I GOT SWD IN MY MONITORING TRAPS, SHOULD I SPRAY MY CROP RIGHT AWAY?
There is now consensus among researchers that if monitoring traps detect the presence of SWD, commercial producers of highly susceptible small fruit crops should start spraying insecticide against SWD as soon as the first fruit become susceptible (i.e., color change) about about 2 to 3 weeks before cherry or berry harvest, depending on weather. A second application may be needed 7 to 10 days later. In the case of indeterminate fruiting berries such as raspberries or strawberries, sprays might need to be repeated to keep SWD populations low during summer and fall. Continue to use monitoring traps to help you decide if and when additional sprays might be needed. Be sure to wait the interval specified on the pesticide label (= Pre-Harvest Interval or PHI) before harvesting fruit.
IMPORTANT: Timing and good coverage are key components of an IPM program against SWD. Insecticide sprays need to be in place prior to oviposition (egg laying), and coverage needs to be thorough as the adults often hide in the denser portions of the canopy. So, high pressure and spray volume will be needed to reach these difficult-to-reach spots and provide thorough coverage. Even the best of the insecticides will not consistently last more than 7 days so, at a minimum, weekly applications are needed. Producers must rotate among insecticides with different modes of action (IRAC Group) to prevent/delay resistance. With a limited number of modes of action available, we cannot afford to lose the effectiveness of materials to insecticide resistance.
IPM is a comprehensive and environmentally-friendly approach to solving pest problems that rely on a combination of common sense preventive practices.
Examples include the use of resistant crop varieties, cultural practices such as sanitation, crop rotations, trap crops, and the creation of habitat for natural enemies and pollinators. Pest monitoring is a critical component of an IPM program. If needed, treatments are made using least-risk options to target the pest without negatively impacting beneficial arthropods and the environment.
The Lincoln University Cooperative Extension (LUCE) IPM Program aims at developing (through research) and promoting (through Extension) affordable alternative insect pest management strategies to combat insect pests of fruit and vegetables in Missouri. To access the LUCE IPM program website click here:
Dr. Jaime C. Pinero
Dr. Pinero received his Ph.D.in Entomology from the Univ. of Massachusetts--Amherst and a B.S. in Agronomy from the Universidad Veracruzana, Veracruz, Mexico. He now serves as an Assistant Professor/State IPM Specialist at Lincoln University Cooperative Extension & Research. His research interests focus on insect sensory ecology and behavior with an emphasis on Integrated Pest Management methods for improved production of fruits and vegetables.
CLICK HERE FOR ADDITIONAL INFORMATION ABOUT DR. PINERO'S RESEARCH, EXTENSION AND TEACHING RESPONSIBILITIES AT LINCOLN UNIVERSITY....
Other Relevant SWD resources
Michigan State University:
http://www.ipm.msu.edu/invasive species/spotted wing drosophila
North Carolina State University:
Oregon State University:
North Central IPM Center
Other Relevant BMSB resources
Michigan State University:
http://ipm.msu.edu/invasive species/brown marmorated stink bug