Sequential Sampling Plan for Scheduling Control of Lepidopteran Pests of Fresh Market Sweet Corn

Hoffmann, Michael P.; Nyrop, Jan P.; Kirkwyland, Jonathan J.; Riggs, D. M.; Gilrein, Daniel O.; Moyer, D. D.

doi:10.1093/jee/89.2.386

Cited by 21 publications

(12 citation statements)

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“… 2 Fields were over threshold when exceeding critical values for infestation as determined by sequential sampling (Hoffmann et al. 1996).…”

Section: Methodsmentioning

confidence: 99%

“…Analysis of variance was used to determine differences between T. ostriniae plots and insecticide sprayed plots for total eggs, neonatal larvae, larvae infesting stalks and ears, and ear damage. Fields were over threshold when exceeding critical values for infestation as determined by sequential sampling (Hoffmann et al 1996). 3 Organically managed field with spinosad applied to control O. nubilalis.…”

Section: Efficacy Of Trichogramma Ostriniae Compared With Insecticidamentioning

confidence: 99%

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Large‐scale releases of Trichogramma ostriniae to suppress Ostrinia nubilalis in commercially grown processing and fresh market sweet corn

Gardner

Hoffmann

Cheever

et al. 2007

J Applied Entomology

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We evaluated the egg parasitoid Trichogramma ostriniae (Pang et Chen) (Hym.: Trichogrammatidae) for control of European corn borer [Lep.:Crambidae: Ostrinia nubilalis (Hu¨bner)] in fields of commercial processing sweet corn in New York in 2002 and 2003.We made inoculative releases of 75 000 T. ostriniae/ha when corn was at midwhorl and regional O. nubilalis activity had begun. Each release field was paired with a similar non-release control. The incidence of egg mass parasitism, number of stalk tunnels, incidence of ear damage and effect on insecticide spray decisions were evaluated. Parasitism of cumulative number of O. nubilalis egg masses was 51.3 ± 7.2% and 43.5 ± 5.7% (mean ± SEM) in release fields in 2002 and 2003 respectively. The incidence of ear damage by O. nubilalis was not affected by T. ostriniae in either year of the study. There was no difference in stalk damage between release fields and control fields in either 2002 or 2003. However, individual comparisons between paired release and control fields showed reduced stalk tunnelling in 10 of 19 fields, but ear damage was reduced in only two of 19 fields. Neither the number of actual insecticide sprays nor the number of decisions to spray based on sequential sampling were affected significantly by releasing T. ostriniae. In a separate but related study, where releases were conducted in commercial fresh market sweet corn and used higher rates of release, T. ostriniae had no effect on the number of insecticidal sprays. In an additional experiment using small plots of sweet corn, ear damage was similar whether plots were treated with T. Ostriniae or with insecticide. Additional research should focus on improving the timing, frequency and rate of releases.

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“… 2 Fields were over threshold when exceeding critical values for infestation as determined by sequential sampling (Hoffmann et al. 1996).…”

Section: Methodsmentioning

confidence: 99%

Section: Efficacy Of Trichogramma Ostriniae Compared With Insecticidamentioning

confidence: 99%

Large‐scale releases of Trichogramma ostriniae to suppress Ostrinia nubilalis in commercially grown processing and fresh market sweet corn

Gardner

Hoffmann

Cheever

et al. 2007

J Applied Entomology

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“…Sampling stop lines, operational characteristic and average sample number functions were calculated using the computer program BETABIN developed by J. Nyrop (Hoffmann et al 1996). Stop lines were derived from the Wald sequential probability ratio test (Wald 1947) based on a binomial distribution because no test has been developed for the beta-binomial distribution.…”

Section: Methodsmentioning

confidence: 99%

“…Operational characteristic and average samrle number functions were generated for each 0 2 action thresholds (i.e., 10 and 30% damaged stems) following the sampling procedure described above using both binomial and beta-binomial random variates as sample observations (Hoffmann et al 1996). Beta-binomial random variates were determined using algorithms described by Press et al (1986).…”

Section: Methodsmentioning

confidence: 99%

Sequential Sampling Plans for Use in Timing Insecticide Applications for Control of European Corn Borer (Lepidoptera: Pyralidae) in Potato

Nault

Kennedy

1996

Journal of Economic Entomology

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Sequential sampling plans were developed for use in recommending control of European corn borer, Ostrinia nubilalis (Hiibner), in potato, Solanum tuberosum L., fields based on the distribution of damaged stems. Likelihood ratio tests indicated that the betabinomial distribution (aggregated) provided a better fit than the binomial (random) when the mean percentage of damaged stems in a field was~6'1'0, but not when damage was <6%. Similarly, variance-ratio (D) and eta) tests indicated that damage was aggregated generally at damage levels~6'1'0.Because the slope (b) :t SEM of the binary form of the Taylor power law (1.15 :t 0.05) (total of 41 fields) revealed moderate overdispersion, and a weak linear relationship existed between the index of aggregation (0) and p, sequential sampling plans were evaluated under various degrees of aggregation. The precision and practicality of the sequential sampling plans were evaluated through calculation of operational characteristic and average sample number functions for both simulated binomial and beta-binomial distributions. Precision of the sequential sampling plans decreased as the aggregation of O. nubilalis damage increased, especially when the proportion of damaged stems was near threshold. However, precision increased dramatically if fields near threshold were sampled more than once. Because, in practice, potato fields near threshold are sampled repeatedly, the sampling plans were considered acceptable. A comparison between the sequential sampling plan and the conventional sampling plan revealed that control decisions made using the sequential plan agreed closely with those made by the conventional plan, and averaged 57% fewer samples needed to make the decision.KEY WORDS presence-absence sampling, binomial and beta-binomial probability distributions, action thresholds, decision making

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“…The pest overwinters in southern Florida, where it infests sweet corn annually throughout the growing season (Janes 1973, Foster 1989. Further north, where it does not overwinter, it occurs later in the growing season (Hoffmann et al 1996).…”

mentioning

confidence: 99%

Enhanced Activity of the Nucleopolyhedrovirus of the Fall Armyworm (Lepidoptera: Noctuidae) on Bt-Transgenic and Nontransgenic Sweet Corn with a Fluorescent Brightener and a Feeding Stimulant

2005

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Sequential Sampling Plan for Scheduling Control of Lepidopteran Pests of Fresh Market Sweet Corn

Cited by 21 publications

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Large‐scale releases of Trichogramma ostriniae to suppress Ostrinia nubilalis in commercially grown processing and fresh market sweet corn

Large‐scale releases of Trichogramma ostriniae to suppress Ostrinia nubilalis in commercially grown processing and fresh market sweet corn

Sequential Sampling Plans for Use in Timing Insecticide Applications for Control of European Corn Borer (Lepidoptera: Pyralidae) in Potato

Enhanced Activity of the Nucleopolyhedrovirus of the Fall Armyworm (Lepidoptera: Noctuidae) on Bt-Transgenic and Nontransgenic Sweet Corn with a Fluorescent Brightener and a Feeding Stimulant

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