Southeastern Ornamental Horticulture Production and Integrated Pest Management
News alerts and tips from Southeastern universities.
On February 22, 2016 The USDA Animal and Plant Health Inspection Service (APHIS) added Barrow, Cherokee, Douglas, Fannin, Habersham, Murray, and White Counties in Georgia to the list of regulated areas for the Emerald Ash Borer (EAB). The Federal Quarantine specifically regulates the interstate movement of EAB-host wood and wood products from the quarantined areas in Georgia including firewood of all hardwood species, nursery stock, green lumber, waste, compost, and chips of ash species.
There are now 19 Georgia counties under the EAB Regulatory Quarantine. See The Georgia Forestry Commissionhttp://www.gfc.state.ga.us/forest-management/forest-health/eab/index.cfm or Georgia Department of Agriculture website http://www.agr.georgia.gov/emerald-ash-borer-eab.aspx for a map and list of the regulated Georgia counties and for information about EAB identification, damage symptoms, photographs, life cycle and quarantine regulations.
The Emerald Ash Borer (EAB) is a non-native and highly invasive insect that has killed tens of millions of ash trees in 25 states and in Canada since it was first discovered near Detroit, Michigan in 2002. It is thought that EAB was accidently introduced into the U.S. from Southeast Asia in infested shipping containers and materials. EAB kills both vigorously growing and weakened ash trees.
After seeing insect and disease issues very early this season, it would be timely to review scouting plug trays. A good program can reduce your costs, losses and headaches significantly. Co-authors Dr. Jean Woodward and Dr. Paul Thomas explain how to approach this methodology.
See the full article HERE.
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Brazilian Pepper has been found in Georgia! This is the first known reporting of this species in the state. The Coastal Georgia CISMA’s SCA intern Gabby Phillips discovered the plant on the entrance to the Jekyll Island Causeway last week. See our EDDMapS record for pictures http://www.eddmaps.org/distribution/point.cfm?id=3215822. Attached is an info sheet if you are unfamiliar with this species. We will be treating the site this Thursday with the Jekyll Island Authority and the Georgia Forestry Commission. Now that it is in Georgia we will be ramping up detection of this species so be on the lookout for it.
Natural Resources Biologist
GA DNR Nongame Conserv. Sec.
This past week I confirmed GA’s first case of Boxwood blight in a residential landscape in the Buckhead area of Atlanta. I then visited a second Buckhead site and it too had boxwood blight.
Boxwood blight is not a federal or state regulated disease. It is however, a very devastating disease for landscapers and boxwood growers. The disease spreads quickly and easily. It is often introduced into nurseries and landscapes on infected plants; however, in one of the infected sites, the disease cannot be traced back to an introduced plant. The landscape was likely infected by workers pruning boxwoods or installing annual flowers within the landscape bed. This means that there are likely other landscapes that are infected that we don’t know about yet. The second landscape consisted of field- and container-grown plants originating from NC that were transplanted within the past two months. Almost all of the plants (100+) showed symptoms to some extent.
Also, last week infected boxwoods originating from Monrovia Nursery in Oregon were found in a retail garden center in Chattanooga, TN. All but 25 plants were recovered from that location. It is likely that some of these plants or other shipments from the same nursery have ended up in GA. As of yet, we have not found boxwood blight in any commercial production nursery in the state.
I wrote a disease alert/fact sheet for the industry on boxwood blight. You can access it here: http://plantpath.caes.uga.edu/extension/extension/documents/GABoxwoodBlightAlertv1.pdf
Be extra cautious about boxwood samples. We have seen a lot of dieback in boxwood across the state from winter injury, Phytophthora root disease, and Volutella blight. Boxwood blight symptoms usually develop rapidly. Leaf spots can develop within days of inoculation progressing to blackening of the stems, foliage death, and leaf drop within two weeks. However, much of the state has been dry and the disease progression within the Atlanta landscapes has been slower. Moisture is the key. If we enter into a period of late afternoon thunderstorms and high humidity, disease progression will be quicker.
There is no control for this disease other than removal of infected plants and strict sanitation to reduce disease spread. Fungicides are only preventative. They are ineffective in controlling the disease once present.
The Extension Plant Pathology for October is now available and has been posted here:
- Disease clinic report for September 2013
- Table of samples diagnosed a year ago in November 2012
- Anthracnose on pepper alert
- Vegetable spray guides and efficacy tables are posted online
- Dollar spot is still active
- Yellow bentgrass
- Bipolaris leaf spot on bermudagrass
- Summary of fungicides recently registered for ornamental disease control
- Rosellinia needle blight on hemlock
Exciting program and 2 days of tours!
- Disease clinic report for July and August 2013
- Table of disease samples diagnosed in September and October a year ago (2012)
- Turfgrass Disease Control: Emphasis on fall activities
- Bipolaris leaf and crown rot
- Large Patch
- Spring Dead Spot
- Fairy rings in turfgrass
- Methods to maximize efficacy of turfgrass fungicides
- Update on three ornamental/tree diseases of concern: Where are they now?
- Sudden Oak Death
- Thousand Cankers Disease
- Boxwood Blight
- Disease management for row crops nears end for 2013: What’s next?
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