Location: Horticultural Crops Research2011 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.
3. Progress Report
Drosophila suzukii is a serious threat to small fruit crops throughout the western United States. The most effective monitoring and treatment options for this pest are unknown. The overall objectives of this project were to field test monitoring protocols, collect and analyze field data and quickly disseminate this information to researchers and growers. Effective monitoring has the potential to minimize the economic damage and limit ineffective and/or ill timed pesticide applications while supporting the efforts of other researchers to develop effective monitoring and management protocols. There’s a wide variation in berry crops and cropping systems (organic, sustainable, conventional, fresh local, fresh for shipping, processed for individually quick frozen, processed for puree, etc.) that will be affected differently and have different economic thresholds for this pest. Therefore, it is necessary to modify basic treatment options, monitoring and economic assessment tools to fit specific situations. We assembled a representative sampling of fields, which covered the major berry crops and cropping systems, and scouted weekly. We tracked D. suzukii populations, testing various monitoring techniques and evaluated treatment option efficacy. Catches of adult D. suzukii did not begin to rise until mid-June. The population increased rapidly after that, with the largest number of flies and larvae toward the end of August and into September. Growers applied a number of insecticides. Applications of pyrethroids, organophosphates and spinosysns provided the highest and most consistent levels of control. The development of effective monitoring and treatment options for this pest will ensure high quality fruit with minimal insecticide inputs. The project was monitored by meetings, e-mail, and phone calls.