Received for publication November 14,1977.
Research Entomologist, Research Horticulturist, and Research Entomologist, respectively, U. S. Vegetable Laboratory, Agricultural Research Service. This paper reports the results of research only. Mention of a proprietary product does not constitute a recommendation or endorsement by the U. S. Department of Agriculture.
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.
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