base. Most impressive. Yellowjacket wasps nests are annual. That is, they are used for only one summer (May to October or November) and then never used again. Nests are empty by this late into the winter, so there is no need for control at this time. The nest can safely be scraped down and discarded.
Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on January 7, 2009. The information contained within may not be the most current and accurate depending on when it is accessed.