Sequential Sampling Plan for Integrated Pest Management of Pecan Nut Casebearer (Lepidoptera: Pyralidae)

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Sequential sampling plans allow integrated pest management (IPM) decisions to be made quickly and precisely, and degree-day prediction models identify the rate of development of populations. Combining these IPM tools allows the user to sample a population at a particular point in its development and extrapolate the result into the future to determine whether or not management action is warranted. A degree-day prediction model developed earlier for the first summer generation of pecan nut casebearer, Acrobasis nuxvorella Neunzig, was coupled with a sequential sampling plan developed in this study and tested in 25 field trials. Samples were taken in each trial when the degree-day model predicted that oviposition was 10% complete. Sampling results were extrapolated to determine if the subsequent population would damage 10% or more of a harvestable pecan crop. If not, no management action was taken; if so, management was conducted while leaving an untreated check. Sixteen decisions not to take action and nine to take action were made in the trials. Subsequent damage did not exceed 10% infestation of the nut clusters in the no-action decision group and did exceed that level in eight of the nine action decision groups. The one error occurred in a take-action trial where the infestation in the check averaged 9.5%.This novel application of IPM technology achieved by combining two standard techniques is superior to but no more difficult than present strategies for control of this key pest of pecans.

Document Type: Research Article

Publication date: June 1, 1989

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