Summer is a Great Time for Home Lawn Care!

A fundamental aspect of managing any pest is correctly identifying it. Historically, identifying weeds has involved using some form of a taxonomic tool. Fortunately, technology has advanced significantly in assisting with plant identification; several free and paid mobile applications are now available to the public. PictureThis and iNaturalist apps both have free versions that rely on some form of community-supported identification. Major phone manufacturers are also increasing photo recognition abilities in their camera apps. Android uses Google Lens to search the internet for similar-appearing photos to help identify a plant or other object. Apple's IOS uses Visual Look Up to perform a function similar to Google's.

Each of these platforms has its advantages and disadvantages, and each should be used with a healthy dose of skepticism. Unfortunately, these apps are not very reliable at correctly identifying grasses, so they are somewhat limited to broadleaf plants. Remember that these apps are simply a tool to help you correctly identify a plant. They will likely improve in accuracy as cameras and computer processing improve over time. 

Photo: Recent digital tools, such as Google Lens, can be used to identify weed species effectively. Photo by Jon Trappe, UMN Extension Educator

Read the full article in the latest edition of the "Home Lawn Care Newsletter" from the University of Minnesota Turgrass Science. Other topics include encouraging better rooting through improved watering practices, utilizing technology to identify weed species reliably, and learning how to manage your lawn for moles, as well as upcoming events. For more information, contact Becky Wozny, Wetland Specialist, at This email address is being protected from spambots. You need JavaScript enabled to view it..  

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How You Can Help the Bees, Butterflies and Birds

When confronted with something eating your prized tomato plant, sometimes our first instinct is to pick up the bottle of pest spray. Oftentimes, we don't even realize that the plants we've purchased contain neonicotinoids, which are systemic (within) the plants' leaves, stems, flowers, nectar, and fruit. These 'neonics' are highly effective in killing pests, but they lack discrimination, and mounting evidence suggests they are contributing to the decline in pollinator numbers. An alternative is called IPM or Integrated Pest Management. The concept is to address pest infestations as they occur and manage pest damage on an as-needed basis, rather than chemically on a predetermined schedule.  

Cultural practices may include:

  • Is it a pest? Many of our most beautiful butterflies will use our garden or yard as a source of food, as well as caterpillars! If you can't identify the insect snacking on your plant, try contacting the Anoka County Extension Service for help with identification or go online. There are free apps that can help identify many insects, including iNaturalist, which can also help identify plants
  • Regular compost additions to maintain a healthy population of soil organisms
  • Crop rotation to avoid inadvertently helping pests thrive via monoculture
  • Companion planting to attract beneficial insects while reducing the attraction of pests
  • Using physical barriers like fine mesh netting and row covers to prevent pests from reaching crops
  • Hand removing larger pests from plants when practical, Japanese beetles are a good example. Late afternoon is a good time to find these bugs and dispose of them in soapy water.
  • Maintaining garden hygiene by removing diseased and end-of-season vegetation from the garden and disposing of it properly.

Biological and habitat controls include:

  • Importing predators and parasitoids that prey on the pests of concern. Note that specific pests demand specific predators and predators need a food source to stay in the garden area. Generally, if you have managed your garden then the 'good' insects will naturally find their way to your garden and assist with pest control.
  • Maintaining a chemical-free habitat that is welcoming to beneficials and pollinators
  • Using resistant plant varieties means researching and selecting the best available hybrids that are resistant to likely pest challenges.

When nothing else works and damage levels warrant continued action, research the organic and manufactured chemical options for the specific pest in question. Insecticidal soaps are a good option for many sucking and chewing pests. Neem oil is similarly safe on food with no dangerous residues while killing or reducing pests, powdery mildew, and other fungal infestations. If all else fails and traditional pesticides are used, follow label directions carefully, use them minimally, and avoid spraying open flowers and applying them during the day when pollinator activity is highest.

Birds (such as this ruby-throated hummingbird seeking nectar from these flowers), reptiles, and mammals can also transport pollen. (Photo by Sparky Stensaas)

The Harder Path is the Right Path

As is often the case, the more convenient approach — using neonicotinoids and other chemicals on a widespread basis in anticipation of pest problems — is seductive but ultimately harmful in the long term. Damage to pollinators, faster evolution of resistant pests and replacement of natural processes with chemicals are all costs that eventually have to be faced. The IPM approach requires more work and acceptance of a certain amount of pest damage. We must reduce and manage the use of neonicotinoids and other agricultural chemicals, as their long-term impact will be far more harmful than beneficial. Do it for the bees. Do it for the butterflies. Do it for the birds. Do it for you.

An excellent resource for more information is the University of Michigan's website: https://ncipmhort.cfans.umn.edu/ipm-bmp-cultural-control/vegetable-garden-best-management-practices-pollinators.

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Leaf Diseases on Broadleaf Trees - Rampant but Mostly Harmless

You may have observed a major difference between this year and our last few growing seasons: plenty of precipitation. According to the DNR's Climatology Office, the amount of rain that's fallen from April through August 2024 has been nearly the most on record over a good share of Minnesota. Overall, this is good news for our forests – but all that near- historic rainfall has had additional impacts to trees. 

Photo: Severe apple scab on crabapple trees resulting leaf loss from the lower canopy.

As shoots and leaves emerge in the spring, they're particularly susceptible to infection from fungal pathogens. Extremely wet weather during this timeframe promotes sporulation (formation of spores) of these microscopic fungi, and rain spreads the spores around. The end result is a slew of common leaf diseases that we've seen in 2024. 

Photo: Bur oak blight in mid-September. Note the rim of healthier green leaves.
Photo: Severe leaf infection on a quaking aspen in mid-August.
Photo: Marssonina leaf blight on quaking aspen. An impacted clone on left and a tolerant clone on right. 
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Creating Wildlife Habitat in your Backyard can be Simple!

Planting native plants and nectar-rich flowers, supplying food and water sources, and avoiding pesticides are some of the keystones for attracting wildlife to your garden. Different species of pollinator prefer different shapes of flowers. Some like flat clusters of tiny flowers, and others seek out trumpet-shaped blossoms. Native plants such as coneflower, New England aster, and butterfly weed offer a variety of flower shapes to attract a variety of wildlife. Planting indigenous flowers and grasses among native trees and shrubs creates a self-sustaining environment. Plus, native plants require less maintenance than non-native species because they are better suited to the soil and climate. 

Photo Credit: Bryan E. McCay

Keep an eye out for invasive plants that may try to sneak into your garden. These include purple loosestrife, Japanese knotweed, crown vetch, and multiflora rose, all of which can spread rampantly. There are free apps you can download to help you identify plant species. A pond can provide refreshing drinks for wildlife and habitat for fish, frogs, and other water-loving creatures. Thoughtfully placed plants, including hardy water lilies and arrowhead in and around the water are key ingredients for a healthy ecosystem.

Bird baths are a simple way to attract wildlife, especially feathered friends who appreciate a place to safely drink and bathe.Birds prefer shallow basins no more than 2 inches deep with a rough surface for good gripping. For protection against lurking cats and other predators, place a bird bath a few feet from a tree or shrub so that the area immediately surrounding it is open yet close enough to sheltered perches for quick getaways. 

While adult butterflies fly from flower to flower sipping sweet nectar, their wriggly offspring are content to feast on a single host plant. Parental instinct guides each species to lay eggs on the plants their offspring favor. Favorite caterpillar cuisine includes parsley, dill, fennel, milkweed, willow, Queen Anne's lace, spicebush, and white clover. Pesticides can cause harm to the butterflies and bees you're trying to support. If you plant a diverse mix of plants, especially natives, pests are unlikely to do much damage to your garden so it's best to accept a little imperfection just let nature take its course.

Birds such as robins, brown thrashers, and cedar waxwings flock to landscapes that feature fruit-bearing trees and shrubs. Native species that fit into yards large and small include serviceberry, crabapple, and hawthorn. Don't try to do all this at once! Pick one project this summer and add it to your yard. You'll notice the change immediately. As time goes on; you can keep modifying and make changes as you go. Enjoy! Learn more from the source article or contact Becky Wozney, Wetland Specialist, at This email address is being protected from spambots. You need JavaScript enabled to view it. 

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Seven Options for Replacing your Ash Trees

Adapted from: Matthew Russell is a Minnesota Extension specialist in forest resources.

Emerald ash borer (EAB) has left a wake of dead ash trees throughout 4.3 million acres across the state. Minnesota forests are home to three native ash species. Unfortunately, all of these ash trees are susceptible to EAB. Here are seven native tree species that you can research for replacing your ash. Each species has its own unique characteristics and are adapted to different environmental conditions.

American Elm (disease-resistant elm varieties) Like ash, elms can tolerate wet conditions. Elms are slightly different in that they require full sun for the best growth.

Quaking Aspen Aspen sprouts vigorously, a form of reproduction without using seeds. It is often one of the first species to come back to an area after a timber harvest or fire.

Northern White Cedar In its natural habitat, it can form dense stands and survives well in moist soils. Northern white cedar trees will attract wildlife. Cedar trees are a favorite of white-tailed deer.

Swamp Oak This species can tolerate heavy and wet soil, which makes it a good replacement for black ash. While native only to southeastern Minnesota, swamp white oak is known as a climate change "winner" and has been planted with success in research trials in northern Minnesota.

Hackberry It can survive heat and drought or wind and ice, making it suitable for Minnesota's climate. In its native habitat it can be found in floodplains and along rivers in the central and southern portions of the state.

Silver and Red Maple are common in southern Minnesota and grow into the north-central part of the state, typically along rivers. These maples are widely planted as a shade or ornamental trees. Silver maples leaves are are green on top and "silvery" on bottom and red maple leaves turn a brilliant red in the fall, giving the trees their names.

River Birch can thrive in floodplains and near stream banks. River birch can be a single or multi-stemmed tree, making it a great tree to consider for the landscape around your home. Its copper-colored bark makes it stand out from other common trees.

Diversifying the types of species you plant in your yard or woodland gives you reassurance that your landscape can survive future insect and disease outbreaks. For more options, Extension's replacement trees for ash page can help you figure out which trees will grow well in your plant community. Consult an arborist or forester for more advice to make sure you plant the right trees in the right spot.
For more information contact Becky Wozney, Wetland Specialist, at This email address is being protected from spambots. You need JavaScript enabled to view it.

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