Eric Burkness, Mary Rogers and Bill Hutchison, Departments of Horticultural Science and Entomology
In a typical growing season, spotted wing drosophila (SWD) trap catch begins at approximately 755 degree days (DD), using a 50° F base temperature, as the flies begin seeking out and attacking a wide range of wild and cultivated small fruit that begins to ripen in mid to late June. In 2023, we have already surpassed 755 DD at both the Rosemount and St. Paul experiment stations in MN with DDs through June 22nd of 920 and 928, respectively. As of June 22, we still have not detected SWD in either of those trapping locations.
Previous research has shown that SWD mating, and egg lay,
will be reduced and may cease when temperatures exceed 86° F
and as temperatures increase eggs that are laid may not hatch. Despite the
adverse weather conditions, SWD infestations could still develop where conditions
aren’t as severe, especially in high tunnels or with greenhouse grown fruit
crops. Therefore, using a trap on your farm to follow local SWD activity can be
extremely valuable in making management decisions, especially as we continue to
see significant changes in the environmental conditions during the growing
season. For more information on SWD identification, management, and trapping
visit https://fruitedge.umn.edu/spotted-wing-drosophila.
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