Evaluation of a sequential egg mass sampling system for predicting second-generation damage by European corn borer (Lepidoptera: Pyralidae) in field corn in North Carolina
1995
Sorenson, C.E. | Van Duyn, J.W. | Kennedy, G.C. | Bradley, J.R. Jr | Eckel, C.S. | Fernandez, G.C.J.
A sequential egg mass sampling plan was developed for prediction of stalk tunneling damage by 2nd-generation European corn borer, Ostrinia nubilalis (Hubner), in field corn in eastern North Carolina. The plan was based on a critical density constructed from a linear relationship between egg mass numbers and subsequent stalk tunnel numbers; the sampling unit consisted of 5 leaves on 10 consecutive plants. Decision lines were constructed using the mean crowding-mean method developed by Iwao (1975). The plan was evaluated through computer simulations and comparison with field data. Average sample number and operating characteristic curves for a range of thresholds are estimated. The expected costs and feasibility of scouting for European corn borer under various economic conditions are examined.
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