Scouting And Preventative Measures For Tobacco Mosaic Virus (TMV) On Petunia

Dümmen is informing customers of a potential risk of tobacco mosaic virus (TMV) infected petunia cuttings from its Red Fox El Salvador farm for cuttings shipped in weeks 51 to 7.

“The nature and spread of this virus has led us to no longer be confident in the complete containment of this pathogen within our petunia production in El Salvador,” a letter from the company says. As a result, starting week 8, 100 percent of Dümmen petunia cutting shipments will be sourced from stock locations in either Ethiopia or Israel.

Here is the advice Dümmen shared with its customers on scouting and preventative measures for dealing with TMV on petunia if growers continue with product shipped in the time period mentioned above:

Scouting

For those of you who have received cutting shipments from us already, we [Dümmen] ask you to continue to be vigilant in your scouting. Symptoms induced by tobacco mosaic virus (TMV) are somewhat dependent on the host plant, as well as the variety. It can be expressed in a variety of different ways, including: mosaic, mottling, necrosis, stunting, leaf curling and yellowing of plant tissues. The following symptoms have been observed in petunia.

Scouting petunia for TMV

 

Testing 

Suspect symptoms should be tested to confirm potential infection and avoid misdiagnosis. Should you find suspect plant material, we are equipped at our corporate office to conduct a rapid test for pathogen presence. It is our preference that growers submit samples to the below address so we can ensure the fastest turnaround possible, however samples can also be submitted to your diagnostic lab of choice.

How To Ship Samples:

  • Do not allow specimens to dry out or get too hot.
  • Send specimens as soon as possible after collecting. Refrigerate any specimens that cannot be shipped immediately.
  • Samples that might break down quickly should be shipped by an express mail service.

Ship to Address (United States):
Dümmen North America
Attn: Dr. Kate Santos
5544 Hilliard Rome Office Park
Hilliard, Ohio 43026

Ship to Address (Canada)*:
University of Guelph
Laboratory Services
95 Stone Road West
Guelph, ON N1H 8J7
*Sample submission form is required for Canada shipments.

Minimize Transmission

By not pinching/shearing a petunia or a Confetti combination containing petunia during the propagation or finished stages, you will minimize the chance for pathogen spread.

Petunia and Confetti growth can alternatively be controlled in the following ways:

  • High light, cool growing and high fertility with low phosphorous fertilizers
  • Apply B-Nine and Florel (2500 ppm and 300 to 500 ppm respectively) about two weeks after sticking when cuttings are rooted.
  • At around three weeks after transplant, Confetti with Aloha calibrachoa (NOT Aloha Kona) respond well to a 1.0 ppm Bonzi, Paczol or Piccolo (paclobutrzol) drench
  • A late drench of 0.5 to 1.0 ppm Bonzi, Paczol or Piccolo (paclobutrzol) when plant has reached saleable size improves plant form. Use drench volumes appropriate for container size.

Transplanting

  • Step 1: Before loading plant material for transplant, scout for symptomatic plants.
  • Step 2: If a symptomatic plant is found, place a label or stake in the suspicious plant.
  • Step 3: Spray milk solution on all liners.
    • 10% non-fat dry milk solution (Wt/vol) just before uploading for transplant.
    • This spray will inactivate any surface or exposed TMV virus and prevent spread to uninfected plant material.
  • Step 4: Load all trays without markers for transplant while liners are still wet. The effectiveness of milk is lost when it dries.
  • Step 5: Discard/destroy marked trays. Follow protocol below.
  • Step 6: Contact your Dümmen representative and we will issue you a credit for the destroyed amount of cuttings.

Disposal And Disinfection

The TMV virus is only spread mechanically (by hands, clothing and plant-to-plant contact) therefore, it is important that you use caution when removing and destroying infected varieties at your facility.

  • Step 1: Isolate infected plants.
  • Step 2: Do not contact other plants in the area (particularly other petunia, calibrachoa, verbena and impatiens).
  • Step 3: Discard the infected plants and all associated plastic, tags, plant and soil into plastic garbage bags in the greenhouse, at the point where they are on the bench.
    • Have one worker hold the plastic garbage bag open for a second worker and to discard the materials into the bag.
    • Workers should wear disposable plastic gloves when placing the materials into the plastic garbage bag and the gloves should be discarded afterward.
  • Step 4: Carry sealed bags with infected plants out of the aisles and discard well outside the crop area. Do this work at the end of the working day. Those individuals carrying out this task should not work in any other area of the greenhouse for the remainder of the day.

Any greenhouse area with possible infected plants should be washed with the label rate of trisodium phosphate solution to remove any possible virus contamination. Tools that could have come into contact with infected liners or plants should be washed thoroughly with hot, soapy water containing a dish detergent. Those tools can be surface disinfected with a solution of 1 percent Virkon S, 20 percent NFDM (Nonfat dry milk) plus wetting agent, or a 1:10 bleach solution, as long as it is freshly made and not reused.

Topics: ,

Leave a Reply

More From Crop Inputs...
Aphids On Older Leaves

July 25, 2016

How You Can Stop Aphids By Understanding Their Interactions With Plants

Knowing which aphids target which crops and how aphids colonize and move on plants goes a long way toward setting up an effective management plan.

Read More
Roots with plant media background XL-W

July 2, 2016

University Of Florida Offering Online Nutrient Management Course In July

Topics include common nutrient problems, essential nutrients, fertilizer types, how to interpret a fertilizer label, managing total nutrient level, pH, and EC, onsite testing, and growing media.

Read More
Eretmocerus eremicus adult, Parasitic Wasp

July 2, 2016

Beneficial Predators Can Help Control Whiteflies On Poinsettia

Whitefly infestations are a reccuring problem that often plagues poinsettia growers. Successfully keep them in check by letting beneficial predators take the work out of pest control.

Read More
Latest Stories
Aphids On Older Leaves

July 25, 2016

How You Can Stop Aphids By Understanding Their Interact…

Knowing which aphids target which crops and how aphids colonize and move on plants goes a long way toward setting up an effective management plan.

Read More
BASF Orkestra Intrinsic

June 21, 2016

New Mode Of Action From BASF Offers Deeper Disease Cont…

When it comes to disease control, you need all the help you can get. BASF recently hosted growers, Extension personnel, and trade media to present its newest fungicide with two active ingredients, offering dual modes of action.

Read More
Nematodes-feature

June 4, 2016

New Biocontrols Provide Effective Pest Control In Green…

Biological chemistry manufacturers have introduced several new products recently that offer a range of insect and disease management options. Here’s a look at some of them.

Read More
Whitefly

June 2, 2016

Breaking News: Florida Growers Reporting Major Whitefly…

Reports have come from the Florida Keys to Palm Beach County that whitefly populations in landscapes are reaching unprecedented levels and are not responding to pesticide applications. Biotype-Q has been found in four different communities. University of Florida/Institute of Food and Agricultural Science researchers are working with USDA-APHIS, USDA-ARS, the Florida Department of Agriculture, and growers and landscape professionals to manage the developing problem.

Read More
Triathlon BA container shot

May 24, 2016

OHP’s Triathlon Biofungicide Now Listed By The Organic …

Triathlon BA is a broad-spectrum preventative biofungicide that provides control of many foliar and soilborne diseases in ornamentals and herbs.

Read More
Two-spotted spider mites, adults and eggs

May 11, 2016

SePRO Launches Summer Insecticide Management Program Fo…

The program is designed to help growers use SePRO’s insect management tools to prevent plant damage from a variety of pests.

Read More
Small Aphid Colony on Calibrachoa

May 2, 2016

How To Stop Aphids In The Greenhouse

When untreated, aphids damage ornamental crops and act as vectors for disease. Integrated Pest Management combined with vigilant scouting can help you stay ahead of the problem.

Read More
Cicada (Greg Hoover, Penn State)

April 26, 2016

Cicadas Set To Emerge In Several Eastern States This Sp…

While there’s no immediate cause for alarm, experts say the cicada’s egg-laying process can damage woody ornamentals and make them vulnerable to diseases.

Read More
Parisitic Wasp Aphidius colemani

April 25, 2016

Plant Growth Regulator Use Can Affect Biological Pest C…

The use of plant growth regulators may negatively influence the outcome of biological control programs, according to researchers at North Carolina State University.

Read More
Beneficial Insectary Orius insidiosus

April 22, 2016

Beneficial Insectary Increasing Production Of Three Bio…

The company is now producing Orius insidiosus, Dalotia coriaria, and Dicyphus hesperus at its California facility, reducing the transit time of perishable biocontrols between producer and grower.

Read More

April 21, 2016

Michigan State University Offers Tips On Greenhouse Soi…

Improper pH and higher than adequate nutrient levels are among the many reasons for regular soil testing.

Read More
Parasitized aphid mummies, ladybird beetle larvae

April 18, 2016

4 Things You Need To Know About Implementing Biological…

Biocontrols are useful alternatives to traditional pesticides that provide effective pest control in the greenhouse. Here are four ways to get started successfully.

Read More
John Wendorf Bayer Ornamentals

April 14, 2016

Bayer’s New Ornamentals Business Manager Aims To Help G…

John Wendorf, who previously managed BFG Supply’s grower division, says when Bayer launches into the ornamentals market this November, growers will have access to a wealth of resources, including a dedicated team focused on ornamentals growers.

Read More
Emerald Ash Borer

March 22, 2016

Canada Implements New Voluntary Biosecurity Standard Fo…

The voluntary standard is designed to protect the greenhouse, nursery, and floriculture industries from invasive plant pests.

Read More

March 22, 2016

EPA Approves Syngenta’s Mainspring GNL Insecticide For …

Featuring the active ingredient cyantraniliprole, Mainspring GNL provides broad-spectrum control of key pests, such as thrips, whiteflies, aphids, caterpillars, leafminers, and leaf-feeding beetles.

Read More
Black Root Rot on Vinca

March 15, 2016

How To Identify Different Root Rots In The Greenhouse

Root rots can cause similar symptoms on hosts. Here are some tips for scouting in your greenhouse.

Read More
One symptom of Botrytis blight is gray, fuzzy sporulation on foliage and flowers, similar to that shown on the flower of this hibiscus

March 11, 2016

Manage Botrytis With These Cultural And Fungicide Contr…

High relative humidity and low temperatures in the greenhouse open the way for Botrytis to develop on plants. A mix of cultural and fungicide control options will help you manage this common disease effectively.

Read More
Biocontrols and beneficials absolutely can be used in outdoor production, with the use of banker plant systems

March 8, 2016

France-Based InVivo Acquiring Bioline, Syngenta’s Bioco…

Bioline, a subsidiary of Syngenta, specializes in the production and marketing of biological control agents, and in particular macroorganisms active against insect pests in fruits, vegetables, and flowers.

Read More
[gravityform id="35" title="false" description="false"]