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Kanuga – 18th Ornamental Workshop on Diseases and Insects

18th Ornamental Workshop on Diseases and Insects

Old Friends, New Foes

Kanuga Conference Center
130 Kanuga Chapel Drive
Hendersonville, NC

September 24 – 28, 2012

2012 Keynote talks include:

A Decade Plus of Boxwood Blight Research.  Bjorn Gehesquière, Institute for Agricultural and Fisheries Research, Merelbeke, BELGIUM.

Disasters by Design:  Destabilization of Insect Populations in the Urban Environment. Daniel A. Herms, Ohio State University, Wooster.

The workshop is hosted by the Department of Plant Pathology and
the Department of Entomology at North Carolina State University

IR-4 Survey for Horticulture

The 2012/2013 Grower and Extension Survey is now available online. This survey is critical in deciding the IR-4 research priorities for ornamental horticulture. It outlines the pest management needs and will be a main component of the 2013 Workshop discussions.
As you fill out the questionaire, focus your thoughts on disease, pest, and weed problems that are difficult to manage because there are not enough pest management options. 
Please feel free to forward this survey to other interested people.
Thanks for helping IR-4 help the green industry!

Mobile App Adds New High-Tech Tool to the Gardeners Toolbox

Knoxville, Tenn. – Gardeners are known for having all the right tools to tackle the toughest landscape challenges. Now there is a high-tech tool at their fingertips that will help keep them aware of pests as they develop over the season, as well as provide them how-to information on insect and disease management, pruning and fertilization schedules, and more. The tool is not your typical gardening tool, but an app called IPMLite available for both iPhone and Android platforms.

Much smaller and lighter than gardening books and cheaper than a yearly subscription to a gardening magazine, IPMLite offers immediate access, right in the landscape, to current pest and plant disease information, plant care recommendations, and IPMLite alerts users when destructive pests emerge in their locations.

“Avid gardeners crave sound information on plant care and pests. We built IPMLite to give them just that,” explained Amy Fulcher, lead developer and University of Tennessee Institute of Agriculture assistant professor in the Department of Plant Sciences. “IPMLite includes all the information they need condensed down into a quick, easy-to-read format and great images.”  It features real-time alerts to gardeners and homeowners so they can stay on top of emerging pests and timely plant care.”

IPMLite enables users to:

  • Receive text-like alerts for time-sensitive pest issues and plant care – alert date adjusted to location so they are always aware of current pest issues
    • View images, pest lifecycle, and management options for major pests of woody plants
    • Reference how-to information and images of cultural practices
      • Track pests and cultural practices in calendar view or a chronological list


“The information is so good, and it is written in understandable language for the person looking for a solution to their home gardening problems,” explained Master Gardener Faye Beck, whose own gardens have twice been featured in Fine Gardening magazine. “The pictures are very clear. I can see where this app would be invaluable to the Master Gardeners who respond to questions from the public, or the home gardener to know more about cures for their gardening problems or questions. I think this will be a valuable tool for landscapers and gardeners too.”

IPMLite, or Integrated Pest Management Lite, was developed through a collaborative effort of horticulturists, entomologists and plant pathologists at seven land-grant universities. The University of Tennessee Institute of Agriculture, working with Clemson University, University of Georgia, University of Kentucky, University of Maryland, North Carolina State University and Virginia Polytechnic Institute, developed the first Integrated Pest Management mobile app, IPMPro, for nursery growers, landscapers, arborists and educators that includes alerts, major horticultural practices, and disease and insect information, as well as pesticide recommendations and electronic recordkeeping for professionals. Now the developers are introducing IPMLite for the homeowner.

IPMLite was built for the USDA Plant Hardiness Zones 4 through 8 (with capability for Zone 9a and 9b), which includes 20-plus states from west of the Mississippi River, east and north to Pennsylvania and New Jersey, and south to the Gulf Coast.

IPMPro and IPMLite are the first applications of their kind developed in the United States, and development was made possible through funding by the University of Tennessee Institute of Agriculture, through its Extension and AgResearch units, and support from the University of Tennessee Research Foundation.

For less than a subscription for non-interactive tools with quickly dated content like books and magazines that professionals and home gardeners currently use, IPMPro is $24.99 and IPMLite is $9.99 and are available through Apple (iPhone and iPad) and Android marketplaces. For more information, visit and


The University of Tennessee Institute of Agriculture provides instruction, research and public service through the UT College of Agricultural Sciences and Natural Resources, the UT College of Veterinary Medicine, UT AgResearch, including its system of 10 research and education centers, and UT Extension offices in every county in the state.


For more information visit and


Downy mildew on impatiens identified in Georgia retail nursery and landscape

Dr. Jean Williams-Woodward- University of Georgia Plant Pathologist
Downy mildew on impatiens identified in Georgia retail nursery and landscape
Downy mildew on impatiens (Impatiens walleriana), caused by Plasmopara obducens, has been confirmed from a commercial nursery and a home landscape sample this week. The commercial sample, submitted by the Georgia Department of Agriculture, originated from a retail nursery in the Atlanta area. The home landscape sample is interesting in that new impatiens plants were not transplanted into the landscape bed this year and that the impatiens are allowed to reseed each year. This could mean that the pathogen has survived within the landscape bed from infected plants in previous years. It is not known whether impatiens downy mildew can survive within seed. This bed is located in a shady area and is irrigated with spray emitters that wets the foliage regularly, which creates an ideal condition to spread the disease to adjacent plants. Furthermore, the cooler, wet weather that northern Georgia has seen over the past few weeks has likely contributed to disease development and spread. At this time, we don’t know how widespread impatiens downy mildew is within the state. It is also likely that hotter and drier weather patterns usually seen through the summer will stop or slow disease development.
Downy mildew symptoms on infected plants begins with leaf stippling, downward curling of leaves, leaf yellowing, and leaf drop and disintegration leaving the stems bare. The downy mildew pathogen sporulates profusely on the backside of the leaf, as well as from infected stems as they soften and collapse. If you suspect downy mildew on impatiens within Georgia, please submit a sample to confirm its presence to the UGA Department of Plant Pathology Plant Disease Clinic in Athens. The form and address can be found here: For more information, contact Jean Williams-Woodward at

Proper Use and Handling of Glyphosate in Plant Nurseries

A NEW publication by Shawn T. Steed and Robert H. Stamps at The University of Florida/IFAS


Glyphosate is the largest-selling single crop protection chemical worldwide (Woodburn 2000) and the most used herbicide in the nursery industry in the United States (Norcini et al. 1996). It is used for postemergent control of vegetation. Glyphosate is an extremely effective chemical that controls a broad spectrum of annual and perennial grasses, broadleaves, and sedges. This herbicide acts as an inhibitor of an enzyme that leads to the formation of several essential amino acids required for normal protein synthesis. Glyphosate has the ability to spread throughout the plant and concentrate in the growing regions where these amino acids are most needed for new growth. As a nonselective, translocating herbicide, it is easy to cause unintended damage to desirable vegetation if this product is used incorrectly. This publication outlines the proper use of glyphosate for plant producers and their employees.

Read the whole publication here:

Free IPM webinar: Thursday, June 7th 2012 at 11 am EDT ” Bacterial spots and blights on ornamental plants “

” Bacterial spots and blights on ornamental plants ”  will be presented by
Dr. Jean Williams-Woodward Warmer temperatures tends to increase bacterial
diseases on plants. Leaf spots, blights, and wilts are becoming more common
within nurseries and greenhouses. This webinar will cover what to look for
to identify and manage bacterial plant diseases.

Here’s how to participate in the webinar:

Before the webinar, click on the link below.

You will be able to enter the session starting at 10 am EDT on the day it
occurs (for trouble shooting if necessary), but the actual webinar will not
start until 11 am EDT.

All that you need is an up-to-date browser and internet connection (and no
firewalls!). We will run the webinar off of NC State’s ELLUMINATE site
license, so you don’t need a copy of the program yourself. In order to make
test that your system requirements are acceptable, visit the Configuration
Room linked on

In addition, Elluminate tips can be found at the link below.

Wax scale eggs hatching

Indian wax scale Ceroplastes ceriferus is a common scale on landscape plants.  In particular we find it on hollies, cherry laurel, spirea, boxwood, and barberry.  Indian wax scale is a soft scale that, as the name suggests, looks like white, gray, or pinkish wax on the branches of infested plants.  Indian wax scale secrete a lot of honey dew as do most soft scales. This can create sooty mold and reduce the aesthetic appeal of landscape plants. Heavy infestations will reduce plant vitality.  Indian wax scale has one generation per year.  They overwinter as mostly as adults but we have found younger stages in the fall and spring that apparently overwintered.  In spring crawlers emerge and crawl around to find a new feeding site.  Crawlers are the best stage to target for control of any scale and for wax scale the time is now.  Crawlers are emerging from eggs under the heavy wax covers on campus right now.  At this stage crawlers can be killed very easily as they are small and unprotected.  Thus horticultural oil is a very viable option.  Systemic products such as neonicotinoids make the plant toxic so crawlers and later stages will be killed as they feed.  More information can be found at: or

IPM Webinar Archives Online

The National IPM Webinar series is coordinated by Kelly Ivors and Steve Frank in the departments of Plant Pathology and Entomology at North Carolina State University. The webinar series is designed to provide timely information to the green industry through monthly seminars on the production and maintenance of ornamental plants.  We recently put together a new website for the series.

Webinars are typically scheduled for the first Thursday of each month starting at 11 am EST.  Announcements are sent out via a listserve.  You can sign up for the list serve by going to To participate in a webinar click on the link sent out via the list serve.

If you have missed our recent webinars on Box Blight, Ambrosia beetles, Downy Mildew, or Japanese maple scale check out our new IPM Webinar Archives page.

Restrictions on importation of Phytophthora ramorum (P. ramorum) host plants for planting into the United States

APHIS is issuing a Federal Order to restrict importation of plants for planting known to be hosts of P. ramorum. Since 2003, APHIS has been working toward limiting the spread of P. ramorum within the United States. APHIS has also been requiring that plants from several European countries and the United Kingdom be accompanied by certification of inspection and testing to be free of P. ramorum; however, the certification does not provide details about the country’s pest exclusion plan. Also, APHIS has not been requiring certification from other countries about testing or their disease-free status. The genotypic diversity and expanding host range of P. ramorum is of increasing concern.
Therefore, APHIS is requiring specific countries to have in place an annual pest exclusion program that incorporates monitoring, sampling, testing and a validation process to verify the absence of P. ramorum in a place of production. APHIS will approve the country to export host material to the United States if the program is comparable to APHIS’ restrictions for interstate movement of P. ramorum hosts. The shipments must also be accompanied by a phytosanitary certificate with an additional declaration about the place of production. Plants for planting of P. ramorum host commodities from other countries will be allowed into the United States if accompanied by a phytosanitary certificate with an additional declaration stating that P. ramorum is not known to exist within the country.
The restrictions apply to host plants for planting and all plant parts intended for propagation except seed of the plant taxa. The current APHIS-regulated P. ramorum host plant list is available at:
For questions on this Federal Oder, contact:

William Aley, Sr. Import Specialist, APHIS Plant Protection and Quarantine, Riverdale, MD at (301) 851-2130 or

See the entire document here:

NOTE: This amends a previous federal order and its largest change is “APHIS is requiring specific countries to have in place an annual pest exclusion program that incorporates monitoring, sampling, testing and a validation process to verify the absence of P. ramorum in a place of production.” Previously, no such testing was required.

Bugwood Apps. – Lots of Information in Your Hand

Six free apps including:


IveGot1 – Identify and Report Invasive Animals and Plants in Florida

Invasive Plants in Southern Forests

Invasive Plants in Southern Forests: Identification and Management

Missouri River Watershed Coalition

Missouri River Watershed Coalition – Early Detection and Distribution Mapping System

Outsmart Invasive Species

Outsmart Invasive Species

Mid-Atlantic Early Detection Network

Mid-Atlantic Early Detection Network

Invasive Plant Control, Inc.