Neem oil is effective against the young Colorado potato beetle larvae, but it is less effective against large larvae and adult beetles. Neem breaks down rapidly and must be reapplied frequently. To help manage Colorado potato beetle while using environmentally friendly neem, plant resistant varieties, rotate crops and manually remove larvae and adults from leaves.
About the Author
Elizabeth McNelis has been writing gardening, cooking, parenting and homeschooling articles from her St. Petersburg urban homestead since 2006. She is the editor of “The Perspective,” a homeschooling newsletter distributed in Pinellas County, Fla. and writes a blog entitled Little Farm in the Big City. McNelis holds a Bachelor of Arts in professional and technical writing from the University of South Florida.