FIELD SCOUTING TO ASSESS TREATMENT EFFICACY AND MONITORING PROTOCOLS FOR THE SPOTTED WING DROSOPHILA
Horticultural Crops Research
2013 Annual Report
1a.Objectives (from AD-416):
1) Field test various techniques for monitoring the presence and population dynamics of spotted wing Drosophila in the field.
2) Assess the effectiveness of chemical applications (both chemistries and treatment interval) on fly control and maintainence of fruit quality.
3) Deseminate research results real-time via AgReports (PCM web based scouting system)
1b.Approach (from AD-416):
• We will meet with growers and identify cooperators in early spring and have follow up meetings with participants in fall to discuss successes and failures of the program.
• We will train and supervise seasonal scouts to sample specific fields for SWD on a weekly basis from March 1st until October 1st.
• Scout locations:
o SW Washington and the Willamette Valley, OR (5 scout days per week total)
o Crops scouted will include strawberries, blackberries, raspberries and blueberries. Scouting will take place in each crop from fruit set thru harvest
• Approximately 5-6 fields could be covered for each scouting day budgeted. The number of actual fields per day per area will depend on logistics of monitoring protocols and travel time.
• Scouts will be directly supervised by Denny Bruck, Tom Peerbolt and Jana Lee to follow the trapping and scouting procedures outlined below.
• Scouts in all areas will follow identical weekly protocols and enter data and comments into AgReports (PCM web based scouting system) on the same day as site visit.
• Field data with scout comments will be posted within one day of visiting the site in a password protected area that would be accessible to all SWD berry researchers and extension agents. Researchers and extension agents would be able to adjust protocols/recommendations during the season in reaction to data received.Formerly 5358-22000-032-19G (12/10). Formerly 5358-22000-036-05G (8/2011).
This research was conducted in support of NP 304 objective 2B of the parent project. The spotted wing drosophila (SWD) was first detected in the North American mainland and Europe in 2008-2010 and is a serious economic pest to stone and small fruits. To understand the phenology and habitat of the fly, we monitored for SWD for three years in various crop types and from 63-72 fields. In 2010 and 2011, adult SWD did not begin to be trapped until mid-June, with rapid increases to high numbers toward the end of August. In 2012, flies were regularly detected early in the season and continued to be caught in rising numbers with a spike in August. To control the fly, we tested the efficacy of common insecticides. For conventional pesticides, Mustang Max provided ~14+ days of residual adult control followed by Malathion with ~7-10 days. Neonicotinoids do not seem to perform well against adult SWD. For organic pesticides, Entrust provided ~5-7 days of residual adult control whereas Pyganic provided no residual control but was a good contact poison for adult SWD. To quickly disseminate the information, we posted results via our web-based scouting system.