NEW GUINEA IMPATIENT
The odd growths on this New Guinea Impatient may look like weed killer problems, but is a common symptom of a broad mite infestation. These very tiny mites infest the growing points; cause stunting, twisting and distortion; and affect a number of annuals and perennials. For more detailed information see http://www.uwex.edu/ces/wihort/gardenfacts/XHT1038.pdf.
Western Ash Plantbug nymph
WESTERN ASH PLANTBUG
The dark brown critters causing the spots on Ash are the Western Ash Plantbug. This is the first time I have seen this species, but the green Eastern Ash Plantbug is a common May and June Problem. Heavy feeding causes spotting, burning and even leaf drop. For control see http://cecommerce.uwex.edu/pdfs/A3126.PDF.
Western Ash Plantbug feeding
OLD HOUSE BORER
A new state record, a critter called an Old House Borer, was found infesting timbers shipped in from the east coast in a home in the Oshkosh area. What makes this insect unusual is it can continue to breed in wood if the conditions are right. It is found in the Northeast U.S. , but has a difficult time in Wisconsin because of the major dryness found in our homes in the winter.
Pear Leaf Blister Mite
The most common problem last week was pear leaf blister mite damage. The tiny eriuophyid mites cause a small blister that will eventually turn brown on the leaves. The damage is mostly cosmetic but in heavy populations it can cause russeting on the fruit. Once you see it, it is too late to treat for this season. Dormant treatments or spraying at bud break with carbaryl can be considered for next year. See also http://www.entomology.wisc.edu/diaglab/02hilite/5_21.html.
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