1Received for publication January 6, 1979. Mention of a commercial or proprietary product in this paper does not constitute an endorsement of this product by the USDA.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
2Research in cooperation with the College of Agricultural and Life Sciences, University of Wisconsin, Madison 53706.
3Research Entomologist and Research Horticulturist, respectively.
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