Location: Horticultural Crops Research
2011 Annual Report
To determine the most effective trap in combination with attractive semiochemicals for capturing O. sulcatus adults, replicated field studies were performed with a variety of experimental trap designs. We were able to identify a trap design that successfully captured a large proportion of the weevils in the field. This design will be refined to maximize capture rates.
To determine the efficacy of methyl salicylate (MeSA), an herbivore-induced plant volatile, for attracting natural enemies into fields, we completed 2nd year trials in Alberta spruce container yards and bare-root red maple fields. The inconsistent response of natural enemies to MeSA alerted growers to focus on other pest control options and researchers to focus on understanding the behavioral responses of natural enemies at a finer scale.
To clarify the role of raspberry aphids in vectoring viruses to raspberries, we monitored aphid feeding patterns on susceptible and resistant raspberry plants, their developmental times under a variety of temperatures and outdoors, and population trends in raspberry fields. These observations will enable growers to improve timing of treatments for aphids to reduce virus spread.
To determine the rhizosphere competence of the commercial isolate of M. anisopliae, inoculated cuttings were planted in fungal treated and control soils. Plants were then evaluated for rhizosphere colonization. To date, the rhizosphere of a wide variety of ornamentals are colonized with the insect killing fungus.
To determine the efficacy of a predatory mite to control black vine weevil, we completed laboratory assays confirming that Stratiolaelaps scimitus would feed on neonate weevil larvae. This potential biological control option is important to natural enemy suppliers and greenhouse growers.
To better understand the new invasive spotted wing drosophila, we conducted studies on the susceptibility of different ripeness stages of small fruits, cultivars and ornamental hosts, their spring time activity, and the efficacy of the predatory minute pirate bug. We have also placed traps in the field to develop monitoring strategies and treatment thresholds. These results have been used to develop revised management guidelines in 2011.
Walsh, D., Bolda, M., Goodhue, R., Dreves, A., Lee, J.C., Bruck, D.J., Walton, V.M., O'Neal, S.D., Zalom, F.G. 2011. Drosophila suzukii (Diptera: Drosophilidae): Invasive pest of ripening soft fruit expanding its geographic range and damage potential. Integrated Pest Management. 106(2):289-295. Lee, J.C., Bruck, D.J., Curry, H., Edwards, D.L., Haviland, D., Van Steenwyk, R., Yorgey, B. 2011. The susceptibility of small fruits and cherries to Spotted Wing Drosophila, Drosophila suzukii. Pest Management Science. DOI: 10.1002/ps.2225. Bruck, D.J., Bolda, M., Tanigoshi, L., Klick, J., Kleiber, J., De Francesco, J., Gerdeman, B., Spitler, H. 2011. Laboratory and field comparisons of insecticides to reduce infestation of Drosophila suzukii in berry crops. Pest Management Science. DOI: 10.1002/ps.2242.