Fruit Production: Spotted Winged Drosophila
Since the invasive insect pest spotted wing Drosophila (SWD) (Drosophila suzukii) arrived in Michigan in 2010, it has been a major concern for Michigan fruit industries.
MSU Extension Action
- In 2015, statewide surveys were sent to industry stakeholders to assess the impact of SWD extension efforts. Surveys indicated that:
- 73 percent increased their management costs due to SWD.
- 92 percent used the weekly MSU Extension SWD trapping report to help make management decisions.
- 76 percent altered their insecticide program based on monitoring information from their region.
- 69 percent changed their management practices when trap catches increased in their region.
- The majority of growers had no crop losses to SWD. › These survey results indicate that timely, cost-effective and reliable management of SWD is of high importance to Michigan fruit growers. Continued MSU Extension SWD programming is critical to assist growers with SWD management decisions that results in high quality and marketable fruit.
- MSU Extension SWD programs reduced the number of insecticide applications made in blueberries in 2015 by one spray compared with 2014. Pest management costs also decreased to $215 per acre, $44 less per acre spent in 2014 and $157 less than in 2013.
Fruit IPM update programs reached over 800 Michigan fruit producers who look to MSU Extension for production recommendations during the growing season. A total of 76 meetings were held across the state in 2015: 32 Northwest Michigan Tree Fruit IPM Updates, five Northwest First Friday Grape Grower Meetings, 11 Southwest Michigan Fruit IPM Meetings, 23 Fruit Ridge Tree Fruit meetings, and seven Blueberry IPM Meetings. As a result of these IPM meetings:
- 89 percent of producers scouted on farms for pests/diseases to make management decisions.
- 65 percent of producers referred to MSU Enviro-weather pest and disease models to determine the need for pesticide application.
- 80 percent of producers relied on MSU’s SWD trapping program to guide their management decisions.
- 44 farms adopted SWD integrated pest management (IPM) practices and 22 additional farms adopted recommended management practices after receiving SWD education.
- MSU Extension fruit researchers and educators have hosted annual SWD Summits to address the cherry industry priorities for SWD research and extension. In 2015, 124 attendees participated in an educational program and needs assessment, and stated the meeting was effective and informative.
- A two-day Spanish and English language SWD training workshop hosted 44 participants to help reach diverse audiences.
- Several programs were made available online through a web conference system.
- SWD publications were made available through regional and statewide outlets, including email newsletters and MSU Extension News.
- The SWD website (ipm.msu.edu/SWD.htm) provides instant, 24/7 access to SWD information.