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

Li, Hong; Syvertsen, James P.; Stuart, Robin J.; McCoy, C. W.; Schumann, Arnold W.; Castle, William S.

doi:10.1097/01.ss.0000142637.54611.7d

Cited by 13 publications

(9 citation statements)

References 15 publications

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“…2), which was in line with the results reported in several studies10, 19–21 Rainfall had direct effects on insect life cycles by influencing nutritional quality in plant tissues, and rainfall was one of the predictive indices of spring outbreaks of insects 22. With the abundant rain (1752 mm year −1 ) in the citrus production areas of Florida, flooding and soil water saturation have contributed to citrus tree water stress and root injury 4, 6…”

Section: Discussionsupporting

confidence: 81%

“…The primary tool for managing Diaprepes is application of insecticides 4, 6. The present results would also indicate that the more abundant weevil population that occurred during the high rainfall period (Fig.…”

Section: Discussionsupporting

confidence: 56%

“…The positive correlations between Diaprepes weevils, AT, ST and rainfall variables over a period of 30 months (Table 2) suggested that the weevil population would increase with increasing air/soil temperatures and rainfall. These multiyear positive correlations also suggested that the weevil density at the grove would be influenced not only by characteristics of the soils in which their host trees were growing4, 6 but also by temporal patterns of ambient temperature and rainfall. In this citrus grove, the Diaprepes weevil density was correlated with sand content, soil pH and Mg and Ca concentrations at P < 0.0282 6.…”

Section: Discussionmentioning

confidence: 91%

“…Soil waterlogging and Diaprepes root weevil infestations can occur simultaneously in citrus groves,4 and studies conducted in Florida citrus ecosystems have found that soil waterlogging could damage citrus tree roots and reduce Diaprepes larval survival because of soil compaction and lack of gas exchange 5 . Diaprepes adult weevils moved only 0–72 m in a period of over 10 weeks in the summer in citrus groves,1 and their abundance in citrus groves was likely related to seasonal weather2 and associated with certain physical and chemical soil characteristics 4, 6. It was also reported that ambient temperature influenced Diaprepes larval growth, pupation and emergence 7…”

Section: Introductionmentioning

confidence: 99%

“…Air temperature and rainfall are among the most important environmental factors in citrus production systems, as shown by the influence of temperature and solar radiation in the apple orchard system 12. Also, soil moisture and insect population are among the most dynamic variables in horticultural production systems 4, 6. Since most life stages of the Diaprepes root weevil, including larvae and pupae, occur in soil,2–3 it would be useful to quantify the temporal correlations of a multiyear Diaprepes population with these environmental variables.…”

Section: Introductionmentioning

confidence: 99%

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Cross‐correlation patterns of air and soil temperatures, rainfall and Diaprepes abbreviatus root weevil in citrus

Futch

Syvertsen

2007

Pest Management Science

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Time series cross-correlation analysis is appropriate when measuring relationships between two different time series. Using this approach, the authors quantified the relationship between the time series air temperature (AT), soil temperature (ST), rainfall, relative humidity (RH) and Diaprepes abbreviatus (L.) (Coleoptera: Curculionidae) root weevil across a period of 30 months, and examined how closely the distribution of Diaprepes root weevil was related to AT, ST, rainfall and RH within this period of time. The study was conducted on a poorly drained Spodosol in a citrus [Citrus sinensis (L.) Osb.] grove in DeSoto County, south-west Florida, from April 2001 to September 2003. Adult weevil populations were monitored using 100 Tedders traps in a 30 x 15 m grid. Weather data (0.6 m AT, 0.1 m ST, 2 m rainfall and 2 m RH) were monitored by Florida Automated Weather Networks. The monthly mean and standard deviation were 22.3 +/- 4.0 degrees C for AT, 24.7 +/- 4.2 degrees C for ST, 146.0 +/- 122.7 mm for rainfall, 78.2 +/- 4.7% for RH and 0.74 +/- 0.59 adults trap(-1) for the root weevil. Weevil density was positively correlated with AT (r = 0.45, P < 0.0133), ST (r = 0.49, P < 0.0067) and rainfall (r = 0.38, P < 0.0450). The environmental variables AT, ST, rainfall and RH were correlated with each other (0.42 < r < 0.99, 0.0246 < P < 0.0001). All weather and Diaprepes variables were autocorrelated with each other within a time of 3 months. The cross-correlation coefficients varied between - 0.59 and 0.65 for the pair-variable between Diaprepes, AT, ST and rainfall, and these pair-variables were correlated across a time period of 4 months. The present results suggested that warm, wet conditions contributed to the root weevil outbreaks, and environmental temperature and rainfall were the variables most closely related to Diaprepes root weevil distribution in time.

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