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THE IMPACT OF THE RED IMPORTED FIRE ANT SOLENOPSIS INVICTA BUREN HYMENOPTERA FORMICIDAE ON SOYBEAN ARTHROPOD PESTS AND THEIR ASSOCIATED NATURAL ENEMIES IN GEORGIA by MICHAEL PAUL SEAGRAVES Under the direction of Dr Robert M McPherson ABSTRACT A two year study was undertaken to examine the impact of Solenopsis invicta Buren Hymenoptera Formicidae suppression on soybean pests beneficial predators and crop yield Three treatments were examined an untreated control Amdro hydramethylnon bait and chlorpyriphos in combination with Amdro The treatments were successful in suppressing fire ant foraging and abundance in the treated plots This led to decreased predation on lepidopteran eggs and pupae An increase was seen in the threecornered alfalfa hopper Spissistilus festinus Say and lady beetles in the treated plots In 2000 pitfall monitoring revealed ground dwelling spiders were more abundant in the untreated control Earwigs were more abundant in both years in the chlorpriphos Amdro treatment and at times the Amdro alone treatment The residual toxicity of acephate chlorpyriphos methomyl and l cyhalothrin on fire ant workers was investigated and dose mortality curves were developed for each chemical INDEX WORDS Red imported fire ant Solenopsis invicta Glycine max biological control pesticide selectivity THE IMPACT OF THE RED IMPORTED FIRE ANT SOLENOPSIS INVICTA BUREN HYMENOPTERA FORMICIDAE ON SOYBEAN ARTHROPOD PESTS AND THEIR ASSOCIATED NATURAL ENEMIES IN GEORGIA by MICHAEL PAUL SEAGRAVES B S Centre College 2000 A Thesis Submitted to the Graduate Faculty of The University of Georgia in Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE ATHENS GEORGIA 2002 2002 Michael Paul Seagraves All Rights Reserved THE IMPACT OF THE RED IMPORTED FIRE ANT SOLENOPSIS INVICTA BUREN HYMENOPTERA FORMICIDAE ON SOYBEAN ARTHROPOD PESTS AND THEIR ASSOCIATED NATURAL ENEMIES IN GEORGIA by MICHAEL PAUL SEAGRAVES Approved Electronic Version Approved Gordhan L Patel Dean of the



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