2009 Annual Report
1a.Objectives (from AD-416)
Attractant Development for Effective Adult Black Vine Weevil (BVW) Management.
1b.Approach (from AD-416)
The BVW is often cited as the number one insect pest in the major nursery production areas throughout the United States, particularly the Pacific Northwest, as well as in northern Europe. Traditional management of the BVW centers on the use of insecticide sprays targeted at adults during their preoviposition period in an attempt to avert egg laying. However, nurseries continually have problems timing spray applications. The advent of effective adult attractants would revolutionize current BVW management programs. Not only will spray timing be vastly improved, but new management tactics such as mass trapping and attract and kill strategies may prove possible. Documents SCA with Oregon State University.
Experiments were performed in a variety of crops infested with Otiorhynchus spp. (field-grown Taxus, apple rootstock, container-grown ornamentals and strawberry). Attractants developed in the laboratory were tested in the field using baited and control traps. Traps tested included the standard Exosect trap, Boll Weevil Trap, and Whalon modified Tedders Trap. Each attractant was replicated at each location four times with corresponding control traps. Pairs of baited and control traps making up each replicate were separated from one another by a minimum of 10m. Unique odors trialed at the same location were separated by a minimum of 20m. After the placement of traps in the field, odors were refreshed weekly and weevils collected and counted from each trap. In addition, we carefully searched all plants within 0.5m of each trap for BVW. The first BVW adults were collected in mid May, 2009. Trials were continued in the field thru July, 2009 at which time BVW numbers in the field were significantly reduced due to repeated insecticide applications applied by the growers.
The red line in all figures indicates a 1:1 proportion of weevil captures between the attractant and control treatments. In the strawberry field, attractants GLV12 and GLV15 performed very well attracting 2.5-4.25× the BVW as their corresponding control plots . Attractant GLV12 also performed well in the apple rootstock planting with 1.6× the number of BVW collected. Attractant GLV15 did not perform well in the apple rootstock while GLV10 and GLV16 attracted a significant number of weevils. In container-grown plants, attractants GLV15, GLV6 and GLV16 attracted 3, 5 and 5.5× the number of BVW, respectively. In field-grown Taxus, all compounds tested attracted a significant number of BVW. Because of plot size limitations, we were unable to test all attractants in all crops. Data from 2008 indicate that attractants GLV6 and GLV12 are the leading candidates for further study. Future work will focus on refining chemical blends and testing in additional crop types.
Methods of ADODR monitoring included meetings, site visits, phone calls and e-mail.