Integrated Pest Management - Nebraska Extension Management... · 2018. 10. 24. · 10/24/2018 1 Integrated Pest Management University of Nebraska-Lincoln Extension Jenny Rees, Ron
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10/24/2018
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Integrated Pest ManagementUniversity of Nebraska-Lincoln Extension
Jenny Rees, Ron Seymour, Sarah Sivits, Wayne Ohnesorg, and Megan Taylor
IPM
• Broad basedapproach
• Integration ofpractices foreconomic control ofpests
This spreadsheet is designed to be used in the field on mobile devices, allowing the user to make management decisions immediately after scouting. Speed scouting is one method for determining whether soybean aphids have reached the treatment threshold of 250 aphids per plant. It relies on the
number of "infested" plants rather than estimating the number of aphids on each plant. Plants are considered "infested" if there are 40 or more aphids on the plant. After inputting your field information, the spreadsheet will suggest the next step: "Resample in 7-10 days," "Sample 5 more plants," or "Treat,
confirm in 3-4 days."
Wayne J. Ohnesorg, Extension Educator; Thomas E. Hunt, Extension Entomologist;
• 5-8% of plants with eggs or newly hatched larvae and
• Corn is at least 95% tasseled
• If an insecticide applications is needed it should be made before larvae reach ear tips
EC ####
Western Bean Cutworm Speed Scouting Spreadsheets
Silvana Paula-Moraes, Embrapa/UNL; Wayne J. Ohnesorg, UNL Extension Educator; Eric Burkness,
Department of Entomology, University of Minnesota; Gary Hein, UNL Entomologist; Thomas E. Hunt,
UNL Extension Entomologist; Robert J. Wright, UNL Extension Entomologist; and William Hutchison, Department of Entomology, University of Minnesota.
These spreadsheets are designed to be used in field corn or sweet corn to monitor populations of Western Bean Cutworm (WBC) on smartphones or tablets, allowing the user to make management decisions immediately after scouting. Speed scouting is a new method for determining whether WBC populations have reached the action threshold for treatment with an insecticide. It depends on the presence or absence of egg masses on plants rather than keeping a running total. Presence is when there is at least 1 egg mass on a plant. By using this method, a scouting effort can potentially be reduced to ~50 plants on average, but the
maximum will not exceed 100 plants. After inputting the egg mass observations, the spreadsheet will recommend one of three options: 1) "Resample in 2-3 days," 2) "Sample 10 more plants," or 3) "Treat." The 3 different action threshold levels should be used as follows:4% - Use the 4% threshold for sweet corn or field corn when prices are at or above $3.50/bushel8% - Use the 8% threshold for field corn when prices are below $3.50/bushel20% - Use the 20% threshold for field corn when corn is at mid-silk stage (R3)
• 10.23% of respondents said they usually use insecticides that are non-toxic to predators
• 31.82% said they would use non-toxic insecticides if they knew which ones were non-toxic to predators
Conservation Biological Control
Insecticides with Lower Risk to Natural Enemies
• Class 28: Diamides (Prevathon, Coragen)
• Class 22A: Indoxacarb (Steward)- label soon?
• When can there be an economic return on a higher cost/ac product? Will pest and plant phenology match up? Are natural enemies present in the field? How far into the WBC flight? Potential for natural enemies to help “clean up” egg
masses laid after the insecticide application in the field