Tag Archives: Research

2016 University of Guelph Cucumber Downy Mildew Results

In 2016, Cheryl Trueman compared several different cucumber downy mildew control programs in plots at the University of Guelph Ridgetown Campus. These studies indicated that the highest level of control was achieved using a three product rotation of Orondis Ultra A+B, Torrent and Zampro.

Several different product rotations were compared including:

  • Bravo-only applied 6 times.
  • a high input strategy that focused on optimal control and resistance management: Orondis Ultra A+B; Torrent; Zampro; Orondis Ultra A+B; Torrent; Zampro.
  • a low-input strategy that focused on early control and resistance management, switching to lower-cost fungicides in the final weeks of harvest: Orondis Ultra A + B (plus Bravo); Torrent; Zampro; Bravo; Bravo; Bravo.
  • a single application of Orondis Ultra, applied early followed by the other targeted downy mildew  fungicides (Orondis Ultra A + B; Torrent ; Zampro; Torrent; Zampro; Torrent).
  • Control – no fungicides applied
Product Rotation Leaf Area Infected Defoliation
Bravo Only
(6 applications)
45% 23%
High Input 3% 0%
Low Input 40% 20%
Single Orondis Ultra in rotation 28% 8%
Control 80% 80%

Final yields for both the high input and single Orondis Ultra (in rotation) were both significantly higher than the Bravo only programs. The yields for the high input program, were significantly higher than all other treatments.

See the 2017 Downy Mildew Control Strategy for Cucumber Crops for more information.

66th Annual Muck Vegetable Growers Conference

The 66th Annual Muck Vegetable Growers Conference will be held April 12-13 at the Bradford and District Memorial Community located at 125 Simcoe St., Bradford, ON. The conference is free and registration starts at 8:30. For more details please see:  http://www.uoguelph.ca/muckcrop/muckconference.html

Continue reading 66th Annual Muck Vegetable Growers Conference

How sensitive is your crop to dicamba and 2,4-D?

Are soybeans or tomatoes more sensitive to dicamba? Are sweet potatoes or watermelon more likely to be hurt by 2,4-D? Could crops show visual injury at 1/800th of the rate of one of these products?

In a recent article in Southeast Farm Press, Dr. Stanley Culpepper, University of Georgia Extension weed specialist, shared his data on crop sensitivity (visual injury) to dicamba and 2,4-D. Note that most of this data is from trials in Georgia (and some of the crops on the list reflect that). Continue reading How sensitive is your crop to dicamba and 2,4-D?

Organic Research Needs and Priorities – Opportunity for Input

The Organic Agriculture Centre of Canada (OACC) is looking for grower input into the Canadian organic research needs and priorities assessment process. The OACC are coordinating this national process on behalf of the Research Needs Task Force of the Organic Value Chain Roundtable. The information collected through this process will be used to guide organic research priorities to direct organic funding, and so it is important that organic stakeholders in Ontario have their say.

To provide your input, please take this short (3 question) survey. The responses will be aggregated anonymously and submitted to the OACC. To learn more or to organize a priority assessment meeting with a group of growers, visit the OACC website. Continue reading Organic Research Needs and Priorities – Opportunity for Input

The Anniversary Tour Featuring…Crop Research at Ridgetown Campus, U of G

Hosted by OMAFRA & Ridgetown Campus – University of Guelph

Wednesday September 14th, 2016

Gosnell Line and Ridgetown Campus
• No cost • No preregistration required
Join the plot tour either in the afternoon or evening Continue reading The Anniversary Tour Featuring…Crop Research at Ridgetown Campus, U of G

Managing Bacterial Spot in Ontario Field Tomato Production

Cheryl Trueman, Ridgetown Campus – University of Guelph; Janice LeBoeuf, OMAFRA, Ridgetown

Bacterial spot on tomato plant and fruitBacterial spot, caused by a group of Xanthomonas bacteria, is an ongoing challenge for field tomato growers in Ontario. For many years, a program of fixed copper sprays was used to manage bacterial spot in plug transplants and field tomatoes. Knowing that copper and other products are relatively weak on bacterial disease, the strategy was to suppress populations early in the season while they are still low. Once symptoms are present, the bacterial populations are so high that we would not expect to have a significant impact on disease development with a spray program. Continue reading Managing Bacterial Spot in Ontario Field Tomato Production