This information is updated from an earlier article by Janice LeBoeuf.
We have had multiple reports of late blight in conventionally managed tomato fields this week. Typically, this disease is well managed in tomatoes with a broadspectrum fungicide program including chlorothalonil. However, high disease pressure due to environmental conditions, combined with a dense leaf canopy and rapid growth may have resulted in poor spray coverage and reduced efficacy.
Commercial growers should scout often and ensure they are using fungicides with good late blight activity in their fungicide program. When late blight is in the area, spray intervals should be shortened.
Under continued high disease pressure, growers should consider adding a targeted late blight fungicide to the spray program. If late blight has been identified in a field, use a fungicide with curative and antisporulent activity, see the table below for late blight fungicides and their properties. Continue reading Late blight alert – July 27th, 2017
Late blight has been confirmed on tomatoes in both Essex County and Chatham-Kent.
See the June 28 late blight article for details on managing late blight in field tomatoes. Continue reading Late blight update – July 4, 2017
Late blight has been confirmed on tomatoes in Chatham-Kent.
Recent weather has been conducive to the development and spread of late blight. Commercial growers should scout often and ensure they are using fungicides with good late blight activity in their fungicide program. When late blight is in the area, spray intervals should be shortened. Continue reading Late blight alert – June 28
Cheryl Trueman (Ridgetown Campus, University of Guelph) & Janice LeBoeuf (OMAFRA)
It seems like recently there have been a rash of proposed or pending pesticide regulation changes that affect field growers, and tomato growers are no exception. There are re-evaluations ongoing for a number of products used in tomatoes, including mancozeb, neonicotinoids, and Lannate, as well as Ethrel, but the big one that comes to mind for field tomato growers is the proposed changes to the use of chlorothalonil (Bravo, Echo). The final outcome of this review is not yet known, but it’s likely that significant changes to the chlorothalonil labels are coming.
Chlorothalonil is a go-to fungicide for tomato growers. Data from trials at Ridgetown Campus demonstrate its value. Chlorothalonil is often just as good at controlling early blight, Septoria leaf spot, and anthracnose fruit rot as alternative fungicides, and it also provides protection from late blight, which many targeted fungicides do not. It’s a good value active ingredient for tomato disease management and has a low risk of resistance development. But, if proposed changes go through, the number of chlorothalonil applications you can use will be drastically cut.
So, have you thought about how you are going to adapt? Continue reading Making Lemonade Out of Lemons – A Tomato Fungicide Stewardship Tip Amidst Changing Regulations
Darren Robinson, University of Guelph, Ridgetown Campus; Janice LeBoeuf, OMAFRA, Ridgetown
Herbicides are useful tools for the management of weeds. The herbicides registered for use in tomatoes are selective in their activity, injuring or killing weeds while being safe to use on the crop. Crop injury may occur, generally when a crop is stressed beyond its ability to adequately deal with a herbicide application. Injury due to herbicides can arise as a result of several factors, including weather-related stress, soil factors such as light soil texture and low soil organic matter, shallow planting and sensitive crop varieties. The pages in this section contain information on herbicide injury for several products registered on tomatoes in Canada. Continue reading Herbicide injury symptoms in tomatoes
Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown
Healthy and hardy transplants are a critical part of a successful season. When field planting is delayed by rain, rain, rain, or cold weather and plug transplants must be held, it is important to monitor them closely to maintain plant health and vigour.
Plug transplants can be held in the greenhouse but if already shipped to the field grower, can be stored outside, in an area that receives direct sunlight and is sheltered from the wind. The racks should be elevated to prevent root growth through the bottom of the plugs. If there is a risk of frost, be sure to bring the transplants inside – to a building, a shed, or a greenhouse/hoophouse, if you have one available. Plants should not generally be stored in an enclosed trailer or building for more than 1 or 2 days, as this may result in very soft, elongated plants, especially in crops such as tomatoes. Continue reading Holding Vegetable Plug Transplants
District 1 of the Ontario Processing Vegetable Growers and OMAFRA present…….
The 41st Annual Tomato Day
Thursday, March 2, 2017 8:00 am – 2:00 pm
Countryview Golf Course
25393 St. Clair Rd. (Hwy 40), Dover Centre, ON
Admission: $30 (includes educational program, trade show, hot lunch).
No preregistration required.
Program: Continue reading Tomato Day 2017