This newsletter is designed to keep managers and other users up-to-date with recently completed and ongoing research by RMRS scientists, as well as to highlight breaking news related to invasive species issues. The newsletter is produced by the RMRS Invasive Species Working Group (ISWG), a core group of scientists who volunteer to disseminate RMRS invasive species science to managers and the public through this newsletter, the website, and periodic white papers. All of our products, including past issues of the newsletter and lists of publications, can be found online at: https://www.fs.fed.us/ rmrs/groups/invasive-species-working-group. In this issue, we report on new research covering a variety of topics from secondary weed invasions and drought effects on pollinators to discovering and utilizing host plant resistance to combat invasive fungi. As always, we welcome feedback on ways to improve the ISWG and this newsletter.