The 2021 Scouting and Program has officially kicked off at our disease and insect pest monitoring site at UVM Horticulture Research and Education Center. This program will provide growers with Vermont-specific information throughout the growing season, about the population dynamics of important diseases and insect pests that you all identified as high priority.
The leek moth flight of the season started, and they will begin mating and laying eggs on overwintering garlic and other alliums as they are planted this spring. Typically, this first flight doesn't result in significant damage, though newly transplanted alliums as well as garlic scapes can be disproportionally affected because of the timing of the resulting first larval generation. Management options include exclusion with row cover and chemical controls. Covering plants with row cover at night will exclude the nocturnal female moths from laying eggs. Where this is not feasible or cost effective, chemical controls can be applied. Spinosad (Entrust, organic) and spinetoram (Radiant SC, conventional) have been shown to be effective chemical controls but must be time timed appropriately. For more information about leek moth in general, check out the Leek Moth Information Center website (https://nysipm.cornell.edu/agriculture/vegetables/leek-moth-information-center). For growers interested in doing their own leek moth monitoring, we are providing leek moth trap setups along with a season’s worth of lures, free of charge (while supplies last), in exchange for sharing your monitoring data via an online submission page.
Scott A. Lewins
Entomology Extension Educator
University of Vermont
117 Jeffords Hall, Burlington, VT 05405