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1 December 2000 Evaluation of Sequential Sampling Plans for the Larger Grain Borer (Coleoptera: Bostrichidae) and the Maize Weevil (Coleoptera: Curculionidae) and of Visual Grain Assessment in West Africa
W. G. Meikle, N. Holst, P. Degbey, R. Oussou
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Abstract

Repeated sampling of rural maize stores in Benin was conducted toevaluate published parameters of a sequential sampling plan for anegative binomial distribution to determine pest status forProstephanus truncatus (Horn) and Sitophiluszeamais Motschulsky. A computer program was used to rerandomizethe data and evaluate the effects, in terms of average sample numberand error rates, of different sampling plan parameter values. Withrespect to P. truncatus, lower and upper thresholds of 0.2and 1.0 insects per ear and parameter values of k = 0.2and α = β = 0.1 were found to be adequate. With respectto S. zeamais, lower and upper thresholds of 10 and 20insects per ear and parameter values of k = 1.0 andα = β = 0.1 were found to be adequate. Simplifiedsampling rules were proposed in which 11 ears should be sampled and ifno P. truncatus are found, the population is low; otherwisethe Wald plan should be followed. Owing to the lower per capita rate ofdamage, effective simplified sampling rules for S. zeamaiswere difficult to construct. An evaluation of the visual assessmentscale using whole ears showed that a visual scale estimating percentagedamage rather than percentage loss, might be easy to construct andpreferable for traders. Further work is needed to improve theusefulness of the visual scale in pest management decision support.

W. G. Meikle, N. Holst, P. Degbey, and R. Oussou "Evaluation of Sequential Sampling Plans for the Larger Grain Borer (Coleoptera: Bostrichidae) and the Maize Weevil (Coleoptera: Curculionidae) and of Visual Grain Assessment in West Africa," Journal of Economic Entomology 93(6), 1822-1831, (1 December 2000). https://doi.org/10.1603/0022-0493-93.6.1822
Received: 6 August 1999; Accepted: 1 August 2000; Published: 1 December 2000
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