Managing Botrytis And Sclerotinia White Mold In High Tunnel And Greenhouse Tomatoes

Both Botrytis grey mold and Sclerotinia white mold can cause serious problems in high tunnel tomatoes. They are favored by cool temperatures and high relative humidity. Even if you have warm days, cool nights can encourage development of these diseases.

Botrytis ghost spot of tomato. Photo by Sally Miller.
Botrytis ghost spot of tomato. Photo by Sally Miller.

Botrytis causes several types of symptoms on tomatoes, including blighting of leaves and stems and other green tissue, and soft rot and ghost spots on fruit. The ghost spots appear when Botrytis infects the fruit but the disease does not progress. Sclerotinia white mold often attacks tomatoes at the base of the stem in high tunnels, killing the tissues and causing the plants to wilt and die. Eventually hard black, round-irregularly shaped Sclerotia can be observed inside or outside the stem.

Several fungicides are available for use against fungal diseases in high tunnels and greenhouses. According to the Ohio Department of Agriculture, regulations pertaining to greenhouses also apply to high tunnels. The directions for use on the pesticide labels must be followed. Restricted-use pesticides can only be used by Certified Pesticide Applicators with the greenhouse certification on their applicator license. Restricted-use pesticides are identified prominently on the label.

Pesticides that are not restricted-use and are labeled for tomatoes but without specific greenhouse use directions may be used unless greenhouse use is expressly prohibited on the label. Thus, a specific label for greenhouse use is not required; but the label must be read carefully to be certain the greenhouse use is not restricted.

Botrytis grey mold of tomato. Photo by Sally Miller.
Botrytis grey mold of tomato. Photo by Sally Miller.

For more information about fungicide usage allowances in high tunnels and greenhouses, please contact the Ohio Department of Agriculture. Information on insecticide and fungicide labeling for greenhouse use is included in the Midwest Vegetable Production Guide for Commercial Growers.

Scala (Bayer CropScience) and Fontelis (DuPont) are labeled for Botrytis and white mold management in greenhouse tomatoes. For other diseases, certain copper products, Tanos (DuPont), and Manzate (Dupont), Dithane (Dow), and other Ethylenebisdithiocarbamates  (EBDC) fungicides may be used in greenhouse or high tunnel tomatoes. The fungicides Curzate (DuPont), Gavel (Gowan), Previcur Flex (Bayer CropScience) and Ranman (FMC) may be used for late blight management. Some fungicides commonly used in open field tomato production, such as Bravo Weather Stik (Syngenta), Quadris (Syngenta), Cabrio (BASF) and Endura (BASF), are not allowed in greenhouse or high tunnel systems.

Source: By Sally Miller, Department of Plant Pathology, OSU, OARDC, OSU Vegnet news release

Topics: , ,

Leave a Reply

Tomatoes Stories

TomatoesGenetic Toolkit To Increase Tomato Yields
November 5, 2014
An array of gene variants provides breakthrough benefits in tomato yield for breeders; other crops to follow. Read More
TomatoesCalifornia Processing Tomato Growers Produce A Record Crop
November 5, 2014
Despite persistent drought conditions, an estimated 14 million tons were harvested in California this year. Read More
Disease ControlNew Mechanism Developed To Prevent Tomato Wilting
November 3, 2014
The mechanism aids in the resistance and susceptibility of a fungus associated with wilt. Read More
Insect ControlTake Control Of Thrips In Your Greenhouse
October 30, 2014
Why such a foreboding title? Thrips, one of the tiniest pests of greenhouse crops, are the carrier of one of Read More
MarketingTomato Survey Tracks Consumer Trends
October 23, 2014
Results indicate how labeling matters in purchasing decisions. Read More
More Vegetables6 Savory Tomato And Pepper Varieties For Florida Growers
October 20, 2014
Leading vegetable seed companies highlight a half dozen high-performance selections for producers in the Sunshine State. Read More
TomatoesSeminis Introduces Dixie Red Fresh Tomato Variety
October 7, 2014
New variety features larger fruit, better disease package, and higher yield potential compared to Florida 47 R tomato hybrid. Read More

The Latest

CucurbitsNew Product Takes Aim At Nematodes
December 19, 2014
NIMITZ receives EPA and Florida registrations. Read More
LaborLipman CEO Pens Letter In Response To Tomato Debate
December 2, 2014
Correspondence addresses actress Eva Longoria’s documentary “Food Chains,” which focuses on mistreatment of tomato farmworkers. Read More
TomatoesThree New Tomato Breeding Lines Approved For Release
November 6, 2014
UF/IFAS scientists see promise in disease resistance and overall quality. Read More
TomatoesGenetic Toolkit To Increase Tomato Yields
November 5, 2014
An array of gene variants provides breakthrough benefits in tomato yield for breeders; other crops to follow. Read More
TomatoesCalifornia Processing Tomato Growers Produce A Record C…
November 5, 2014
Despite persistent drought conditions, an estimated 14 million tons were harvested in California this year. Read More
Disease ControlNew Mechanism Developed To Prevent Tomato Wilting
November 3, 2014
The mechanism aids in the resistance and susceptibility of a fungus associated with wilt. Read More
Insect ControlTake Control Of Thrips In Your Greenhouse
October 30, 2014
Why such a foreboding title? Thrips, one of the tiniest pests of greenhouse crops, are the carrier of one of Read More
MarketingTomato Survey Tracks Consumer Trends
October 23, 2014
Results indicate how labeling matters in purchasing decisions. Read More
More Vegetables6 Savory Tomato And Pepper Varieties For Florida Grower…
October 20, 2014
Leading vegetable seed companies highlight a half dozen high-performance selections for producers in the Sunshine State. Read More
TomatoesSeminis Introduces Dixie Red Fresh Tomato Variety
October 7, 2014
New variety features larger fruit, better disease package, and higher yield potential compared to Florida 47 R tomato hybrid. Read More
TomatoesTop 100 Vegetable Grower Jon Esformes Is A Champion For…
October 6, 2014
Labor has been at the top of many growers’ minds — for better or for worse — in recent years. Read More
BerriesReal Estate Firm, Wish Farms Strike Large Land Deal
October 1, 2014
$13.8 million transaction includes more than 800 acres acquired from longtime Central Florida produce operation. Read More
OrganicResearchers Breeding Organic Tomato Varieties Receive $…
October 1, 2014
Purdue University accepts funding to lead multi-institution research to breed organic varieties that will resist foliar diseases. Read More
TomatoesDrought Update For Fresh And Processed Tomatoes
September 8, 2014
The 2014 production numbers are expected to be the highest on record; however, growers are facing a few challenges from the drought that have some shifting acreage to areas with more water. Read More
Disease ControlBeet Curly Top Virus Is An Unpredictable Disease
September 5, 2014
Researchers are trying to determine the conditions that favored the ‘perfect storm’ for beet curly top virus, which caused $100 million in losses last year. Read More
TomatoesProduction Reaches An All-Time High For Processing Toma…
August 29, 2014
A record high is predicted for the 2014 processing tomato crop. Read More
TomatoesScientists Develop Tomato Plant That Can Tolerate 24 Ho…
August 12, 2014
Researchers discover a gene that could allow commercial tomatoes to tolerate light all day and night. Read More
TomatoesTomatoes: The Most Versatile Of All The Vegetables? [Op…
July 28, 2014
Tomatoes offer a variety of culinary options for consumers--from pizza to ice cream, the choices are many. Read More