Skip to Content

Redheaded pine sawfly


The redheaded pine sawfly, Neodiprion lecontei, is a pest of pines in ornamental landscapes, nurseries, and plantations. Adults emerge in spring and a second generation occurs in mid summer.  Eggs are laid on many 2 and 3 needled pine species such as Jack pine, loblolly pine, and red pine.  Sawflies are not flies and the larvae do not turn into butterflies. They are non-stinging herbivorous wasps.  They can defoliate trees and bushes in the landscape. Since they are gregarious it is sometimes possible to prune off an infested branch and remove all the larvae.  Management for sawflies is similar as for caterpillars though not all the insecticides will work so check the label.  Horticultural oil is a good bet especially for small larvae. Formulations that contain azadirachtin or spinosad are also effective.  For sawflies and caterpillars, management of full grown caterpillars is generally not warranted;  the damage is already done and they are hard to kill.

For pictures of redheaded pine sawfly larvae and more information visit:


UT Extension Hosts Landscape Review

JACKSON, Tenn. – For landscapers, growers or retailers who wish to stay current on best management practices for turf and landscape, UT Extension is hosting a field day for you.

The 2012 Landscape Review will take place on Tuesday, September 11, at the West Tennessee AgResearch and Education Center in Jackson, Tennessee. The Landscape Review will feature walking tours of the UT Gardens Jackson, an overview of plant trials used to evaluate better plants for Tennessee landscapes and updates on current pest, disease and weed control methods. A complete breakdown of the sessions is as follows:

9 a.m. – Using Turfgrass Weeds, Insects and Diseases as Indicators
10 a.m. – Walking Tour I: Tough Pest Resistant Plants
11 a.m. – Update on Ornamental Plant Disease and Recommended Control
Noon – Lunch (on your own)
1:15 p.m. – Walking Tour II: Tough Pest Resistant Plants
2:15 p.m. – Update on Ornamental Plant Pests and Recommended Control

This program will provide five pesticide recertification points in C3, C10 and C12. Points will be awarded at each session.

Admission is $10. For more information, including directions to the West Tennessee AgResearch and Education Center, go to

While Landscape Review is designed to be an information field day for those in the horticulture industry, interested gardeners are also welcome to attend.

UT Extension operates in each of Tennessee’s 95 counties as the off-campus division of the UT Institute of Agriculture. An educational and outreach organization funded by federal, state and local governments, UT Extension, in cooperation with Tennessee State University, brings research-based information about agriculture, family and consumer sciences, and resource development to the people of Tennessee where they live and work.


Susie Nicholson, UT Extension, 731-425-4717,
Ginger Rowsey, UTIA Marketing and Communication Services, 731-425-4768,

Leaf Spots in the Landscape

Elizabeth Little/Extension Specialist

Department of Plant Pathology, University of Georgia


Many areas in Georgia are experiencing warm, humid weather with frequent

thunderstorms this month. This is the perfect weather for fungal leaf spot

development in the landscape. Most leaf spots are benign and will not damage

the plant. Cercospora Leaf Spot of Hydrangea is an example of a leaf spot

disease that commonly occurs during prolonged wet weather or under sprinkler

irrigation. As with most leaf spots in the landscape, chemical treatment is rarely

needed. Some leaf spotting and leaf drop will not the harm the plant.

Management of leaf spot diseases involves removing sources of the disease and

protecting the plant. Start by selecting plants that will thrive where they are sited.

The fungi that cause these diseases mainly survive on the infected leaves that

fall to the ground, so removing and destroying diseased leaves can help lessen

the amount of disease next year. Stressed plants are more susceptible to

disease, so check the cultural conditions and optimize them with fertility

management and mulching. Good air circulation around plants will lower the

humidly and leaf wetness and reduce disease. Avoid wetting the leaves when

irrigating landscape plants.

If the plant is repeatedly defoliated each year or appears to be dying back

because of the disease, prune out the affected stems and use fungicides

preventatively (before the symptoms) to protect new growth.


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

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


Detection of Gladiolus Rust (Uromyces transversalis) in Manatee County, Florida

On May 11, 2012, the Florida Department of Agriculture and Consumer Services Division of Plant Industry (DPI) notified the Animal and Plant Health Inspection Service (APHIS) of the detection and confirmation of gladiolus rust (GR) on gladiolus plants located on a commercial farm in Manatee County, Florida.  GR infestations were previously detected at the same farm in 2006, and again in 2010 and 2011.  Since then, APHIS and Florida DPI have been working together to mitigate GR infestations at this farm.
In response to the current detection, APHIS issued an Emergency Action Notification on May 14, establishing requirements for interstate movement of gladiolus stems from the GR-positive farm.  Specifically, all leaf material must be removed from the stems and the stems must be completely immersed in a fungicide solution following the manufacturer’s recommended concentration and duration of treatment.  In addition, APHIS must inspect and certify that all stems are free of GR prior to interstate movement.  A list of customers purchasing gladiolus from this farm was acquired and forwarded to stakeholders so they can assess the risk and need for follow-up.  These actions are necessary to mitigate the spread of GR to other areas of the United States and into Canada.
For the United States, GR is a quarantine pest that infects members of the plant family, Iridaceae, including potted/cut-flower varieties of Gladiolus spp., Tritonia spp.Crocosmia spp., and Watsonia spp.  This rust is indigenous to eastern and southern Africa and has been reported in Morocco, southern Europe, Martinique, Australia, New Zealand, Brazil, Argentina, Costa Rica, and Mexico.  GR can cause severe losses of commercial host crops in all but the coldest and hottest areas of climate zones 7-12, if best management practices are not used.
For additional information regarding this program, you may contact Lynn Evans-Goldner, APHIS National Program Manager, at (301) 851-2286, or Robert Balaam, APHIS Regional Program Manager, at (305) 278-4872.

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

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.

Be on the lookout for Emerald Ash Borer

Emerald ash borer has not yet been found in North Carolina. However, it is found in Tennessee and Virginia so it is just a matter of time before it arrives here or in your home state.  The reason I bring it up now is that it is peak adult activity (based on degree day estimates) so they may be more noticeable now than other times of year.  Adults will be emerging from D-shaped holes in ash trees. If you notice ash trees that seem to be in decline look for these exit holes and frass around the base of the tree.  Early detection of emerald ash borer is critical in trying to reduce the economic impact and protect trees.  The most comprehensive and up-to-date information on emerald ash borer can be found at


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.