From Invasives

ODA Announces 2018 Gypsy Moth Treatment Project Open Houses

While all is quite in the gypsy moth’s world, much preparation is occurring in Ohio to manage future gypsy moth populations this year as part of the two programs ODA administers:  Slow-The-Spread and Suppression.  Recently ODA released the schedule for their 2018 Gypsy Moth Treatment Open Houses and the 2018 Treatment Maps. Treatment blocks have been identified and are planned in19 Ohio Counties. Treatments will occur after caterpillars hatch this spring and when weather conditions are favorable.  Treatments are made to protect trees from damage from the leaf feeding caterpillars like seen…

Published on
Amy Stone

USDA Updates Emerald Ash Borer Map, January 2018

While emerald ash borer (EAB) may be considered “old-news” in the buckeye state, many may want to keep a watchful eye on its progression beyond Ohio. Each month, USDA APHIS produces an updated EAB Detection Map. Occasionally, we like to post these updated maps on BYGL for those that are interested in monitoring the spread of the pest in North America.


The most recent additions to the map include:

  • initial county detections in: St. Clair and Talladega Counties, Alabama; Queens County, New York; and Eau…
Published on
Amy Stone

ODA Announces New Finds of Hemlock Woolly Adelgid in Ohio in Athens, Geauga and Lake Counties

Earlier today, the Ohio Department of Agriculture (ODA) the Ohio Department of Natural Resources(ODNR) announced the discovery of a hemlock-killing pest in Lake, Geauga and Athens counties. The hemlock woolly adelgid (HWA) is a small, aphid-like insect native to Asia, which threatens the health and sustainability of two hemlock tree species native to the eastern United States.


HWA was first reported in the eastern United States in 1951 near Richmond, Virginia. Today, it is established in portions of 20 states from…

Published on
Amy Stone

Thousand Cankers Disease (TCD) of walnut has been confirmed in Butler County, Ohio

Thousand Cankers Disease (TCD) of walnut has been confirmed in Butler County, Ohio.  The disease is caused by a fungus (Geosmithia sp.) that is carried from tree to tree by the Walnut Twig Beetle (Pityophthorus juglandis); a type of bark beetle.  Here is a quote from the news release from the Ohio Department of Agriculture (ODA):

Walnut Twig Beetle was first confirmed in Ohio in late 2012 in traps set by Ohio Department of Natural Resources Division of Forestry officials in Butler County.  Additionally, scientists from the Ohio Plant Diagnostic Network, a cooperative partnership between ODA and The Ohio State University, recently isolated the TCD fungus from walnut branch samples from the Butler County area, marking the first time TCD has been confirmed in Ohio.”


Keep a sharp eye out for the signs and symptoms of TCD on walnut:  chlorotic and wilted leaves, twig and branch dieback, thinning canopy, and epicormic growth.  Unfortunately, the current leaf chlorosis and leaf drop from walnut anthracnose may confuse the issue.  We will have a report on TCD in this week’s Buckeye Yard and Garden Line (BYGL); the online version ( ) will include images.

Please report suspicious walnut trees to the ODA at 855‐252‐6450 or by email at



Disease-carrying beetle found in Southwest Ohio

A beetle known for spreading disease among walnut trees has been found in Butler County.

Eight … Walnut Twig Beetles were recently caught in traps set by wildlife officials at a lumber processing facility, according to an announcement Monday from the Ohio Department of Natural Resources Division of Forestry and the Ohio Department of Agriculture.  The Walnut Twig Beetle carries a fungus that causes Thousand Cankers Disease. The disease infects and can ultimately kill walnut trees.  Read more here>>>

Asian Longhorn Beetle statement on Tate Township infestation

To: Dr. Brendon Reardon

Re:  USDA, APHIS Environmental Assessment (EA) for eradicating Asian longhorned beetle (ALB) from Clermont County, Ohio

Dear Dr. Reardon,

I have studied the assessment document, attended classes and meetings on this issue, and followed the discussion and debate.    

As an ISA certified arborist and consulting arborist, my role is to help people to make management decisions regarding how to best care for their trees and shrubs and examine costs vs. benefits.  I do treat trees, but I do not remove them, so I have little or no financial stake in how this issue is decided, except for the potential devastation which would fall upon many of my clients and my community if containment were to fail and the infestation were to spread.  The assessment document comprehensively outlines the science and details of various alternatives to address this Asian Longhorned Beetle (ALB) infestation so I will not repeat that, except to say that leaving lightly infested trees would very likely lead to much larger and more complicated longer term infestations affecting vastly larger populations.  

It bears noting that very loud special interests in the Bethel area are putting forth an activist campaign, in some cases spreading misinformation, and maligning those who disagree with them.  This is an important consideration in the decision making process.  Having heard and read statements from several members of this group, at least a few of them seemingly intentionally misstate the science to suit their purposes and publicly malign key players such as Ohio State University Extension specialist Joe Boggs.  It is very sad that the debate has not been civil and people I know to be sincere, science based researchers are being maligned in such ways. 

There is a very large and important constituent group you are not likely to hear a lot from.  30 miles west of this infestation lies a metro area of close to 2 million people.  While activists attempt to stuff the ballot box, this large population to the west sits by unaware, and certainly not participating in this comment process.  Most I have spoken with routinely mix up information on ALB and Emerald Ash Borer(EAB) and have little or no understanding of the ALB black cloud lying to their east.  Many of these same people are facing thousands of dollars in ash treatment or removal expenses, sitting in sub-divisions built into mature woodlands of ash, but also maples and other trees susceptible to ALB. They have no idea of the crippling economic impact they face if insufficient steps are taken to address the problem farther east.  

I read information in the document about decreased property values.  What I did not see much of was the direct economic impact to individuals and communities due to containment failure.  If the infestation spreads beyond a strategy of eradication, as EAB did, individuals and communities will become responsible for their own tree removal.  This cost would be staggering, likely well beyond what they could afford or manage.  Public safety would also be at risk as large trees would become increasingly unstable and failure prone.  Properties would be degraded and, as with EAB, communities would face removal costs which would be crippling. 

Anything less than full host removal is ill advised, in my opinion.  Full host removal while leaving lightly infested trees would be pointless since new, high infestations would inevitably occur.  To the extent that treatment of high risk hosts, combined with partial removal AND imidacloprid treatment, has been shown to be effective in other areas, some compromise strategies could be employed to moderate the immediate impact to local residents within the infestation.  However, methods employed should be methodologies proven to work in other infestations, not high risk courses of action based upon emotion-laden misstatements by special interest activists and politicians lobbying for re-election.  

The price of failure in this endeavor is far too high.  I feel for those people directly impacted by the infestation, and the losses they are enduring, but that does not justify endangering the rest of the population and society.  


Ronald E. Rothhaas, Jr.

Arbor Doctor, LLC

Member,  American Society of Consulting Arborists,

International Society of Arboriculture

ISA Certified Arborist, OH-5177A

ISA Certified Tree Risk Assessor PNW – 1332

B.S. Horticulture Interpretation, The Ohio State University

A.A.B. Ornamental Horticulture, Cincinnati State Technical and Community College

Prevent misinformation from killing your trees

Without complete eradication of the Asian Longhorn Beetle in Clermont County, your trees could be at great risk.  Some special interests are spreading misinformation in a misguided effort to protect their own trees.  Public comment is currently being accepted.  This DOES affect you insofar as spread of the beetle would kill millions of trees, including ALL maples, and there are not effective insecticides available to stop it.

The Asian longhorned beetle (ALB) grows and lays its eggs in many types of hardwood trees. In the United States, the beetles prefer the following species:




European mountain ash

Goldenrain tree



London planetree

Maple  (favored)





The Environmental Assessment (EA) regarding eradication activities for the Asian longhorned beetle (ALB) from the Clermont County  area is currently available for comment through Monday, July 9. Individuals can access the document through the following link: . Anyone wishing to comment on the document should send their remarks to  Dr. Reardon by July 9,  or at 4700 River Road, Unit 137, Riverdale, MD 20737

ODA Adds Second Ohio County to the Hemlock Wooly Adelgid Quarantine


The Ohio Department of Agriculture (ODA) and the Ohio Department of Natural Resources (ODNR) announced on May 7, 2012 a discovery of a hemlock‐killing pest in Washington County in southeast Ohio.  Hemlock woolly adelgid (HWA) is a small, aphid‐like insect native to Asia that threatens the health and sustainability of eastern hemlock and Carolina hemlock in the eastern United States.  Read more>>>

When Beetles, Blights, Borers and Mildew attack!

How will we solve Boxwood Blight and the next new pest?Our industry has seen a significant increase in the rate of introduction of new pest and disease threats. Recent threats like Emerald Ash Borer and P. ramorum (so-called Sudden Oak Death) have spread quickly, causing significant disruption to trade and costly losses to inventory, sales and in the landscape.
This spring we face two new threats that have already proven devastating in Europe: Boxwood Blight and Impatiens Downy Mildew. With cuts in government spending tightening up on already limited research dollars, and other threatened industries and conservationists eying our industry as the threat, not the solution, we rely on a strong nationally coordinated plan of attack. National efforts need to direct both research priorities and regulatory approaches to ensure an efficient and effective response that protects our businesses from disruption, particularly during busy sales seasons.

Click here to watch as ANLA’s Washington Impact series takes a look at how a national effort can help our industry face new threats and provides an update on the Boxwood Blight threat. For a deeper look at the research and regulatory plan to fight Boxwood Blight, click here.

Officials Confirm First Detection of Boxwood Blight in Ohio


REYNOLDSBURG, Ohio (Mar. 26, 2012)—The Ohio Department of Agriculture (ODA) today announced the discovery of boxwood blight at the Red Mill Farm of Losely Nursery in Lake County in northeast Ohio. Boxwood blight is a disease caused by a fungus (Cylindrocladium pseudonaviculatum) that threatens the health and sustainability of boxwood plants. This is the first detection of boxwood blight in Ohio.

Boxwood blight was first detected in the United States in North Carolina in October 2011. Plant pathologists in the United Kingdom first identified the disease in the mid‐1990’s. It is unclear how the disease was introduced into the United States. To date, Ohio is the 10th state to identify boxwood blight. The suspect infection was reported to inspectors with the ODA and the Ohio Plant Diagnostic Network (OPDN) who then sent samples to the United States Department of Agriculture –Animal Plant Health Inspection Service (USDA APHIS) for confirmation.

Officials at this time are unsure how the disease was introduced into the Red Mill Farm. ODA inspectors have issued a restriction on all boxwood plants located at the Red Mill Farm and will be conducting further sampling. “Although it is unfortunate to have confirmation on the farm, all known infected plants have been destroyed and we are working with the Ohio Department of Agriculture to prevent any further spread of boxwood blight” said Andrew Harding, Vice President and General Manager of Herman Losely and Son, Inc. This disease is spread primarily by water (rain splash, irrigation, runoff, etc.), by the movement of plant material in the trade, and through contaminated tools, vehicles, boots, etc. Initial symptoms of the disease on boxwood plants include leaf spots and blights, rapid defoliation, distinctive black cankers on stems, and severe dieback. Most boxwood plants are not killed by the disease, but will become so defoliated as to be aesthetically unacceptable.


Note to Editor: For more information on boxwood blight, please refer to the attached fact sheet

provided by the Connecticut Agricultural Experiment Station.

Media Contact: Brett Gates, Public Information Officer, 6147529712

SW Ohio Invasive Plant Control Workshop at Sharon Woods Park

Exotic bush honeysuckle, tree-of-heaven, and even flowering pear are a problem in southwest Ohio and are putting our urban forests into decline (even mature stands).  If you want to learn why they are a problem, how to identify these invasive plants, and learn the best way to deal with this problem, attend the SW Ohio Invasive Plant Control Workshop at Hamilton County Park District’s Sharon Woods Park on Saturday, March 17, 2012 from8:30am – 3:00pm 

  • What are the most invasive plants in SW Ohio
  • How can you control invasive plants
  • Roundtable discussions for professional land managers and for less experienced weed warriors
  • Guided walking tours with hands on demos
  • Lunch included

Sponsored by:  Green Umbrella, Ohio Invasive Plants Council, and Hamilton County Park District.   Please register by March 15, 2012: to or call 513-850-9585.

February 8, 2012 Clermont County, Ohio, Asian Longhorn Beetle infestation update

As the investigation continues the extent of the infestation grows.  It is now thought that the infestation is 7 or 8 years old:

2,721 Number of ALB infested trees removed as of 2/4/12 (since removals starting on 11/14/11)

6,417 Number of ALB infested trees confirmed as of 2/4/12 (since detection on 6/17/11)

83,417 Number of trees surveyed as of 2/4/12 (since surveys began on 7/1/11)

56 Square‐miles under regulation; see “Regulated Area” map: