By Paul Cigan, DNR Forest Health Specialist, Hayward, Paul.Cigan@wisconsin.gov or 715-416-4920.
Emerald ash borer (EAB) has been discovered for the first time in Barron County, in the town of Lakeland. Dead and dying green ash were observed and larval specimens were subsequently lab-confirmed. Most of the green ash across a 20-acre area are either dead or dying from EAB attack.
Dead and dying green ash trees with characteristic woodpecker damage
By Bill McNee, DNR Forest Health Specialist, Oshkosh, bill.mcnee@wisconsin.gov or 920-360-0942
Heterobasidion root disease (HRD), formerly known as annosum root rot, was recently found in Fond du Lac and Racine counties for the first time. Thinned pine stands were surveyed by DNR forestry staff in four eastern counties where the disease had not been previously found (Fond du Lac, Manitowoc, Racine and Winnebago counties).
Counties where Heterobasidion root disease (HRD) has been found as of August 2021 are shown in green.
Continue reading “Heterobasidion Root Disease (HRD) Found In Fond Du Lac And Racine Counties”
By Linda Williams, DNR Forest Health Specialist, Woodruff, Linda.Williams@wisconsin.gov or 920-360-0665.
Symptoms of oak wilt are showing up. Look for leaves that suddenly wilt and drop from the tree. Oak wilt is a non-curable, fungal disease specific to oaks. Trees in the red oak family will die quickly from this disease, while trees in the white oak family will die more slowly, with a branch or portion of the crown becoming infected.
This tree is actively wilting from oak wilt infection and will drop most of its leaves within about 4-6 weeks.
By Linda Williams, DNR Forest Health Specialist, Woodruff, Linda.Williams@wisconsin.gov or 920-360-0665
Oak timberworm, Arrhenodes minutus, is a primitive weevil that can cause defects and degrade in red and white oak timber. They can also infest elm, poplar and beech. Egg-laying females will seek out trees that are damaged, wounded, nearly dead or recently dead. After the eggs hatch, the larvae bore across the grain through the tree then “U-turn” back across the grain to the point of origin, taking two or three years to complete their life cycle and creating a lumber defect called a wormhole. When infested wood is split for firewood, the weevils may emerge in homes or garages if they had already pupated when the firewood was split.
Male oak timberworm on a Northern red oak that was damaged in a storm.
By Linda Williams, DNR Forest Health Specialist, Woodruff, Linda.Williams@wisconsin.gov or 920-360-0665
Lacebugs are tiny, delicate-looking insects that can cause leaves to turn a little off-color. They are typically found feeding on the undersides of leaves, where they insert their mouthparts and suck the sap from the leaves. From the top of the leaves, these areas where the feeding damage occurs are stippled with small white or yellow specks, often in a generally circular pattern. Recently congregations of adult and nymph lacebugs were noted on the twigs of basswood, but it was unclear if they were feeding on the twigs or just resting there.
Lacebug adults and nymphs have congregated on this basswood twig.
By Linda Williams, DNR Forest Health Specialist, Woodruff, Linda.Williams@wisconsin.gov or 920-360-0665
Have you noticed small, white fluffy things floating through the air? If you have a chance to look closely at these small bits of fluff, you’ll see that they’re actually insects; these are woolly aphids. They produce waxy filaments that help them avoid predators that don’t want to chew on their fluffy excretions.
Woolly alder aphid group is protected by the waxy filaments covering them.
Continue reading “Woolly Aphids Observed And Reported On Social Media”
Plants that are pokey, viney or spread quickly across the landscape sometimes seem alarming when you discover them in your backyard or woods or when they’re spotted along the highway. Wild cucumber has all these characteristics but is not as ominous as it seems.
Wild cucumber (Echinocystis lobata) is a vine native across the U.S. and found throughout Wisconsin. It has maple-like star-shaped leaves and has pale greenish-white flowers from July through September. A single plant is self-fertile but can also be pollinated by bees, wasps and flies. It produces a pod-like fruit with spikes resembling a cucumber which is unsafe to eat. Each pod produces four seeds that fall to the ground when the pod is ripe. The pods may persist into the winter and become thin brown shells.
Star-shaped leaves, pale flowers, and cucumber fruit of wild cucumber. Photo: Bugwood
Cities, villages, towns, counties, tribes and 501(c)(3) nonprofit organizations in or conducting their project in Wisconsin are encouraged to apply for a regular or startup 2022 Department of Natural Resources Urban Forestry Grant!
The grants range from $1,000 to $25,000, and grant recipients must match each grant dollar for dollar. A startup grant of up to $5,000 is available for communities that want to start or restart a community forestry program. Grants are awarded to projects that align with state and national goals to increase the urban forest canopy and its benefits.
Continue reading “2022 DNR Urban Forestry Grant Application Now Open”
Registration is now open for UW-Madison, Division of Extension’s annual Urban Forestry Workshop, held Aug. 19 and Aug. 24-27.
This year’s workshop will be offered a little differently. The program usually includes a classroom lecture-style session in the morning and hands-on field activities in the afternoon. This year Extension will hold the morning portion of the workshop online to allow more attendees and offer an educational option for those who are not yet comfortable attending in-person events. The hands-on activities will build on the online session, but you are not required to attend the online session to attend the in-person portion of the class.
Continue reading “2021 Urban Forestry Workshop: Trees, Construction And Site Development”
We deeply appreciate the commitment to urban forestry demonstrated by our 2020 Tree City, Tree Campus and Tree Line USA participants. Thank you for your hard work!
2020 Tree City USA Communities – City (years): Adams (26), Albany (17), Algoma (20), Allouez (25), Altoona, City of (2), Amery (5), Amherst (24), Antigo (28), Appleton (37), Ashwaubenon (28), Athens, Village of (2), Baraboo (29), Barron (3), Bayfield (21), Bayside (13), Beaver Dam (30), Belgium (9), Bellevue (18), Beloit (33), Beliot, Town of (4), Brillion (21), Bristol (9), Brodhead (8), Brookfield (23), Brooklyn, Village of (8), Brown Deer (24), Cambridge (15), Cedarburg (31),
Continue reading “Recognizing Wisconsin’s Tree City, Tree Campus And Tree Line USA Participants”
