BEAUTY OF WINTER LANDSCAPE:
Choose From a Variety of Plants
by Dixie Sandborn, Michigan State University Extension
How to Grow Bare Root Trees
State Agencies Ask People To Check For The Woolly Adelgid
Identifying trees just got easier with Leafsnap, an app developed by Columbia University, the University of Maryland, and the Smithsonian Institution.
This free app combines electronic field guides with image-recognition software to identify common tree species from photos taken of their leaves.
It is available on iPhone and iPad, but not yet available on Android.
Frost glistening from the branches to a dusting of snow on the tips of evergreens, the beauty of plants in the winter is endless. Take note of winter landscapes and what characteristics you most enjoy. Note branching habits, color, unusual bark, persisting seeds and berries, or swaying seed heads of ornamental grasses. These features keep our landscapes alive and interesting throughout the winter months.
[Red Osier Dogwood, otherwise known as the Red Twig Dogwood] Winter is a great time to appreciate landscape plants for more than their flowers and foliage. Many landscape plants have beauty we only can enjoy during the winter. It may be the exfoliating bark of the River Birch, the bright red stems of Red Twig Dogwood or the red berries against the rigid leaves of holly. There are thousands of plants for landscape winter interest. Don’t forget the grasses and other small rock garden plants. Other winter-loving plants show their beauty in the early spring, with colorful flowers bursting out against the starkness of the season. Winter landscapes have much to offer. Not only is there beauty in the plants, they offer habitat and food for wildlife.
The next time you are selecting plants for your landscape, be sure to consider the winter beauty. There are many great plants to choose from for a Michigan winter. Most of Michigan is in zone 5 according to the USDA Hardiness Zone map.
Here are some excellent plants for winter interest in your landscape:
Paperbark Maple (Acer grisium)
Threadleaf Japanese Maple (Acer palmatum dissectum)
Red Chokeberry (Aronia arbutifolia)
Blue Atlas Cedar (Cedrus atlantica “Glauca”)
Harry Lauder’s Walking Stick (Corylus avellana “Contorta”)
Winter Daphne (Daphne odora) Fragrant
Common Snow Drops (Galanthus nivalis)
Wintergreen (Gaultheria procumbens)
Christmas Rose (Helleboris niger)
Chinese witch-hazel (Hamamelis mollis)
Winterberry Holly (Ilex verticillata) Need female and male plant
Christmas fern (Polystichum acrostichoides)
Michigan winters are long, but having the beauty of plants reminds us spring will be here soon. For now, get out and enjoy what the Michigan landscape has to offer.
This article was published by Michigan State University Extension. For more information, visithttp://www.msue.msu.edu.
The hemlock woolly adelgid (HWA) is a serious threat to Michigan’s eastern hemlock, and forest health experts from the Michigan Department of Natural Resources and Michigan Department of Agriculture and Rural Development are asking residents in west Michigan to check their trees for this harmful insect.
These tiny insects secrete white wax as they feed on sap. HWA feeding also can kill needles, shoots and branches. Over time, growth slows as trees become less vigorous. Eventually, infected trees may take on a grayish-green appearance. HWA often kills infested trees when combined with other stress factors, such as drought.
Hemlock woolly adelgid has been found in several locations in Park, Port Sheldon and Spring Lake townships in Ottawa County, as well as in Norton Shores and Whitehall in Muskegon County.
Efforts to find additional HWA locations are ramping up across the state. In cooperation with MDARD, Michigan State University and others, DNR staff this winter will be searching for HWA in state parks, state game areas and eastern hemlock trees all over Michigan.
"We’re asking for assistance from the public in detecting occurrences of hemlock woolly adelgid in Michigan,” said Roger Mech, DNR forest health specialist. “While people are out enjoying our natural resources, we hope they’ll take a moment to check their trees.”
Quickly detecting and eliminating HWA is critical to slowing the spread of this insect. Eggs and very young adelgids can be carried by birds and can be moved on people’s clothing, hemlock nursery trees, logs or firewood.
Hemlock trees can be protected from HWA with proper insecticide treatments.
“Citizen involvement in reporting and treating HWA is crucial for the future of hemlock trees in Michigan,” said John Bedford, MDARD Pest Response Program specialist. “Examine your hemlocks, or have them examined by a qualified arborist and, if HWA is found, treat them or have them treated.”
Eastern hemlock is an essential component of Michigan’s forests. Hemlock also is a critical component of wildlife habitat. Brook trout, for example, are more common in streams running through hemlock forests. More than 12 percent (2.3 million acres) of Michigan’s forests contain eastern hemlock.
A statewide response strategy requires knowing precisely where hemlock woolly adelgid occurs. The insects have entered Michigan several times in the past decade from HWA-infested areas of the U.S. Each time HWA has been detected in Michigan, MDARD, the DNR, MSU and the U.S. Forest Service have joined forces to address this threat.
If you find a possible HWA infestation, take photos, note the location of the affected trees and contact MDARD at800-292-3939 or MDA-info@mic higan.gov. To prevent spread, do not move the potentially infested material.
For more information about hemlock woolly adelgid, visit the Forest Service’s Forest Health Protection website:http://na.fs.fed.us/fh p/hwa/. For information about treatments, go to www.michigan.gov/hwa.
Boxwood Blight is a very fast spreading disease caused by the fungus Cylindrocladium which affects members of the Buxaceae family including Boxwoods and Pachysandra. This disease spreads by sticky spores which means they do not spread long distances by wind but are spread most commonly by splashing water, plant debris, and sticking to any surface that might come in contact with. These spores may remain alive for up to 10 years. Infected crops will eventually die from this disease so preventative practices are of the utmost importance.
Symptoms of Boxwood Blight include:
>White puffs on the stems and undersides of the leaves
>Brownish spotting on leaves
>Dark lesions on stems
>Partial or total defoliation of plants
>No visible symptoms on the roots
Unfortunately, these symptoms are the same as common Boxwood diseases, which means Boxwood Blight cannot positively be identified except for laboratory testing. If you suspect your Boxwood may be infected, send a sample directly to a lab.
1. Unpack your trees, remove all packing materials, carefully untangle the roots and soak the roots in water 3 to 6 hours. Do not allow the roots to dry out.
2. Dig a hole, wider than seems necessary, so the roots can grow outward without crowding. Remove any grass within a 3-foot circular area. To aid root growth, turn soil in an area up to 3 feet in diameter.
3. Plant the tree at the same depth it stood in the nursery, with plenty of room for the roots. Partially fill the hole, firming the soil around the lower roots. Do not add soil amendments such as peat or bark. Do not use fertilizer, potting soil, or chemicals on your new trees.
4. Shovel in the remaining soil. It should be firmly but not tightly packed. Construct a water-holding basin around the tree. Give the tree plenty of water.
5. After the water has soaked in, spread protective mulch two inches deep in a 3-foot diameter area around the base of the tree, but not touching the trunk.
6. The soil and mulch around your trees should be kept moist but not soggy. During dry weather, generously water the tree every 7 to 10 days during the first year. Water slowly at the dripline.
Planting Location: To give your trees the best start, we recommend planting in a protected area with worked-up soil such as a garden. After 1 to 2 years, simply transplant to the permanent location when the trees are dormant.
Signs of Dormancy: Plant or transplant your trees when they are dormant. In fall: after the leaves have dropped or, on evergreen trees, when light-brown clusters form on the top. In early spring: before leaves or new growth appear.
Carefully Separate Your Trees: There will be more than one tree in your package. Remove the plastic bag around the roots and the twist tie holding your trees together. Separate your trees, carefully untangling the roots. Please note that the roots have been covered with a hydrating gel which keeps them moist during shipment.
Depth and Distance of Holes: Measure the roots of each tree. Dig one hole for each tree 1 foot wide and 1 inch deeper than the roots. Holes should be 2-1/2 feet apart.
Fertilizer? Do not use fertilizer, potting soil, or chemicals on your baby trees. Such products will kill your young trees.
Watering: Keeping your baby trees watered is important during their first year. Keep the soil and mulch moist but not soggy. In dry weather, you should water generously every 7 to 10 days. The water should soak into the soil and mulch. Avoid watering so much that you see standing water.
Protection: We recommend putting a fence (such as chicken wire) around your trees if your site is a feeding ground for rabbits, deer, or other wildlife.
Have an oak tree on your property? To keep it healthy, don’t prune it from mid-April through the summer. That’s a key time for infection with oak wilt, a serious disease that can weaken white oaks and kill red oak trees within weeks.
Oak wilt, caused by a fungus, has been reported throughout the Midwest, including Michigan, said Ryan Wheeler, invasive species biologist with the Michigan Department of Natural Resources.
Red oaks are most susceptible to the disease. These trees have leaves with pointed tips and include black oak, northern red oak and northern pin oak. Trees in the white oak group have rounded leaf edges and include white oak and swamp white oak. They are less susceptible.
Symptoms most often appear from June until September.
"Affected trees will suddenly begin to wilt from the top down, rapidly dropping leaves, which can be green, brown or a combination of both colors," Wheeler said.
Oak wilt is spread above ground mainly by sap-feeding beetles that carry the disease spores from an infected tree, or wood cut from an infected tree, to fresh wounds, including pruning cuts, on healthy trees. The infection also spreads below ground, through root grafts among neighboring trees.
The highest risk of infection occurs April 15-July 15, but it is prudent to avoid pruning or injuring oak trees until they have lost leaves for the winter, typically from November through mid-March, Wheeler said. If you must prune or remove oaks during the risk period, or have a tree that gets damaged, immediately cover wounds with tree-wound paint or latex-based paint.
Don’t move firewood, especially if it comes from oak wilt-killed trees, as it can harbor the fungus If you suspect your firewood is tainted by oak wilt, cover it with a plastic tarp all the way to the ground, leaving no openings. This keeps beetles away so they can’t move spores from the firewood to otherwise healthy trees. Once the firewood has been cut long enough, to the point where all of the bark loosens, the disease can no longer be spread.
If you suspect your oak trees have this disease:
Get help from an oak-wilt qualified specialist. Visit www.MichiganOakWilt.org for a listing and more information.
Michigan State University’s Diagnostic Clinic can verify infection. Find instructions athttps://pestid.msu.edu/ or call 517-355-4536.
Report infections to DNR-FRD-Forest-Health@michigan.gov or by phone at 517-284-5895; you also can use the MISIN website or mobile app.
Avoid oak wilt: Don't prune or injure oak trees during greatest risk period here.
TIPS FOR TREES AND SHRUBS