Location: Horticultural Crops Research
2010 Annual Report
Experiments were performed in a field-grown planting of Rhododendron. Attractants developed in the laboratory and tested in the field in previous growing seasons (2008-2009) have performed very well attracting 2.5-4.25× the BVW over the untreated controls. In previous years we have tested all of the commercially available insect traps with any promise for capturing BVW drawn to the attractants including the Exosect trap, Boll Weevil Trap, and Whalon modified Tedders Trap. Unfortunately, none of the commercially available traps were effective. We believe that the lack of capture in the commercially available traps was due primarily to a dichotomy between the trap design and weevil behavior in the field. In 2010 we designed and tested nine experimental traps in replicated field trials. Traps were individually placed in 1 m3 cages enclosing one Rhododendron. Twenty preovipositional BVW adults were released in each cage for 24 hrs and the number of weevils captured in the various trap designs determined. Over the course of the 2010 growing season, we were able to perform 20 replicates of each treatment.
Of the nine experimental traps tested, two designs were quite effective capturing nearly 50% of the BVW within a 24 hr period. The remaining designs were not as effective or consistent in capturing BVW. Over the course of our 2010 field trials we did observe biotic and abiotic factors that appeared to strongly influence both weevil behavior and capture rates. Understanding which of these factors are important and how they influence weevil behavior will be a key component to finalizing trap design that works well in various crop types, cropping systems and throughout the growing period when growers are monitoring for BVW activity.
Methods of ADODR monitoring included stakeholder meetings, phone calls, e-mail and site visits.