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5 Little-Known Benefits of Urban Forests that Boost Quality of Life

By John Campanini

Urban forestry is vital to the health and well-being of today’s cities and towns. Technically, urban forestry includes planting, maintaining, caring for, and protecting trees in urban areas. It also includes the planned connections of the city’s green spaces, including landscaped boulevards, parks gardens, side tree boxes, and river and coastal walkways. Put simply, Urban forestry makes a difference in our lives often without us knowing it.

Urban forestry recognizes that trees are a critical part of a city’s urban infrastructure—from individual street trees and urban green spaces to shady school groves and suburban forests. Urban forests comprise much of America’s canopy. Altogether, over 140 million acres of America’s landscape are in the country’s cities and towns. Rhode Island is notable for its 286,000 acres of urban and community land with 52% overall tree cover.

Rhode Island also is among the top five of all US states for urban and community land as a percent of total state land area. Forests in Rhode Island cover 56% or 368,373 acres of state land. An estimated 213 acres or 58% of the state’s forested land is considered core forest, defined as blocks of forested land greater than 250 acres in size. The state’s 38,000 private landowners collectively control about 68% of the state’s forestland.

Benefits of Urban Forests

The Value of Rhode Island’s Forests, a joint project of the Rhode Island Advisory Committee and the Rhode Island Tree Council, provides a more in-depth look at what the state’s forests contribute to the community. The project was developed for the RI DEM Division of Forest Environment and made possible with funding from the USDA Forest Service. Below are some little-known benefits that Urban forestry in the state provide:

·         Trees cut air pollution.

Trees generate their food by combing carbon dioxide (CO2), water, sunlight, and soil elements. The process cleanses our atmosphere and releases oxygen for us to breathe. Trees also trap particular pollutants, like ash, pollen, smoke, and dust, and absorb CO2 and other dangerous gases harmful to living beings. Plus, trees produce enough oxygen on each acre for 18 people daily.

·         Trees fight the greenhouse effect

The greenhouse effect occurs when our atmosphere prevents heat from the sun from radiating back into space by air-polluting gases. That boosts temperatures globally and threatens everyone on the planet. Trees reduce the greenhouse effect. They shade homes and office buildings, cut air conditioning needs by about 30%, and reduce the impact the burning of fossil fuels for electricity has on our atmosphere.

·         Trees conserve water, cut soil erosion

If cities lacked trees, they’d have to increase sewerage and storm water drainage channels and add waste treatment capacities to deal with more water runoff. That can boost a city’s infrastructure costs dramatically. Trees help cut those costs. Tree roots, for example, increase soil permeability. That, in turn, reduces surface runoff of water from storms, cuts soil erosion and sedimentation, increases groundwater recharge, and reduces wind erosion of soil.

·         Trees reduce heat-related health problems

Excessive heat and airborne pollutants can dramatically increase health-related problems within an urban community. Trees reduce these problems. The moderate city temperatures decrease respiratory ailments caused by lowering airborne pollutants and supply relief in an often-stressful city life. Residents are also encouraged to walk in their neighborhoods daily when a beautiful tree landscape exists. This activity keeps people fit and encourages social interactions.

·         Trees boost economic stability

Cities that feature significant urban forestry thrive compared to those that don’t. Studies show that have an expanded urban forest:

  • Attractive more businesses and tourists
  • Help landlords rent apartments and offices faster
  • Boost employee productivity while cutting absenteeism
  • Encourage shoppers to shop longer along tree-lined streets
  • Boost a city’s pride and community spirit

Trees also help block or absorb city noise in an urban environment and help create a positive first impression among visitors.

Practical, Productive, and Practicable

The five items mentioned above are just some of the benefits urban forests provide. They also decrease crime, lower levels of social disorder, boost commercial property values, increase perceptions of safety, moderate local climate, and provide forage for humans and animals. These benefits grow over time. Trees strategically planted and maintained over time can generate returns up to three times the costs of planting and maintaining them.

Put simply, urban forests are not only productive and cost-effective but also practical and healthy. They provide economic, physical, social, emotional, and psychological benefits to a city’s residents. They also provide benefits for children. A recent study indicates the more interaction children with ADD have with nature, the more manageable their symptoms. With all these things going for urban forests, creating more of them makes sense.

 John Campanini is technical director of the Rhode Island Tree Council (RITree). A graduate of the University of Rhode Island, he was city forester for Providence for more than twenty years before retiring.

Tips on Caring for Big Trees

Big trees are under siege from a variety of threats. They need attention and care. Here are some tips on how to care for big, old trees:

  • Protect the bark from damage from yard equipment
  • Spread mulch around the base to insulate the soil
  • Avoid compacting the ground around a big tree
  • Keep branches free from hanging things
  • Water when dry to avoid stress when it’s hot

Also, big trees should be inspected by a certified arborist periodically. The arborist can spot trouble early, like diseases, rot, and heavy dead branches. He or she can also spot problems early and recommend pruning or other measures that can preserve the tree’s life.

Trending Pests and Weather Conditions Impacting Plants

The following is an excerpt of the lecture presented by RI Tree Council’s Technical Advisor, John T Campanini, Jr at the RI Federation of Garden Clubs Annual Education Day Program- Roger Williams Park Casino, November 4, 2019. The lecture’s title was “Trending Pests and Weather Conditions Impacting Plants.” In this article, I abridge my earlier lecture to examine specific pests which loom as future threats to woody ornamentals.

PLANT PESTS- There are five plant pests that should be on the radar of all plant stewards in 2020. Four are insects while the last is a disease causing fungus. They are itemized below:

  • Asian Long-horned Beetle (ALB- Anoplophora glabripennis)
  • Spotted Lanternfly (SLF- Lycorma delicatula)
  • Emerald Ash Borer (EAB- Agrilus plannipennis)
  • Bagworm (Thyridopteryx ephemeraeformis)
  • Boxwood Blight Disease

The ALB is by the #1 pest threat of hardwood trees including maple, birch, willow and elm in the Northeast according to the US-Forest Service. ALB kills trees by tunneling through the wood. Once the tree is infested it must be destroyed. The bittersweet news is while this pest has yet to be found in Rhode Island it is everywhere around us. It was discovered attacking trees in Worcester, MA in 2008 and in Boston in 2016. By imposing a quarantine on moving wood products and by inspecting vulnerable species, the Commonwealth has done a super job of containing the spread of this destructive pest into other New England States. Early detection is paramount to its management. In winter, the most obvious sign of this pest infesting host plants is the presence of numerous dime-sized, round holes on the trunk and on branches. For more information about ALB, visit http://www.na.fs.fed.us/spfo/alb.

Photo 1: The Asian Lon-horned Beetle adult is about ¾ to 1 ¼” long with mottled spots on the back. Note the dime-sized exit hole made by adult beetles as they emerge from the tree.

The Emerald Ash Borer is an exotic beetle from Asia discovered in 2002 feeding on ash trees in Michigan. Since then this small, bright green beetle has been responsible for the loss of millions of ash trees in North America. In July 2017, adult beetles were discovered in bait traps set out by RIDEM plant health inspectors in Westerly, Providence, Lincoln and Woonsocket, RI. These findings show the EAB is here, and that ash species are at risk. Plant damage and death is caused by the worm-like larval stage of EAB. The larva feed on the inner bark and phloem, creating “S” –shaped galleries. The feeding activity destroys the plant’s ability to transport water and nutrients to other parts of the tree, killing it. Unlike the ALB, there are options for protecting ash trees from EAB damage. But these options require comprehensive planning and should be directed with the assistance of a certified arborist. Learn about these options and more on EAB at www.emeraldashborer.info.

Photo 2: EAB adult beetles are smaller than a penny. They emerge in July to feed on ash leaves before laying their eggs between layers of bark and in bark crevices.

The Spotted Lanternfly is the latest exotic pest discovered in the United States with the potential to become a major plant problem. This sap-feeding plant-hopper was discovered attacking fruit trees, woody ornamentals and timber crops in Pennsylvania in 2014. New York and Connecticut authorities have also reported finding adults feeding on nursery stock in the past two years. SLF nymphs and adults are very colorful making them easy to detect. Young nymphs are “tick-like” with black and white spots. As they age, the nymphs develop red patches and grow to ½” long. The adults have two sets of wings. The forewing is gray with black spots. The hindwings are bright red at the base. Both nymphs and adults cause damage by feeding in huge populations (swarming) on the tissues under the bark of the trunk and branches. Plants literally starve to death from nutrient depletion from this type of voracious feeding. To learn more on the SLF, visit: www.uri.edu/biocontrol/spotted-lanternfly.

Photo 3: The important life stages of the Spotted Lantern-fly: eggs, wingless nymphs and the adult with wings for flight.

The bagworm is a native insect that, until recently, was mostly found in Pennsylvania and south. In the past decade, however, it has migrated to Northern areas through infested nursery stock. For years the bagworm was considered just a nuisance in RI with scattered outbreaks here and there. But, as the winters have gotten milder, this pest has learned to adapt and thrive and is today much more common. The bagworm prefers attacking evergreens. They include Arborvitae, Juniper, Leyland Cypress, Spruce and Pine. Certain deciduous species such as Black locust, Honeylocust and American Sycamore are also known host plants. The pest damage is done by the worm-like larvae. They feed on needles and leaves from late May through July. This causes the plant foliage to discolor yellow, turn brown before eventually dying. Plant injury can be very severe and entire plants can be killed in a single season. Bagworm infestations generally go undetected until damage is complete, and the large bags constructed by this pest is conspicuous. The bags provide over-wintering shelter to the egg-laying female adults inside. A simple control measure is to remove and destroy these bags as they appear. The other is to apply Captain Jack’s Dead-bug Spray (i.e., Spinosad) to the plant from early to mid-June while the larvae are small. For more bagworm details, visit www.info.psu.edu/extension/factsheets/bagworm.

Photo 4: The tell-tale sign of bagworm infestation is the dangling of inch long, oval-shaped bags from the twigs of plants.

The last pest problem we will discuss is one that is causing great harm to the nursery industry as well as public and private landscapes and gardens where boxwood (Buxus sp.) is grown. The culprit is the fungus, Calonectria pseudonavicilata. It causes the fungal disease called Boxwood Blight. Boxwood Blight was confirmed for the first time in North America in 2011 on samples collected in North Carolina and Connecticut. Today, this disease is found in more than 25 states, including Rhode Island. Hosts of the fungus include plants in the Buxaceae family. American, English and Korean boxwoods are all susceptible. Disease symptoms begin as dark leaf spots that coalesce to form brown blotches. Rapid defoliation usually follows, starting on the lower branches and moving upward in the canopy. As the disease progresses, black cankers girdle the stems, killing them. There is no easy way to control this disease. Fungicides are effective at protecting plants from boxwood blight infection, but do not cure plants with the disease. For now, the best advice to help prevent introducing the boxwood blight fungus is to avoid introducing new boxwood plants to landscapes that already have established boxwoods. Find out more about boxwood blight at www.ext.vt.edu/agriculture/commercial-horticulture/boxwood-blight.html.

Photo 5: Boxwood blight has become a serious threat to nursery production and to boxwoods in the landscape.

Finally, the RI Tree Council has staff available to present lectures or workshops on many topics from plant selection to plant health care. The Tree Council also publishes a monthly newsletter, ROOT TIPS, during the annual plant growing season (April to October) providing invaluable information on the weather, pest alerts and tree and shrubbery management. To avail yourself of these or other offerings such as the Tree Council’s signature Tree Stewards Education Course, contact us by phone 401-764-5885 by e-mail ritree@ritree.org, or visit the website www.ritree.org.