PEST ALERT IN SOUTHWEST MISSOURI: FIRST SPOTTED WING DROSOPHILA CAPTURED BY MONITORING TRAPS
On June 6th, 2014, we received the report that the first Spotted Wing Drosophila (SWD) male has been captured by a monitoring trap deployed on a blueberry farm in the Webb City area. This finding means that farmers in the region are urged to start monitoring for this pest in their own orchards.
If you are interested in monitoring for SWD at your farm, free traps and bait (purchased using funds provided by a grant from the Missouri Department of Agriculture to the Lincoln University IPM program) are available. They can be mailed at no cost to you. Please contact Mr. Jacob Wilson at email@example.com or call (573-681-5591).
SHOULD I SPRAY INSECTICIDE AGAINST SWD AGAIN AFTER A RAINFALL?
Research has shown that the amount of rain that occurs right after the application of some of the main insecticides used against SWD affects the durability of the insecticide on the fruit. For example, Dr. Rufus Isaacs (entomologist at Michigan State University) and his team have documented that Malathion effectiveness decreases immediately one day after a rain greater than 0.5 inches; the effect was that SWD control was only around 20 percent of the control in another field not exposed to the rain. This means that Malathion’s efficacy was almost lost after 0.8 inches of rainfall. In their trials, after a 0.8 inch rainfall, Lannate 90SP kept nearly all of its effectiveness even after 7 days, whereas Mustang Max lost about 20% efficacy within 7 days after the rain event. In general, a 2-inch rain one day after the application will substantially reduce the effectiveness of most of the products.
Remember, the label is the law, so if it doesn't prohibit re-application a farmer can go back again in with a particular insecticide she/he may have applied before a rain event. Otherwise, she/he will need to switch products. Some products explicitly state that farmers need to wait a week or some other period between applications.
As an example, the label of Malathion 8F (Gowan, 79.5% active ingredient) has these comments for blueberries:
* The Maximum application rate is 1.25 pints of product per acre
* The maximum number of applications per year is three
* The minimum retreatment interval is 5 days
The take-home message is that if rainfall occurs after insecticide application, re-application is needed to maintain fruit protection, but check the product’s label.
If you are a commercial berry / grape producer, the 2014 Midwest Small Fruit and Grape Spray Guide (freely available as PDF in this URL: https://ag.purdue.edu/hla/Hort/Documents/ID-169.pdf ) lists the following products against SWD in blueberries: Brigade WSB (10WP), Danitol 2.4EC, Delegate 25WG, Entrust 2SC (organic), Entrust 80WP (organic), Imidan 70W, Lannate LV, Lannate SP, Malathion 8F, and Mustang Max 0.8EC.
No endorsement of products mentioned is intended nor is criticism implied of products not mentioned.
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