The soybean aphid, Aphis glycines, is a major economic pest of Midwest soybean.
Since its discovery in the United States in 2000, significant strides have been made in
developing an integrated pest management (IPM) program for this pest. The primary
method of controlling soybean aphid outbreaks is through the use of foliar insecticides,
but alternative management strategies such as host plant resistance varieties, reduced-risk
insecticides and neonicotinoid seed treatments are also available. In addition, natural
control from soybean aphid natural enemies can contribute towards aphid suppression.
Conserving these natural enemies is an important component of soybean aphid IPM. The
focus of this dissertation is to better understand the interactions between the management
strategies currently available for soybean aphid management and whether the strategies
are 1) effective at managing soybean aphid populations and 2) can successfully be
utilized in combination with natural enemies to improve on soybean aphid IPM. To
investigate these questions, both laboratory and field studies were conducted over three
field seasons. Field studies demonstrated varying impacts of reduced-risk insecticides on
the soybean aphid and its natural enemies. Minimal effects on soybean aphid and their
natural enemies were demonstrated from the use of aphid resistant soybean and seedtreated
soybean. Laboratory studies showed minimal non-target risks to natural enemies
from exposure to seed treatments and host plant resistance. A field study to enhance
aphid biological control with a buckwheat intercrop demonstrated minimal effects on
either aphid or natural enemy populations. In summary, alternative soybean aphid
management strategies exist that successfully suppress aphid population while also
minimizing risks to natural enemies. Results of this research will help improve the
integration of management strategies in soybean aphid IPM.
University of Minnesota Ph.D. dissertation. December 2012. Major: Entomology. Advisors:Dr. David Ragsdale and Dr. George Heimpel. 1 computer file (PDF); ix, 143 pages
Heidel-Baker, Thelma Tolentino.
Compatibility of soybean aphid integrated pest management strategies.
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