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United States Department of Agriculture

Agricultural Research Service

Research Project: CONTROL OF ARTHROPOD PESTS OF PECAN AND PEACH

Location: Fruit and Nut Research

Title: Movement of adult pecan weevils, Curculio carya within the pecan orchard

Authors
item Cottrell, Ted
item Wood, Bruce

Submitted to: Agricultural and Forest Entomology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 25, 2007
Publication Date: February 15, 2008
Citation: Cottrell, T.E., Wood, B.W. 2008. Movement of adult pecan weevils, Curculio carya within the pecan orchard. Agricultural and Forest Entomology. 10(4):363-373.

Interpretive Summary: The pecan weevil is an indigenous pest of pecan in North America. Movement by adults, emerging from the orchard floor, to the pecan tree and movement within and between trees is poorly understood. Knowing this information is key to the implementation of alternative management strategies that seek to exploit pecan weevil behavior. Additionally, no information exists on daily activity patterns for the pecan weevil movement. In this study, both male and female weevils were just as likely to be captured by any of four different trap styles used. More pecan weevils were found to crawl to the trunk than fly and a proportion of the population flies directly into the pecan canopy. In three of four years, adult pecan weevils were vertically distributed similarly throughout the pecan canopy and most pecan weevils captured in flight were from the highest traps suspended between trees. It was found that pecan weevils move from the orchard floor to the pecan tree near dusk.

Technical Abstract: The pecan weevil, Curculio caryae (Horn) (Coleoptera: Curculionidae), is an indigenous pest of pecan, Carya illinoensis Wang K. (Koch) in North America. Movement by adults, emerging from the orchard floor, to the pecan tree and movement within and between trees is poorly understood. Additionally, no information exists on diel periodicity of pecan weevil movement. In this study, no interaction of trap location gender was found for pecan weevils using any of four different trap styles. More pecan weevils were found to crawl to the trunk than fly and a proportion of the population flies directly into the pecan canopy. In three of four years, adult pecan weevils were vertically distributed similarly throughout the pecan canopy and most pecan weevils captured in flight were from the highest traps suspended between trees. In addition, this is the first report on the diel periodicity of movement of pecan weevils from the orchard floor to the trunk where it was found to be a predominantly crepuscular event taking place at dusk.

Last Modified: 10/1/2014