Sequential Sampling for Panicle Caterpillars (Lepidoptera: Noctuidae) in Sorghum

Panicle caterpillars comprise an economically important insect pest complex of sorghum throughout the Great Plains of the United States, particularly in Kansas, Oklahoma, and Texas. The sorghum panicle caterpillar complex consists of larvae of two polyphagous lepidopteran species: the corn earworm,...

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Bibliographic Details
Published in:Journal of economic entomology 2014-04, Vol.107 (2), p.846-853
Main Authors: Elliott, N. C., Brewer, M. J., Giles, K. L., Backoulou, G. F., McCornack, B. P., Pendleton, B. B., Royer, T. A.
Format: Article
Language:English
Subjects:
Animal Distribution
Animals
Binomial distribution
Caterpillars
Control charts
corn earworm
Decision making
Economic importance
Economics
fall armyworm
Flowers - growth & development
Helicoverpa zea
Insect Control - methods
integrated pest management (IPM)
Kansas
Larva - growth & development
Larva - physiology
Larvae
Lepidoptera
Moths - growth & development
Moths - physiology
Noctuidae
Oklahoma
Population Density
Sampling
SAMPLING AND BIOSTATISTICS
Seasons
Sequential sampling
Sorghum
Sorghum - growth & development
Spodoptera frugiperda
Texas
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Summary:Panicle caterpillars comprise an economically important insect pest complex of sorghum throughout the Great Plains of the United States, particularly in Kansas, Oklahoma, and Texas. The sorghum panicle caterpillar complex consists of larvae of two polyphagous lepidopteran species: the corn earworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae). Sampling for panicle caterpillars in sorghum fields is usually accomplished by the beat bucket sampling technique with a fixed sample size of 30 beat bucket samples of one sorghum panicle each per 16.2 ha of field. We used Wald's sequential probability ratio test for a negative binomial distribution to develop a sequential sampling plan for panicle caterpillars. In total, 115 sorghum fields were sampled in Kansas, Oklahoma, and Texas from June to August 2010. Panicle caterpillars had an aggregated distribution of counts confirmed by Pearson's chi-square statistic for lack of fit to the negative binomial distribution for each sampled field. A sequential sampling plan was developed using a high threshold (an economic threshold) of 0.5 caterpillars per sorghum panicle, a low threshold (a safe level) of 0.20 caterpillars per panicle, and fixed error rates (α = 0.10 and β = 0.05). At caterpillar densities >0.45 and
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/EC13413