New Biological Control Agents Of Soybean aphid (Aphis glycines) Using Native and Previously Introduced Hymenopterous Parasitoids and Dipteran Predators
Kaiser, Matthew E.
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Soybean aphid (Aphis glycines, Hemiptera: Aphididae) is an invasive species that originates from China and was first sighted in the United States in July of 2000 (DiFonzo 2002). Severe damage to soybean plants (Glycine max) was soon documented. Previous to this invasion there were few aphids feeding on soybean. While other infested states are introducing exotic natural enemies in a biological control effort, none have been released in Michigan. This study sets out to explore the possibility that native and previously introduced natural enemies of aphids already established in the area may be able to adapt to the invasive soybean aphid. Our objective is to detect the presence of resident parasitoids and predatory flies that have adapted to utilize soybean aphid. We focus primarily on parasitic wasps and predatory flies. Soybean aphid natural enemies were sampled twice, once in June and once in August. 80 pots of soybean infested with SBA were placed in different treatments in a field setting at KBS LTER main experimental site in 20 sets of four. These pots were exposed to parasitoids and predatory flies of the soybean aphid for a 3 day period. The parasitoids oviposited in aphids and the flies oviposited on aphid-infested soybean foliage of the pots. The soybean plants were then clipped and placed in emergence canisters to trap emerging adult parasitoids and predatory flies. We have detected a diverse assemblage of native or previously introduced natural enemies attacking soybean aphid. Possibilities for their use in the biological control of the invasive soybean aphid are discussed.