Estimating the Relative Abundance of Adult Citrus Root Weevils (Coleoptera: Curculionidae) with Modified Tedders Traps

Duncan, Larry W.; McCoy, C. W.; Stansly, Philip A.; Graham, James H.; Mizell, Russell F.

doi:10.1603/0046-225x-30.5.939

Cited by 30 publications

(13 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Estimates of the parameter b from TaylorÕs Power Law were very similar (range, 1.30 Ð1.33) for cases in which number of funnels/tree ranged from one to eight, whereas the parameter a varied inversely with funnel numbers (Table 2). Estimates of the parameter b are congruent with that estimated for adult D. abbreviatus (1.33) collected using modiÞed Tedders traps (Duncan et al 2001).…”

Section: Resultssupporting

confidence: 66%

“…Data from the 25-tree experiment were Þtted to TaylorÕs Power Law (TPL; s 2 ϭ a(x ) b ) to estimate the relationship between the variance (s 2 ) and mean (x) across different intervals of time (Taylor 1961, Duncan et al 2001. The means and variances for numbers of larvae/funnel/tree/wk and numbers of larvae/funnel/tree/mo were determined for cases in which eight, four, two, or one funnels were used per tree.…”

Section: Methodsmentioning

confidence: 99%

“…Log n variance was regressed on log n mean to derive parameter estimates of TaylorÕs Power Law. The number of trees and number of funnels/tree needed to estimate the mean population density with a conÞdence interval half-length equal to 50% of the mean (P ϭ 0.05) was estimated from the formula n ϭ ͑z ␣/2 2 ax bϪ2 ͒/(0.5CI/x) 2 where n ϭ sample size, z ϭ the standard normal variate (1.96, P ϭ 0.05), a and b are TPL parameters, and CI ϭ conÞdence interval (Duncan et al 2001). These data were used to design the third experiment.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Abundance of Diaprepes abbreviatus (L.) (Coleoptera: Curculionidae) Neonates Falling to the Soil Under Tree Canopies in Florida Citrus Groves

Nigg¹,

Simpson²,

Stuart³

et al. 2003

Self Cite

View full text Add to dashboard Cite

The purpose of these experiments was to estimate the number and distribution of Diaprepes abbreviatus (L.) neonate larvae dropping from the canopy of infested citrus trees. The number of neonates was monitored in the field using passive funnel traps in two simultaneous experiments and a separate experiment for an additional year. In one experiment, traps were placed from trunk to dripline in the cardinal directions under each of five trees (132 traps total). In a second experiment, eight traps were placed under each tree in the cardinal directions, one trap 30 cm from the trunk and one trap 30 cm from the dripline/direction for 25 trees (200 traps total). Larvae were collected weekly for 50 wk in conical tubes containing ethylene glycol as a preservative. Traps closer to the tree trunk captured more larvae than traps nearer the dripline. The area under the tree canopy was positively correlated with the total estimated number of larvae captured per tree. The estimated number of total larvae/tree over the course of our experiments ranged from 955 to 7,290. The highest number of neonate larvae observed in 1 wk was 67 +/- 6/m2. There was an inverse relationship between the number of traps beneath a tree and the number of trees that needed to be sampled to estimate mean population density with a given precision. However, there was a direct relationship between number of traps/tree and the total number of traps needed for a given precision. This passive technique could be used to quantify the destructive larval stage and to assess D. abbreviatus management strategies.

show abstract

Section: Resultssupporting

confidence: 66%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Abundance of Diaprepes abbreviatus (L.) (Coleoptera: Curculionidae) Neonates Falling to the Soil Under Tree Canopies in Florida Citrus Groves

Nigg¹,

Simpson²,

Stuart³

et al. 2003

Self Cite

View full text Add to dashboard Cite

show abstract

“…Diaprepes adults were monitored weekly using modified pyramidal Tedders traps as described in Tedders and Wood (1994), Duncan et al (2001), andMcCoy et al (2003). The Diaprepes adult population was monitored using 50 Tedders traps, placed near tree trunks 25 m apart in five 10-trap transects in a 34 ϫ 25-m grid pattern along five mature tree beds (Fig.…”

Section: Tree and Adult Weevil Assessmentsmentioning

confidence: 99%

Soil and Diaprepes Abbreviatus Root Weevil Spatial Variability in a Poorly Drained Citrus Grove

Li¹,

Syvertsen²,

Stuart³

et al. 2004

Soil Science

View full text Add to dashboard Cite

“…Various methods have been evaluated as surveillance tools for adult D. abbreviatus populations, although none appear to be effective (Beavers et al 1979(Beavers et al , 1982Jones 1983, 1984;Jones and Schroeder 1984;Schroeder and Beavers 1985). Adult D. abbreviatus can be collected using traps such as cone-type emergence traps (Duncan et al 2001), Tedders pyramid trap (Tedders and Wood 1994, Stansly et al 1997, Duncan et al 2001, and the Schroeder-Jones cup trap . The Tedders trap is currently the trap recommended for monitoring for the presence of adult D. abbreviatus in citrus groves (Nigg et al 2001).…”

mentioning

confidence: 99%

Sampling Methods as Abundance Indices for Adult Diaprepes abbreviatus (Coleoptera: Curculionidae) in Citrus

Nigg¹,

Simpson²,

Hall³

et al. 2002

View full text Add to dashboard Cite

Beat sampling and two type of traps, cup traps and Tedders traps, were evaluated as sampling methods to detect and estimate population densities of adult Diaprepes abbreviatus L. weevils newly colonizing young citrus trees. The study was conducted over a 65-wk period across a 0.25-ha area of 80 citrus trees [Citrus sinensis (L.) Osbeck] (1.2-1.5 m tall). Beat samples were taken weekly to determine the number of trees infested and number of new adult weevils per tree. Sixteen of the 80 trees studied were each monitored weekly using one of the following trapping methods: cup traps in trees, cup traps on a stake in the ground within the tree drip line, cup traps on a stake in the ground outside of the drip line, Tedders traps on the ground within the drip line, and Tedders traps on the ground outside of the drip line. Weevils collected each week from trees and traps were removed from the study site. Based on the coefficients associated with Taylor's power law, the optimum numbers of trees to sample for an SEM equal to 25% of the mean estimate decreased from 50 trees at a mean of 0.5 new weevils per tree to 30 trees at a mean of 0.8 new weevils per tree. A significant relationship was found between the weekly mean number of new weevils per tree and the proportion of trees infested, a binomial relationship that could be further explored in the search for a sampling program for adult D. abbreviatus. Regression analyses indicated that three of the trapping methods served at least as weak indices of the presence and abundance of new weevils: cup traps in trees, Tedders traps inside the dripline and Tedders traps outside the dripline. Cup traps in trees and Tedders traps inside the dripline captured the most weevils and most frequently detected weevils. Although relatively inefficient as abundance indices of populations of new weevils, these two trapping methods appeared to have some value with respect to signaling when weevils first appeared in trees during the spring.

show abstract

Estimating the Relative Abundance of Adult Citrus Root Weevils (Coleoptera: Curculionidae) with Modified Tedders Traps

Cited by 30 publications

References 11 publications

Abundance of <I>Diaprepes abbreviatus</I> (L.) (Coleoptera: Curculionidae) Neonates Falling to the Soil Under Tree Canopies in Florida Citrus Groves

Abundance of <I>Diaprepes abbreviatus</I> (L.) (Coleoptera: Curculionidae) Neonates Falling to the Soil Under Tree Canopies in Florida Citrus Groves

Soil and Diaprepes Abbreviatus Root Weevil Spatial Variability in a Poorly Drained Citrus Grove

Sampling Methods as Abundance Indices for Adult <I>Diaprepes abbreviatus</I> (Coleoptera: Curculionidae) in Citrus

Contact Info

Product

Resources

About