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Ian V MacRae
Researcher at University of Minnesota
Publications - 51
Citations - 1181
Ian V MacRae is an academic researcher from University of Minnesota. The author has contributed to research in topics: Soybean aphid & Phytoseiidae. The author has an hindex of 14, co-authored 49 publications receiving 1064 citations. Previous affiliations of Ian V MacRae include Oregon State University & Colorado State University.
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Economic threshold for soybean aphid (Hemiptera: Aphididae)
David W. Ragsdale,Brian P. McCornack,Robert C. Venette,Bruce D Potter,Ian V MacRae,Erin W. Hodgson,Matthew E. O'Neal,K. D. Johnson,R. J. O'Neil,Christina D. DiFonzo,T. E. Hunt,Phillip A. Glogoza,Eileen M. Cullen +12 more
TL;DR: The ET developed here is strongly supported through soybean growth stage R5, which provides a 7-d lead time before aphid populations are expected to exceed the economic injury level (EIL) and exposes a larger portion of the soybean aphid population to selection by insecticides, which could lead to development of insecticide resistance.
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Biological Control of Apple Mites by Mixed Populations of Metaseiulus occidentalis (Nesbitt) and Typhlodromus pyri Scheuten (Acari: Phytoseiidae)
Brian A. Croft,Ian V MacRae +1 more
TL;DR: Mixtures of Metaseiulus occidentalis and Typhlodromus pyri Scheuten inoculated into apple trees gave as good or better biological control of European red mite Panonychus ulmi Koch and twospotted spider mite Tetranychus urticae than did similarly sized populations of either predatory mite alone.
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Evidence for Soybean Aphid (Hemiptera: Aphididae) Resistance to Pyrethroid Insecticides in the Upper Midwestern United States.
Anthony A. Hanson,James Menger-Anderson,Celia Silverstein,Bruce D Potter,Ian V MacRae,Erin W. Hodgson,Robert L. Koch +6 more
TL;DR: The resistance documented in this study indicates that there has been repeated selection pressure for pyrethroid resistance in some soybean aphid populations, and integrated pest management and insecticide resistance management should be practiced to slow further development of soy bean aphid resistance to pyrethroids.
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Persistence of Typhlodromus pyri and Metaseiulus occidentalis (Acari: Phytoseiidae) on apple after inoculative release and competition with Zetzellia mali (Acari: Stigmaeidae).
Brian A. Croft,Ian V MacRae +1 more
TL;DR: In 1990, Metaseiulus occidentalis was the dominant phytoseiid in mixed-species release plots in 1990, but T. pyri was more common in 1991 as mentioned in this paper.
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Low-level jet streams associated with spring aphid migration and current season spread of potato viruses in the U.S. northern Great Plains
TL;DR: The objective of this research was to relate spring low-level jet streams to intensity of M. persicae flight activity and current season spread of PLRVand PVY in seed potato.