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Archive for the ‘Pest Alert’ Category

Plant Disease Clinic Report for February 2013

March 11th, 2013 by

By Ansuya Jogi and Jean Williams‐Woodward

The tables in the link below consist of the commercial and homeowner samples submitted to the plant disease clinics in Athens and Tifton for February 2013 (Table 1) and one year ago in March 2012 (Table 2). Sample numbers were still low in February, but this will soon change! Much of the symptoms we saw on samples were due to environmental stress/injury. However, root and crown diseases caused by Phytophthora, Thielaviopsis basicola, and Rhizoctonia continue to be identified. Also, with the cooler, humid, wet weather, the fungus, Botrytis, will continue to cause problems in the field and in greenhouses, particularly on freeze damaged tissues. Looking ahead through March, based upon samples diagnosed a year ago, we will likely see an increase in turf samples and problems, as well as rust and Sclerotinia diseases starting to show up. I would suspect too that downy mildew diseases will also become prevalent on some crops, particularly on ornamentals in nurseries.


Evaluation of fungicides for the prevention of boxwood blight, 2012.

January 8th, 2013 by

K. L. Ivors, L. W. Lacey, and M. Ganci

Dept. Plant Pathology, North Carolina State Univ.

455 Research Drive, Mills River, NC 28759

This trial evaluated the efficacy of several commercially available fungicides for preventive activity against boxwood blight caused by Cylindrocladium buxicola. Treatments were arranged in a randomized complete block design consisting of four replications of six 1-gal English boxwood plants per treatment on a container pad at the Mountain Horticultural Crops Research Station in Mills River, NC. Treatments were applied as foliar sprays until runoff with a CO2-pressurized backpack sprayer equipped with a handheld boom and a single, hollow-cone nozzle (TXVS-26) delivering 50-60 psi. Treatments were applied on 13 Sep, 28 Sep, and 13 Oct. Inoculum was prepared by flooding Petri-dishes of 10 day cultures of the pathogen growing on PDA. Plants were spray inoculated with 5,000 spores per ml until runoff one day post treatment on 14 Sep, and again on 30 Sep, two days after the second fungicide treatment with 8,000 spores per ml until run-off. Disease assessments were conducted on 1, 16 and 26 Oct. Percent leaf area diseased was recorded using the standard Horsfall-Barratt scale. Disease pressure was not high enough to evaluate percent leaf drop or percent stem streaking. AUDPC for percent leaf area diseased across the entire timeframe of the trial was calculated. Air temperatures during the trial was suboptimal for high rates of infection with average daily high and low temperatures of 77.7 and 55.4°F for Sept; and 66.3 and 43.5°F for Oct.

For the entire article – click here.

Regulatory Plant Issues for Nurseries

November 19th, 2012 by

Regulatory Plant Issues: What You Must Do to Sell, Import or Export Live Plants from the State of Kansas
Jeff Vogel, Kansas Department of Agriculture

How do you stay up to date with plant quarantines, emerging pest threats and noxious weed lists? It can be very difficult to keep track of importing/exporting issues as well as other live plant sales concerns. Learn the most important aspects of regulatory plant issues from the state perspective.


Jeff is the Program Manager for the Plant Protection and Weed Control Program for the Kansas Department of Agriculture. His office works to ensure the health of the state’s native and cultivated plants by excluding or controlling destructive pests, diseases and weeds. His staff examines and analyzes pest conditions in crop fields, rangelands, greenhouses and nurseries.

“Bringing Nature Home”, sponsored by the Georgia Exotic Pest Plant Council

October 10th, 2012 by

Do you care about protecting our native plant habitats from invasive plants? How can you tell which plants are invasive? Do you want to know how you can help? First step is to come to the Georgia Exotic Pest Plant Council Annual Conference on November 8th.

The GA-EPPC, Georgia Exotic Pest Plant Council, is having its Annual Meeting and Conference on Thursday, November 8th, 2012, from 9am to 4pm. The conference will be held at Stuckey Conference Center, UGA 1109 Experiment Street Griffin, Georgia.

GA-EPPC’s goals are to focus attention on the adverse effects invasive plants have on the diversity of Georgia’s native plants and animals; the use of invasive plant management to prevent habitat loss; the socioeconomic impacts of these plants; changes in the seriousness of the different invasive plants over time and the need to exchange information to help land owners and managers set priorities for invasive plant management.

For more information please visit http://www.gaeppc.org/

Redheaded pine sawfly

September 11th, 2012 by


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: http://ecoipm.com/


UT Extension Hosts Landscape Review

August 24th, 2012 by
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, snichol@utk.edu
Ginger Rowsey, UTIA Marketing and Communication Services, 731-425-4768, gtrice@tennessee.edu

Leaf Spots in the Landscape

August 5th, 2012 by

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

July 18th, 2012 by

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

July 10th, 2012 by

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 ipmproapp.com and ipmliteapp.com


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 http://www.ipmproapp.com and ipmliteapp.com.


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

June 19th, 2012 by
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.