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...
Pythium

March 27, 2017

Florida Ornamental Growers Took a Hit in 2016 Thanks to Wet Weather

While damage figures from the 2015-2016 winter rains are still being compiled, researchers have found that Phytophthora and Pythium caused severe destruction in many plants.

Read More

March 20, 2017

AgBiome’s New Zio Biofungicide Receives EPA Registration

The new biofungicide is the first product from AgBiome, and will be marketed by SePRO Corp. in the ornamentals market.

Read More
Oat Grass Banker System feature

March 20, 2017

How You Can Market the Benefits of Biocontrols

Educating retailers and end consumers about the use of biocontrols and why it’s important has helped Fessler Nursery gain new customers and profits.

Read More
Latest Stories

March 20, 2017

AgBiome’s New Zio Biofungicide Receives EPA Regis…

The new biofungicide is the first product from AgBiome, and will be marketed by SePRO Corp. in the ornamentals market.

Read More
Oat Grass Banker System feature

March 20, 2017

How You Can Market the Benefits of Biocontrols

Educating retailers and end consumers about the use of biocontrols and why it’s important has helped Fessler Nursery gain new customers and profits.

Read More

March 20, 2017

Neonic Insect Control Alternative Offers Favorable Prof…

Altus, a butenolide class insecticide with the active ingredient flupyradifurone, will be available beginning May 1, and is labeled for greenhouse and nursery use on ornamental plants, vegetable transplants, and indoor vegetable production.

Read More

February 28, 2017

OHP Launches New Ovicide/Miticide, Announces Partnershi…

Applause is a new miticide that targets eggs and immature stages of several mite species. Through the Vestaron partnership, OHP will market Spear-O, a toxin-derived bioinsecticide.

Read More

February 26, 2017

AgBiome Will Enter the Ornamentals Market With a New Bi…

AgBiome, a young company with teammates steeped in decades of experience in the crop protection world, sees an opportunity to bring products to market that fill the existing gaps in plant protection. The company has partnered with SePRO to market and distribute Zio, a biological fungicide expecting EPA registration this spring.

Read More
Tomato Spotted Wilt Virus on Osteospormum

February 23, 2017

4 Pathogens to Prepare For in 2017

Early detection of disease and virus symptoms in the greenhouse is critical. One expert says there are a few pathogens in particular that growers should be monitoring.

Read More
Boxwood Blight

February 7, 2017

Boxwood Blight Detection in Illinois Has Growers on Ale…

Symptoms of boxwood blight, which can spread quickly in production facilities, include leaf spots, stem cankers, and defoliation.

Read More
Adult Thrips feature

January 25, 2017

Tips to Stay Ahead of Aphids, Mites, and Thrips

Control these persistent pests with innovative chemistries that will expand your rotation options with new modes of action.

Read More

January 24, 2017

AmericanHort Issues Call to Action on Safeguarding Pyre…

Synthetic pyrethroids, a class of insecticides for nursery and floriculture production and landscape management, are undergoing an EPA registration review with a focus on certain potential environmental effects.

Read More
Effective pest control

January 12, 2017

Prevention and Early Intervention: The Keys to Biocont…

Advance preparation and starting out right helps you implement an effective biocontrol program that reduces pest pressure.

Read More
downy-mildew-impatiens-feature

December 24, 2016

How Agronomic Programs Can Help You Successfully Manage…

To prevent problems before they start, make an agronomic program an essential part of your production plan.

Read More
Various Wood Substrates

December 18, 2016

The Evolution And Revolution Of Wood Substrates

Growing media formulations are evolving as researchers fine tune blending techniques for wood component substrate alternatives to achieve reliable, consistent results.

Read More
foxglove-aphid

November 29, 2016

How Greenhouse Growers Can Manage The Foxglove Aphid

Recent research is shedding new light on the foxglove aphid. Understanding host plants, identification, and biology will help growers deal with this pest.

Read More
growth-products-catalog

November 19, 2016

Growth Products Launches New Catalog Of Horticulture Bi…

The full-color resource guide provides detailed product descriptions and rate charts for all of the company’s bioinnovations, liquid fertilizers, micronutrients, and biological control products.

Read More

November 1, 2016

Bayer Production Ornamentals Hits The Market With 17 Pr…

November 1 officially marked the launch of the Bayer Production Ornamentals business, serving professional growers in greenhouses and nurseries across the U.S. Its comprehensive portfolio of innovative product solutions and support includes product and pest management expertise and a team of technical specialists.

Read More

October 25, 2016

Why Logic May Be The Best Defense Against Q-Biotype Whi…

Greenhouse Grower Editor Laura Drotleff says while you may feel you're in a lose-lose situation with pest control, there are some solutions that can help.

Read More
eric smith Biosafe

October 13, 2016

BioSafe’s New Hort Sales Rep Says Water Regulation And …

Eric Smith, BioSafe Systems’ New Horticultural Technical Sales Representative, has several years of experience that he says will help him when working with growers on critical issues facing them.

Read More
weeds

October 8, 2016

Sign Up For The University Of Florida’s Weed Management…

Participants in the course, which starts October 24, will learn how to manage all aspects of weed management in greenhouses, including weed identification, developing herbicide programs, and the latest non-chemical methods of weed control.

Read More