Harvest And Postharvest Techniques To Prevent Bacterial Soft Rot

Bacterial Soft Rot

Producing a healthy crop obviously is of the utmost importance to vegetable growers, and among the key factors necessary to get quality produce to market is the care taken from harvest to packing.

One problem experienced by growers of tomatoes, potatoes, and others is the postharvest attack of the bacterium Erwinia sp., known otherwise as bacterial soft rot. Soft rot can become a serious issue, particularly when care is not taken to prevent bruising, etc. during harvest and proper postharvest food safety practices are not adhered to in packing areas.
In addition to proper postharvest handling, having the adequate levels of nutrients in the plants while they are growing in the field — especially calcium — is important for reducing the effects of this bacteria. It is reported that in warm, humid climates, bacteria can affect the inside of stems and the epidermis.

One of the first crops attacked by bacterial soft rot is tomatoes. Four species of bacteria are known to cause infection. In addition to tomatoes, the bacterium has been reported on other crops as well, such as potatoes, peppers, carrot, lettuce, cabbage, and onion.

Soft Rot Symptoms

Many symptoms will help growers identify soft rot in their fields. Specifically, infected fruit show soft, odiferous lesions. The spots are small, sunken areas that are watery in appearance. These injuries range from a light to slightly darker color and are related to the natural openings or wounds in the fruit. There may be a characteristic discharge coming from the wound that is made up of millions of bacteria.

Erwinia can affect roots and stems, causing darkening of the tissues. The bacteria in potatoes is called blackleg, and can cause plant death.

Survival Of The Pathogens

What makes soft rot critical to control is that bacteria can survive on vegetables in various parts of the plants and also has the ability to live in low populations in the soil and water.

It is important to note that this strain cannot penetrate the plant; it
can only enter through a previously sustained wound or natural opening in the tissues. During handling, if bruises and wounds occur, and if the water is not disinfected well, the pathogens can enter the fruit.

In potatoes, the main source of inoculum is from the seed tuber, machinery that has been in the field, and irrigation water. The bacteria is active when conditions are favorable for pathogen growth and development — excess moisture, poor aeration, damaged tissues, and a high presence of inoculum.

Leave a Reply

2 comments on “Harvest And Postharvest Techniques To Prevent Bacterial Soft Rot

  1. No company has a single “silver bullet” to eliminate plant and human health pathogens on fruits and vegetables; however, growers and packers armed with a “silver clip” can successfully control pathogens and produce a quality product. Years ago this process was call the Hurdle Approach. I am pleased to find in this article the mention of potential cross contamination from irrigation water and farming equipment. One of the first hurdles to be considered prior to planting is treating the soil to control soil pathogens. A second hurdle is to treat irrigation water. The third hurdle should be to clean and sanitize filed equipment and transportation vehicles to prevent cross contamination from field to field and field to packing house. Once produce enters the packing house there are a number of antimicrobial hurdles to consider. For example, hydro coolers, wash tanks, spray bars and fogging units can be antimicrobial hurdles. A final hurdle that grower and packers cannot control is the consumer washing the produce prior to use. Field to fork hurdles are necessary to assure high quality and safe vegetables. Russell

Featured Stories
UC Cooperative Extension Viticulture Advisor Lindsay Jordan installs a solar “Paso Panel.” (Photo Credit: Matthew Fidelibus)
Grapes
August 27, 2016
Managing Water In California Vineyards
National viticulture symposium provides insights into estimating vineyard irrigation requirements. Read More
A Concord model grape vineyard with a two-tier cordon system. (Photo credit: Tom Zabadel)
Grapes
August 26, 2016
Model Vineyard Looks To Maximize Concord Production
Watching Michigan ‘‘Concord’’ grape growers struggle with stagnant and sometimes declining prices, a team of researchers at Michigan State University Read More
Organic potato grower staring at his crops
Crop Protection
August 25, 2016
Better Biocontrol Options Becoming Available To Organic Growers
New bio-based solutions to effectively control weeds and pests are cropping up. Read More
Marty McKenna and Mark Wheeler grab a photo together at the Florida Citrus Industry Annual Conference
Citrus Achievement Award
August 25, 2016
Working Together For A Common Cause Key To Citrus Success
Cirus Achievement Award winner Marty McKenna says the industry is sustained by strength in numbers. Read More
New citrus grove in Florida
Citrus
August 24, 2016
Florida Citrus Granted New Incentive To Grow On
A state-backed $5.5 million grove renovation/re-establishment program is now available and accepting applications. Read More
Judi Whitson, 2016 Florida Woman of the Year in Agriculture
Citrus
August 24, 2016
Meet Florida’s 2016 Woman Of The Year In Agriculture
Dedication to fostering the state’s farming future defines the latest winner of longtime honor. Read More
University of New Hampshire scientists constructed a linkage map of the seven chromosomes of the diploid Fragaria iinumae, which allows them to fill in a piece of the genetic puzzle about the eight sets of chromosomes of the cultivated strawberry.
Berries
August 24, 2016
Researchers Unravel Genetic Ancestry Of Cultivated Strawberry
A genetic analysis conducted by New Hampshire Agricultural Experiment Station researchers aims to improve modern cultivation efforts of strawberry growers. Read More
Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Center working in the Department of Entomology at the University of Wisconsin-Madison, is the recipient of NPC's 2016-2017 Academic Scholarship.
Potatoes
August 24, 2016
Fifth-Year Doctoral Student Receives NPC’s Scholarship For Potato Research
The National Potato Council (NPC) has announced that Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Read More
2011 WA IFTA Tour
Fruits
August 24, 2016
Don’t Underestimate The Value Of Production Bus Tours For Your Business [Opinion]
Sure, you can see and talk with virtually anyone in the world through your smart phone, but you can’t shake their hand. Read More
Crowd protesting GMOs stock image FEATURE
Farm Management
August 24, 2016
Swaying Views On GMO Foods No Easy Task
Featured speaker for the upcoming FFVA Annual Convention says tides are slowly turning in how people digest the concept of genetic modification. Read More
The Latest
Grapes
August 27, 2016
Managing Water In California Vineyards
National viticulture symposium provides insights into estimating vineyard irrigation requirements. Read More
Grapes
August 26, 2016
Model Vineyard Looks To Maximize Concord…
Watching Michigan ‘‘Concord’’ grape growers struggle with stagnant and sometimes declining prices, a team of researchers at Michigan State University Read More
Crop Protection
August 25, 2016
Better Biocontrol Options Becoming Avail…
New bio-based solutions to effectively control weeds and pests are cropping up. Read More
Citrus Achievement Award
August 25, 2016
Working Together For A Common Cause Key …
Cirus Achievement Award winner Marty McKenna says the industry is sustained by strength in numbers. Read More
Citrus
August 24, 2016
Florida Citrus Granted New Incentive To …
A state-backed $5.5 million grove renovation/re-establishment program is now available and accepting applications. Read More
Citrus
August 24, 2016
Meet Florida’s 2016 Woman Of The Year In…
Dedication to fostering the state’s farming future defines the latest winner of longtime honor. Read More
Berries
August 24, 2016
Researchers Unravel Genetic Ancestry Of …
A genetic analysis conducted by New Hampshire Agricultural Experiment Station researchers aims to improve modern cultivation efforts of strawberry growers. Read More
Potatoes
August 24, 2016
Fifth-Year Doctoral Student Receives NPC…
The National Potato Council (NPC) has announced that Justin Clements, a fifth-year doctoral student in the Molecular and Environmental Toxicology Read More
Fruits
August 24, 2016
Don’t Underestimate The Value Of P…
Sure, you can see and talk with virtually anyone in the world through your smart phone, but you can’t shake their hand. Read More
Farm Management
August 24, 2016
Swaying Views On GMO Foods No Easy Task
Featured speaker for the upcoming FFVA Annual Convention says tides are slowly turning in how people digest the concept of genetic modification. Read More
Grapes
August 23, 2016
Deeper Irrigation Method Showing Promise…
A new subsurface irrigation system is showing promise for slashing water usage in vineyards. Many vineyards use drip lines that Read More
Disease Control
August 23, 2016
Florida Sweet Corn Has New Deadly Stalke…
Learn how to identify, the survival and spread, as well as management methods for this disease. Read More
Fruits
August 23, 2016
New Insecticides Geared To Give Growers …
Check out three unique chemistries from several of the industry's leading crop protection suppliers. Read More
Apple Grower of the Year
August 22, 2016
Apple Crop Forecasts Live On Twitter
You'll be able to get up-to-the-minute reports of not only the various regions of the U.S., but key production regions around the world. Read More
Oranges
August 22, 2016
Major OJ Purchase Promises Relief For Fl…
$30 million planned acquisition from USDA to be used for surplus removal. Read More
Varieties & Rootstocks
August 22, 2016
Florida Citrus Breeders Squeezed For Tim…
The pressure is on to develop a more HLB-tolerant orange. Read More
Pest Control
August 21, 2016
Spotted Wing Drosophila: For Michigan, …
Why the pest can be so much more destructive for Eastern cherry growers might be due to what they’re not farming. Read More
Grapes
August 19, 2016
European Grapevine Moth Eradicated From …
Agricultural officials confirm eradication of invasive pest, lift quarantine restrictions. Read More
[gravityform id="62" title="false" description="false"]