There is a whole series of updated info (Published December 2019) from Oregon State University
About this series
This publication is one of a series of nine publications focused on strategies for controlling spotted-wing drosophila in Oregon. Find them at https://catalog.extension.oregonstate.edu/. The publications in this series include:
- EM 9261: How Seasons Affect Population Structure, Behavior and Risk on Spotted-wing Drosophila
- EM 9262: Cultural Control Strategies to Manage Spotted-wing Drosophila
- EM 9263: Host Range and Characteristics Affecting Fruit Susceptibility to Spotted-wing Drosophila
- EM 9264 Noncrop Host Plants Used By Spotted-wing Drosophila
- EM 9265: Chemical Control of Spotted-wing Drosophila: Spray Applications
- EM 9266: Chemical Control of Spotted-wing Drosophila: Insecticide Efficacy
- EM 9267: Monitoring Techniques for Spotted-wing Drosophila
- EM 9268: Potential Impacts of Irrigation on Biocontrol on Spotted-wing Drosophila Populations
- EM 9269: Biocontrol of Spotted-wing Drosophila
Some highlights:
- When temperatures rise above 50°F (10°C) for more than five consecutive days, [SWD] populations can increase.
- During hot summer periods, most activity, including egg laying, occurs during dusk and dawn.
- SWD egg laying is more elevated in shady, humid portions of the crop canopy.
- Temperatures on weed fabric are less optimal for the survival of pupating SWD larvae.
- Key fruit characteristics indicating susceptibility to SWD are firmness and °Brix (sugar). Increasing sugar and decreasing firmness are correlated with increased susceptibility to SWD damage.
- Most spotted-wing drosophila (SWD) are found in the center of the fruit crop canopy, where they find shade, cooler temperatures and higher humidity.
- Early in the growing season, insecticides can be applied less often, with up to 14 days between applications.
- Spray intervals should be shortened for late-ripening crops, when environmental conditions speed the SWD life cycle.