Estimating the Relative Abundance of Adult Citrus Root Weevils (Coleoptera: Curculionidae) with Modified Tedders Traps
| Autor: | James H. Graham, Philip A. Stansly, R. F. Mizell, Larry W. Duncan, Clayton W. McCoy |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Environmental Entomology. 30:939-946 |
| ISSN: | 1938-2936 0046-225X |
| DOI: | 10.1603/0046-225x-30.5.939 |
| Popis: | Taylor’s power law (s2 = a x b) was fitted to the means and variances of numbers of adult Diaprepes abbreviatus L. and Pachnaeus litus (Germar) caught monthly in modified Tedders traps (citrus Tedders traps). Data for D. abbreviatus were obtained in six Florida citrus groves, two located on the central ridge and the others in the central and southern flatwoods. Parameters for P. litus (a = 2.15, b = 1.17) using data pooled from two sites were consistent with parameters derived from the individual sites. Parameters derived from pooled data for D. abbreviatus were a = 2.69, b = 1.33; however, there was significant variability of the parameter b among sites. For specified levels of precision (confidence interval half-length:mean ratio), from 0–30% fewer traps were needed to estimate numbers of P. litus compared with D. abbreviatus at densities encountered in these groves. Plot size from 0.06 to >12 ha affected the numbers of traps needed to obtain monthly mean estimates of adult weevils per trap wi... |
| Databáze: | OpenAIRE |
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