When emerald ash borer swept through the Midwest it left three kinds of ash trees in its wake: the dead, the dying, and the diligently protected and thriving. The hunt was on for ways to stop this insect and save North America’s ash trees. Now, nearly 20 years later, not only do we have tools to fight this insect but we are developing better management techniques every day. Treating ash trees with emamectin benzoate has long been shown to be effective against emerald ash borer but new data shows that a single injection can last 3 growing seasons. Emamectin benzoate is injected into the trunk of a tree and travels throughout the live parts of leaves and stems. Insects that feed on this tissue are killed when they ingest the emamectin benzoate. Although this insecticide can kill adults in leaves for only 2 years, it lasts at least three years[Read More…]
Avoid injury from falling ash limbs by promptly removing dead and dying ash trees. Don’t do it yourself! Hire a professional to safely remove your brittle trees.
Sitting in your back yard on a warm day under the shade of a tree is one of the joys of spring, but there are a growing number of threats that could destroy this experience. Invasive species present dangers like those from above in the form of fragile dead ash trees and from below in the form of new tick species. Learning to prevent, protect, or recover from these pests can mitigate their devastation. Emerald Ash Borer University is an online webinar series produced by a partnership between three universities and the US Forest Service that allows listeners to learn about invasive species and ask questions of experts without leaving their home or office. All webinars are free and many can be used towards continuing education programs (contact Elizabeth Barnes for details). Can’t watch it live? No problem! All webinars are recorded and posted online after the talks. To register[Read More…]
Boxwoods have so many pests it’s a wonder we continue to grow them. On top of boxwood mites, psyllids, and leafminers boxwood blight has been spreading since 2011. Boxwoods are special though so we work to protect them from each new threat. That work will get harder if box tree moth gets established in North America. The box tree moth, Cydalima perspectalis, feeds on boxwoods (Buxus spp.). It is native to China, Korea, and other parts of Asia but was recently found at a couple of sites in Ontario, Canada. So far just the brown and white moths have been found. It remains to be seen if they laid enough eggs in enough places to initiate a lasting infestation. Box tree moth was introduced into Europe in 2007 and rapidly spread across the continent so its damage is well-documented. The caterpillars are yellow to lime green with dark stripes. They[Read More…]
Dusty looking spruce, arborvitae, boxwoods and rhododendrons in the fall could be signal the presence of cool season spider mites.
It’s never too early to protect your trees from gypsy moth! Across the Central and Northeastern US gypsy moths had a population boom this summer. Although we do not have firm predictions for next year yet, you can still start planning and protecting your trees now! Fall is the perfect time to check your property for gypsy moth eggs. Gypsy moths aren’t picky about where they lay their eggs. Look for them on trees, houses, trailers, fence posts, and other surfaces near your home. Usually, a few egg masses won’t severely damage your tree, but if you find more than 10 it’s time to start thinking about treatment options. Here are the two main methods for managing eggs. First, you can manually remove them by gently scraping them with a knife or paint scraper. Throw the eggs in soapy water or in your freezer. Leave them for two or more[Read More…]
Resources for managing and stopping spotted lanternfly are growing almost as quickly as this pest is spreading. We report on new resources for protecting your plants!
Eliminate stinging threats from ground nesting wasps by treating them at night when they are all tucked in their nests.
Control spider mites by mechanical control and improving conditions for predators and fungi. If needed, follow up with pesticides to rescue ailing plants.
Protect flowers from caterpillars through early detection and selective pesticides