Eastern New York Commercial Horticulture Enrollment

Program Areas

  • Food Safety
  • Variety Evaluation
  • Market Development
  • Pest Management
  • Cultural Practices

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  • Educational Meetings & Conferences
  • In-Field Educational Opportunities
  • On-Farm Research Trials

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Stop the Rot! - Using Cultural Practices to Manage Bacterial Diseases of Onion

Christy Hoepting, Extension Vegetable Specialist
Cornell Vegetable Program

April 2, 2012

Stop the Rot! - Using Cultural Practices to Manage Bacterial Diseases of Onion
Narrow plant spacing reduced bacterial bulb decay by 53 to 64%
Do you know how easy this is? A simple modification to adjust your planting configuration is all it would take to drastically reduce losses from bacterial bulb decay. Our studies showed that when plant spacing was reduced from 6 or 8 inches to 4 inches with 3 or 4 rows per 3-foot plastic mulch bed (row spacing: 4 rows = 6 inch; 3 rows = 8 inch), this provided 53 to 64% control of bacterial bulb decay at harvest (Table 1). Marketable yield also increased by 1.4 to 2.4 times, representing an increased net economic return of $43 to $258 per 100 feet of bed, due to increased weight of marketable jumbo-sized bulbs (Table 1). We learned that wide plant spacing produces big bushy plants with more leaves, thicker necks, delayed maturity and bigger bulbs. Unfortunately, it was these bigger bulbs that rotted! By narrowing plant spacing, we got fewer colossal-sized bulbs, which we more than made up for by having significantly more healthy jumbo-sized bulbs to market (Table 1).

Alternatives to black plastic reduced bacterial bulb decay by 59 to 75%
This is also a very simple and easy modification for small-scale growers producing onions on plastic mulch to make to their cultural practices that could go a very long way towards reducing bacterial bulb decay. Our studies showed that reflective silver mulch, biodegradable black plastic and bare ground had significantly 1.8 to 2.8 times higher marketable yield than black plastic (Table 2). Reflective silver and biodegradable black plastics had significantly 3.7 and 3.6 times, respectively, higher jumbo weight than black plastic, which resulted in an increased net return of $96 to $215 per 100 feet of bed compared to black plastic (Table 2). All of the alternatives to black plastic had significantly lower soil temperatures compared to the black plastic; we suspect that the higher temperatures of the black plastic are more favorable for development of bacterial diseases.

Stop the Rot article (pdf; 1356KB)

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Upcoming Events

ENY Orchard Soil Health and Beneficial Fungi Meeting

August 15, 2024 : ENY Orchard Soil Health and Beneficial Fungi Meeting
Peru, NY

The soils that we grow our trees in play a critical role in the success of our orchard's productivity.  Mycorrhizal fungi provide many benefits to the soils, though it is still unclear to what extent inoculating our soils with commercial blends of these fungi may have on the growth of trees during orchard establishment.

Join the members of CCE ENYCHP and the Cornell Soil Health Program for a field meeting on the basics of soil health, the potential benefits of mycorrhizal fungi, and an update on the current project status of our SARE grant on orchard mycorrhizal products.

This meeting is intended for farmworkers, young and beginning orchardists, and experienced orchard managers wanting to learn about the basics of soil health and mycorrhizal fungi within the orchard.

View ENY Orchard Soil Health and Beneficial Fungi Meeting Details

North Point Community Farm Twilight Meeting

Event Offers DEC Credits

August 19, 2024 : North Point Community Farm Twilight Meeting
Plattsburgh, NY

North Point Community Farm Twilight Meeting

Monday, August 19th 4-7 pm (rain or shine)

2172 Military Turnpike, Plattsburgh, NY 12901

$10 per farm

Join us for a tour of North Point Community Farm, a diversified vegetable, berry, and flower operation in the North Country. Farmers Marisa and Mike will give us an overview of their decision-making as they expand their business, increasing their high tunnel production, investing in new tillage equipment, and transforming an old dairy barn into an efficient wash-pack shed with food safety in mind. We'll end the evening with local food refreshments and an opportunity to network with growers from NY and VT.

DEC credits: 1.5 credits in categories 1A, 10, 23

View North Point Community Farm Twilight Meeting Details

Drinkwine Produce Twilight Meeting

Event Offers DEC Credits

September 16, 2024 : Drinkwine Produce Twilight Meeting
Ticonderoga, NY

Drinkwine Produce Twilight Meeting

Monday, September 16th 4-6 pm (rain or shine)

1512 Street Rd, Ticonderoga, NY 12883

Join us for discussions on high tunnel tomato production and sweet corn and pumpkin IPM at Drinkwine Produce in Ticonderoga. Henry Drinkwine will provide an overview of his practices for maintaining high yields of tomatoes, including pollination and soil fertility management. In the second half of the meeting, CCE specialist Chuck Bornt will review integrated pest management for sweet corn and pumpkins, with hands-on scouting and identification of key pests and diseases.

DEC Credits: 1.5 credits in categories 1A, 10, 23

View Drinkwine Produce Twilight Meeting Details

Announcements

Resources from CCE ENYCHP!


This website (https://enych.cce.cornell.edu/) contains our calendar of upcoming programs and registration links. For updated programmatic information, technical resources and links to newsletters please see our program blog site: https://blogs.cornell.edu/enychp/.
We also maintain the following online resources that you can view directly from these links:

• CCE ENYCH YouTube (program videos): https://www.youtube.com/channel/UCSk_E-ZKqSClcas49Cnvxkw

• CCE ENYCH Facebook (program social media): https://www.facebook.com/CCEENYCHP/

• CCE ENYCH Instagram (program social media): https://www.instagram.com/cceenychp/?hl=en


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