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Degree-Day Requirements For Alfalfa Weevil (Coleoptera: Curculionidae) Development In Eastern Nebraska, A. R. Stilwell, Robert J. Wright, Thomas E. Hunt, Erin E. Blankenship
Degree-Day Requirements For Alfalfa Weevil (Coleoptera: Curculionidae) Development In Eastern Nebraska, A. R. Stilwell, Robert J. Wright, Thomas E. Hunt, Erin E. Blankenship
Department of Entomology: Faculty Publications
The alfalfa weevil, Hypera postica (Gyllenhal), is a serious, yet sporadic defoliator of alfalfa, Medicago sativa L., in Nebraska. A 2-yr study was conducted in 2005 and 2006 to test for variation in degree-day requirements by location in eastern Nebraska. Sampling took place along a latitudinal gradient in three regions of eastern Nebraska. Three fields were sampled in each region during the 2 yr of the study. Alfalfa weevil larval degree-day requirements were found to vary by latitude in eastern Nebraska. Alfalfa weevil larvae were discovered in southern regions after fewer developmental degree-days had accumulated than in fields in the …
Degree-Day Requirements For Eight Economically Important Grasshoppers (Orthoptera: Acrididae) In Nebraska Using Field Data, Mathew L. Brust, William Wyatt Hoback, Robert J. Wright
Degree-Day Requirements For Eight Economically Important Grasshoppers (Orthoptera: Acrididae) In Nebraska Using Field Data, Mathew L. Brust, William Wyatt Hoback, Robert J. Wright
Department of Entomology: Faculty Publications
The timing of application for the management of rangeland grasshoppers (Orthoptera: Acrididae) is critical, especially as insecticides become more specialized and the use of Insect Growth Regulators becomes more widespread. The general seasonal occurrence of adults of many grasshopper species has been well documented; however, their appearance varies widely between years. We analyzed sweep samples collected over the western two thirds of Nebraska from a 3-yr period and noted the occurrence of adults by region for eight species of rangeland grasshoppers. We analyzed occurrence based on degree-day accumulations for the region and developed estimates of degree-day requirements for these species. …