A simulation study was conducted on 17 different sampling patterns for parsley fields infested with carrot weevil, Listronotus oregonensis (LeConte), oviposition scars to determine the best sampling transect for decision making. The action threshold used was 1% plants infested with oviposition scars. A sample of 148 parsley plants having no oviposition scars indicated that treatment was not necessary; any infested plants found before 148 plants were sampled indicated treatement. Sampling a commercial parsley field in an X-shaped pattern in any direction was found to be the best transect for sampling carrot weevil oviposition scars in parsley fields. This transect results in the most correct decisions and the fewest incorrect decisions overall. It has one of the highest average sample sizes when the infestation is below the action threshold, and one of the smallest when the infestation is above. The decision rules developed in this study can assist parsley growers with better timing for pesticide applications or biological controls.
Species 1: Coleoptera Curculionidae Listronotus oregonensis (carrot weevil)
Keywords: Decision Rules, Integrated Pest Management
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA