Spotted-wing drosophila (SWD, Drosophila suzukii) is an invasive pest of soft skinned fruit in the United States and has been detected throughout the southeast. Infestations were observed in some blueberries. SWD damage is similar to blueberry maggot. Female flies lay their eggs in ripening and ripe fruit, and larvae develop internally. SWD larvae are much smaller than blueberry maggot larvae, and unlike blueberry maggot, SWD can have multiple, overlapping generations during blueberry harvest. Therefore, risk of SWD may be higher than blueberry maggot. Adult male SWD can be distinguished from native, non pest Drosophila spp. by a single spot on the end of both wings. Females can be distinguished by their relatively large and heavily serrated ovipositor. Traps may indicate SWD presence on your farm, but do not predict fruit infestation. If SWD has been found on or near your farm, preventative insecticide applications are recommended beginning when fruit begins to color through the end of harvest. Insecticides should be applied at least weekly and reapplied after rain events. Rotate insecticides from IRAC Groups (color-coded below) with each application to minimize resistance risks. Work with your marketer to be sure you fully comply with export regulations for recipient countries of choice. [THE LABEL IS THE LAW – Always read the label and follow label directions] (Efficacy Ratings: E = Excellent, G = Good, F = Fair)
UGA Suggested Insecticide Regime for Spotted-Wing Drosophila (SWD) Control in Blueberries￼
Dr. Ash Sial is Professor of Entomology at the University of Georgia. He received his B.S. from University of Arid Agriculture Rawalpindi (Pakistan), M.S. from University of Greenwich (United Kingdom), and Ph.D. Entomology from Washington State University (United States of America). Dr. Sial worked as a postdoctoral research associate at University of California Berkeley and Cornell University before accepting a faculty position at the University of Georgia. At UGA, he holds research, extension, teaching, and service appointment in department of entomology and also serves as IPM Coordinator for the state of Georgia. His research program seeks to investigate biology and ecology of economically important insect pests and utilize that information to develop more sustainable IPM programs in small fruits. In his current role as a fruit entomologist, he works closely with blueberry growers throughout the state of Georgia to determine their pest management needs and help them develop and implement environmentally sustainable and economically viable IPM programs. His research program has successfully secured over $32.1 million in competitive grants through federal and state agencies as well as private industry. He has authored over 200 research and extension publications, over 276 presentations including 43 invited seminars, 13 webinars, and 3 keynote addresses, created several educational materials including blogs, websites, and smartphone apps, and organized 21 symposia at the national and international conferences. His research program has been highlighted multiple times in print and broadcast media including national radio and television. He has extensive record of serving professional organizations in a leadership role at the regional, national and international level. Dr. Sial has served on the Entomological Society of America (ESA) Student Affairs Committee (Chair – 2010), the ESA Program Committee (2010), ESA Committee on Early Career Professionals (2013-15), ESA Pacific Branch (Program Chair – 2013) and Southeastern Branch (Program Chair – 2017), UGA Department of Entomology Seminar Committee (2015 – 2019), Southern Region Technical Committee on IPM (Chair – 2015-16 and 2021-22), Sponsorship Committee for International Congress of Entomology (2016), and Program Committee for the 9th and 10th International IPM Symposium (2018, 2022, 2025). Dr. Sial has received 39 awards for excellence in research, extension, and teaching, as well as professional leadership and service at regional and national level including WSU President’s Award 2009, John Henry Comstock Award 2010, Future Leader in IPM 2016, ESA-SEB Excellence in Early Career Award 2019, IPM Team Award 2019, ESA Science Policy Fellow 2021, ESA-SEB Distinguished Achievement Award in Horticultural Entomology 2023, and ESA P-IE IPM Team Award 2023.