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Analysis Of The Effects Of Hypogeal And Epigeal Emergence On Seedling Competition In Legumes, Keith E. King

McCabe Thesis Collection

Seedling emergence is either hypogeal or epigeal. In hypogeal emergence the cotyledons remain below the soil surface during seedling development, while in epigeal emergence the cotyledons extend above the soil surface due to elongation of the hypocotyl. Here we examine the effect of seed size, and emergence type, on seedling growth. Six legumes with variation in seed size and either epigeal or hypogeal emergence were grown under dark and light conditions. A competition study was also conducted where a hypogeal and epigeal legume were grown in combination with wheat and ryegrass. Legumes expressing epigeal emergence were cowpea (Vigna unguiculata), mung …

Imported Longhorned Weevil (Coleoptera: Curculionidae) Injury To Soybean: Physiological Response And Injury Guild-Level Economic Injury Levels, Thomas E. Hunt, Leon G. Higley, Fikru J. Haile

Department of Entomology: Faculty Publications

The imported longhorned weevil, Calomycterus setarius Roelofs, is an occasional pest of soybean, Glycine max (L.), and can cause substantial defoliation of seedling soybean when the weevil is present in large numbers. Because weevil populations can reach high levels, the potential exists for significant seedling injury, so economic injury levels (EILs) are needed for imported longhorned weevil on seedling soybean. Because the bean leaf beetle, Cerotoma trifurcata (Forster), also is present on seedling soybean, injury by this insect should be included in EIL calculations. This study was conducted to (1) determine daily soybean consumption rates of imported longhorned weevil; (2) …

The Probabilistic Economic Injury Level: Incorporating Uncertainty Into Pest Management Decision-Making, Robert K. D. Peterson, Thomas E. Hunt

Department of Entomology: Faculty Publications

Despite the recognition that the economic injury level (EIL) is determined by dynamic biological and economic parameters, which can be highly variable and uncertain, there has been little effort to quantify uncertainty and to use estimates of uncertainty in the determination of EILs. In this paper, we define the probabilistic EIL (PEIL) and develop PEILs for two insect pest scenarios: alfalfa weevil larvae, Hypera postica (Gyllenhal), on early bud-stage alfalfa, and bean leaf beetle adults, Cerotoma trifurcata (Forster), on V1-stage soybean. The PEIL is an EIL that reflects its probability of occurrence. The probability of occurrence is determined by incorporating …

Ec03-883 Crop And Livestock Prices For Nebraska Producers, 1960-2003, Darrell R. Mark, Dillon Feuz, Roger Selley, Tina N. Barrett

University of Nebraska-Lincoln Extension: Historical Materials

This report contains historical price data for the major crops and livestock commodities produced in Nebraska. Prices received by producers are reported for 1960-2002 for most of the commodities.

The data was compiled from Nebraska Agricultural Statistics Services and Agricultural Prices, National Agricultural Statistics Service, USDA; Oil Crops Situation and Outlook, Economic Research Service, USDA; Cotton and Wool Outlook, Economic Research Service, USDA; and Livestock and Grain Market News, Agricultural Marketing Service, USDA. Sources of prices for each commodity are indicated on the tables.

Ec03-101 Nebraska Seed Guide, 2004, Lenis Alton Nelson, Robert N. Klein, Roger Wesley Elmore, David D. Baltensperger, Charles A. Shapiro, Stevan Z. Knezevic, James Krall

University of Nebraska-Lincoln Extension: Historical Materials

This circular is a progress report of corn hybrid performance tests conducted by the Agronomy/Horticulture Department and the Northeast, South Central, West Central and Panhandle Research and Extension Centers of Nebraska and University of Wyoming at Torrington. Conduct of experiments and publication of results is a joint effort of the Agricultural Research Division and the Cooperative Extension Service.

Ec03-1892 Identifying Soybean Rust

University of Nebraska-Lincoln Extension: Historical Materials

This four-color extension circular identifies the different diseases of soybeans: soybean rust, bacterial blight, bacterial pustle, and downy mildew. It also shows diseases that are similar looking: Cercospora blight, Frogeye leaf spot and brown spot. It also discusses what to look for when scouting for soybean rust.