Helpful Information for Residents
Invasive Insect Threatens Ash Trees
A new threat has come to New Jersey and it could be devastating. Emerald ash borer (Agrilus planipennis Fairmairet), an invasive insect native to Asia, has killed hundreds of millions of ash trees (Fraxinus species) in urban, rural and forested settings. This beetle was first identified in 2002 in southeast Michigan and Windsor, Ontario. As of October 2018, emerald ash borer (EAB) infestations were found in 35 states as well as five Canadian provinces.
Through March 20, 2019, emerald ash borer has been found in New Jersey in Bergen, Burlington, Camden, Essex, Hudson, Hunterdon, Mercer, Middlesex, Monmouth, Morris, Passaic, Somerset, Sussex and Warren counties, according to the NJ Department of Environmental Protection (DEP). As a consequence, the DEP warns that even if emerald ash borer has not yet been detected, all ash trees are considered to be at high risk of EAB infestation within the next few years.
Ash trees can be infested by the emerald ash borer years before the tree begins to show symptoms of infestation, which begins when female beetles lay eggs on the bark of ash trees. The eggs hatch and larvae bore into the bark to vessels underneath that carry fluid.
As the larvae feed and develop, they cut off the flow of nutrients, eventually killing the tree within three to five years. Symptoms of infestation include canopy dieback, woodpecker activity, missing bark, D-shaped exit holes, shoots sprouting from the trunk, and S-shaped larval galleries under the bark. The ash borer has killed hundreds of millions of trees in North America.
If an ash tree is already infested or in poor health, it may be best to remove the tree before it poses a hazard to people and surrounding structures, according to the NJ DEP. Communities, businesses, and residents with high-value, healthy ash trees can treat the trees before any infestation occurs.
Anyone who sees emerald ash borer or suspected evidence of tree damage is urged to call the New Jersey Department of Agriculture as soon as possible at (609) 406-6939 or a DEP forest health specialist at (609) 984-3861.
Several insecticide options are available to protect landscape ash trees threatened by EAB. A Certified Tree Expert or Forester can help evaluate, treat or remove impacted ash trees. Call the Board of Certified Tree Experts at (732) 833-0325 or e-mail email@example.com for a list of tree professionals serving your area.
After receiving a Community Forestry Grant two years ago, the Berkeley Heights Environmental Commission awarded a contract to Tamke Tree Experts of Bernards Township to inspect and then select ash trees along the Township's right of way to treat for emerald ash borer.
"Not all ash trees along the right of way were treated," said Environmental Commissioner Richard Leister. "Small ash trees will be removed and any large ash trees that may be compromised will be marked for removal."
Residents are also encouraged to treat ash trees on their own property. Detailed information for homeowners, including how to identify if an ash tree is affected, is at http://www.nj.gov/agriculture/divisions/pi/prog/eabhomeowners.html
Keep up with Berkeley Heights Environmental Commission activities on its Facebook page: https://www.facebook.com/BerkeleyHeightsEnvironmentalCommission
Here’s how to identify an ash tree:
The ash borer is about ½” long and 1/8” wide:
Watch Out for Tree Volcanoes
It’s spring, and homeowners and landscapers are preparing their gardens, pruning their trees and shrubs, and mulching. The NJ Shade Tree Federation recommends that the best mulches for trees are shredded pine or hardwood bark at least 3/8” in size, pine needles, one-year old wood chips, or shredded and composted leaves. But the Federation warns against building volcanoes on tree trunks. Instead, start six inches from the tree trunk and mulch outward to the edge of the dripline. Keep the mulch about 3 inches deep. You may use woven landscape fabric or newspaper under the mulch in heavy weed areas. But don’t use plastic under the mulch.
Lawn Fertilization Tips
When you’re fertilizing the lawn, remember you’re not just fertilizing the lawn
Now that the warmer weather is here, many of us are thinking about fertilizing our lawns, to restore them to that perfect early-summer green. But run-off from lawns and gardens can carry nutrients – especially phosphorus and nitrogen – into our streams and rivers, where they can cause blue-green algae to proliferate. These algal “blooms” can spoil the water quality, disrupt the environment for other wild creatures, and produce odor and toxins that may be unpleasant or even harmful to people and pets.
You can minimize the impact of your lawn treatments on the natural environment by:
- Not applying fertilizer when a runoff-producing rainfall is expected or when the soil is already saturated;
- Ensuring you don’t spread or spill fertilizers on impervious surfaces;
- Avoiding the use of phosphorus-containing fertilizers altogether;
- Mulching tree leaves and grass clippings as alternatives to synthetic fertilizers – mulching grass clippings instead of bagging them reduces the need for fertilizer by as much as one-half;
- For properties adjacent to streams and other bodies of water, maintaining a buffer of natural vegetation along the water’s edge to filter runoff.