Location: Horticultural Crops Research
Project Number: 5358-22000-037-07
Start Date: Oct 01, 2010
End Date: Feb 28, 2014
Laboratory studies will determine the stage(s) of ripeness the fruits that are most susceptible to SWD, this information will assist growers with the timing of treatments in the field. A common cultivar of each fruit (blueberry, raspberry, blackberry, strawberry, grape, cherry) will be tested at various stages of ripeness in no-choice and choice studies. Tests will compare methyl eugenol, GF 120, fermenting yeast, apple cider vinegar, and ~20 other semiochemicals available for flies. Preliminary screening will first be done by observing 25 male or 25 female flies in a four-arm olfactometer for orientation towards the odor released from one arm and air (control) from the other three arms. Bioassays will be performed using the formulated products of all small fruit and stone fruit insecticides registered in the states of Oregon, Washington, and California, with known or suspected activity against Diptera. While laboratory assays cannot determine which pesticides will perform well in the field, they can determine which pesticides lack activity against this pest. Assays will be performed to determine both the direct spray and residual activity of each product. The experiments will be performed in a randomized complete block design with three replicates each containing 10 20 adult SWD. All bioassays will be performed in disposable 100 x 15 mm Petri plates.