Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"Economic Threshold"”.
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Predator-prey interactions involving the soybean aphid (Hemiptera: Aphididae) in Missouri
… aphid's widespread distribution, it has reached economic threshold in few soybean fields in Missouri. We hypothesized that a predator complex suppresses soybean aphid populations in Missouri prior to reaching economic threshold and that this complex can easily be disturbed by insecticide …
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Management of the soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in Iowa
… of this research was to verify the preliminary economic threshold for A. glycines management in Iowa. Secondary goals included; verifying an alternative sampling techniques for estimating A. glycines populations, evaluating the effect of planting date on A. glycines population growth, and …
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Optimal Management of a Common Property Pest Under Risk: An Application to the Corn Rootworm
… and risk aversion are incorporated into an economic threshold model. Two control actions, soil insecticide and crop rotation, are included. The effect of crop insurance and improved scouting accuracy on insecticide use is evaluated. The rootworm population is considered to be a common …
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The Spatial Trends of Japanese Beetles in Illinois Soybean Fields and Their Effects on Sampling and Production
… in both years was well below the widely accepted economic threshold of 15 to 20% defoliation between bloom and pod fill. Densities of Japanese beetles were larger in field edges than in field interiors in both 2009 and 2010, but the difference in densities between field edges and field interiors …
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Non-traditional sources of critical minerals from the Western Canada Sedimentary Basin
… WCSB basinal brines. While REE do not occur in economic abundances, Li concentrations across the basin can regularly exceed the economic threshold (~75 mg/L). However, the source of Li is poorly understood. Based on an increasing body of evidence, in-situ water-rock interactions are proposed to …
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Evaluation of Rice Stink Bug, Oebalus pugnax (F.), Damage and Monitoring Techniques in Rice, Oryza sativa L., and Grain Sorghum, Sorghum bicolor (L.)
… of the current Arkansas indirect yield loss threshold of 10 rice stink bugs during the second two weeks of heading. </p> <p>In 2016-2018, insecticide termination timing for rice stink bug in rice was determined based on visual evaluation of percent rice grain maturity (hard dough). Data …