COMPOSED ERROR MODEL FOR INSECT DAMAGE FUNCTIONS: YIELD IMPCT OF ROTATION RESISTANT WESTERN CORN ROOTWORM IN ILLINOIS
| dc.creator | Mitchell, Paul D. | |
| dc.creator | Gray, Michael E. | |
| dc.creator | Steffey, Kevin L. | |
| dc.date | 2017-04-01T13:46:35Z | |
| dc.date.accessioned | 2026-07-09T03:45:39Z | |
| dc.description | This paper describes a composed error model for estimating the conditional distribution of yield loss to serve as an insect damage function. The two-part error separates yield variability due to pest damage from other non-pest factors such as soil heterogeneity, non-uniform application of agronomic practices, and measurement errors. Various common functional forms (linear, quadratic, Cobb-Douglas, negative exponential, hyperbolic, sigmoid) for the pest damage function are presented and parameter estimation is described. As an empirical illustration, the model is used to estimate a damage function for corn rootworm, the most damaging insect pest of corn in the United States. The estimated damage function gives expected proportional yield loss as a function of the root rating difference and is used to estimate yield loss due to rotation resistant western corn rootworm in east-central Illinois. The estimated average yield loss is 11.6%, more than enough to cover the cost of a soil insecticide application. However, tremendous variability in actual loss exists, so that the probability that actual loss is less than the cost of a soil insecticide ranges 32-45%, depending on the assumed yield and price. As a result, IPM methods potentially have great value, since they can eliminate uneconomical soil insecticide applications. | |
| dc.identifier | doi:10.22004/ag.econ.24020 | |
| dc.identifier | https://ageconsearch.umn.edu/record/24020/files/fp02-02.pdf | |
| dc.identifier | http://ageconsearch.umn.edu/record/24020 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/539442 | |
| dc.language | eng | |
| dc.publisher | ||
| dc.source | http://ageconsearch.umn.edu/record/24020 | |
| dc.title | COMPOSED ERROR MODEL FOR INSECT DAMAGE FUNCTIONS: YIELD IMPCT OF ROTATION RESISTANT WESTERN CORN ROOTWORM IN ILLINOIS | |
| dc.type | Text |