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Sequential sampling protocols for Spodoptera frugiperda (Lepidoptera: Noctuidae), on Zea mays fields: influence of sampling unit size

Published online by Cambridge University Press:  09 March 2007

G.V. Serra  and
E.V. Trumper
G.V. Serra
Affiliation:
Cátedra de Zoología Agrícola, Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, Av. Valparaíso s/n, 5000 Córdoba, Argentina
E.V. Trumper*
Affiliation:
Sección Entomología, Instituto Nacional de Tecnología Agropecuaria – Estación Experimental Agropecuaria Manfredi, Ruta Nacional 9, Km 636, 5988 Manfredi, Argentina
*
*Fax: 54 3572 493061 E-mail: entomomanfre@correo.inta.gov.ar
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Abstract

Spodoptera frugiperda (J.E. Smith) is a major pest in maize fields in Argentina. However, a sampling method that accounts for spatial pattern and allows reliable pest density estimations is still lacking. This paper addresses the issue of how sampling unit size can influence the characterization of S. frugiperda spatial pattern and the performance of sampling plans. An intensive sampling programme for S. frugiperda larvae was carried out in maize fields from October until March in four growing seasons. On each sampling date, 12 to 20 sampling units were taken at random. Each unit consisted of 1, 2, 4, 6, 8, 10 or 12 consecutive plants along a row. The linearized version of the Taylor's power law (TPL) was fitted to mean and variance estimated for each sampling date and data set through least squares regression. In general, b values from TPL were significantly >1 (P<0.05), indicating an aggregated sampling distribution. Regression slopes (b) ranged from 1.28 to 1.48 in small larvae and from 1.06 to 1.24 in large larvae, indicating stronger clumping in the former. TPL parameters were used to develop constant precision sampling plans. The efficiency of these plans in terms of expected total cost (searching and handling sampling units) was very sensitive to the size of the sampling units with small larvae but not with large larvae. The influence of sampling unit size and spatial pattern on TPL parameters and sampling costs is discussed.

Keywords

sequential estimationsampling effortTaylor's power lawspatial patternGreen's model
Type
Research Article
Information
Bulletin of Entomological Research , Volume 96 , Issue 5 , October 2006 , pp. 471 - 477
Copyright
Copyright © Cambridge University Press 2006

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