Late blight resources

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

More photos and information on identifying late blight can be found at:

Vegetable Crop Update – late blight look-alikes

Ontario CropIPM

Cornell – Long Island late blight on tomato

Purdue late blight resources and news

A weekly late blight update from Cornell provides information on late blight confirmations in New York and surrounding states as well as a list of late blight resources online.

Tomato late blight management in Ontario

by Michael Celetti, OMAFRA

Managing late blight requires a proactive and integrated approach including scouting, cultural methods and fungicide application. Here are some tips to consider for managing this disease.

Crop Scouting:

Tomato growers should try to monitor their crops twice a week for the disease. If a few plants are observed to be infected, they should be placed in a sealed plastic garbage bag, removed and destroyed away from the field as soon as the disease is observed. Volunteer tomato or potato plants in nearby fields should also be destroyed since they may be a source of the disease. If a large area of plants are found to be infected it will be impractical to remove them from the field. Disking under large areas of infected plants and applying a fungicide with some kick back has proved to be successful in managing the disease while minimizing losses for some growers, provided the epidemic has been caught early. Continue reading Tomato late blight management in Ontario

Late blight in Ontario tomatoes, potatoes

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

Yesterday (August 4), late blight was confirmed in tomatoes near Simcoe, Ontario and in potatoes in the Alliston area.  Reports of late blight were also received from another location near Simcoe and one near Milton.

This may indicate that late blight spores have reached much of southern Ontario.  Tomato growers should implement a protectant fungicide program immediately and scout their fields carefully. Late blight can devastate a tomato crop very quickly if conditions are favourable.  Remember that conventional tomato growers following a regular fungicide spray program (by calendar or TOMcast) for early blight, septoria leaf spot, and anthracnose, are also protecting the crop from late blight infection. Continue reading Late blight in Ontario tomatoes, potatoes

Some recent pesticide registrations for tomatoes and peppers

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

Productactive ingredient Crop Pests Notes
Rimon 10 ECnovaluron Peppers European corn borer Minor use registration, June 2010.First application should be made just before egg hatch.
Oberon Flowablespiromesifen Fruiting vegetables Two-spotted spider mite, broad mite, whiteflies March 2010.
Dynasty 100 FS Seed Treatmentazoxystrobin Fruiting vegetables Seed rot and pre-emergence damping-off caused by Rhizoctonia solani Minor use registration, March 2010.For imported seed only. Not for domestic commercial or on-farm treatment.
Dual Magnum/ Dual II Magnums-metolachlor Non-bell peppers Weeds Minor use registration, February 2010.Previously registered on bell peppers only.
Echo 720/
Echo 90 DFchlorothalonil
Tomatoes Early blight, late blight, septoria leaf spot, anthracnose November 2009.
Actara 25 WGthiamethoxam Fruiting vegetables Aphids Minor use registration, October 2009.

New retail sign and label toolkit for vendors of Ontario fruit and vegetables

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

Clear and accurate labelling and signage help consumers make informed purchasing decisions. If you sell Ontario-grown fruit and vegetables at the farm gate, roadside stands, farmers’ markets or any other retail location, your signs and labels must comply with Regulation 378, Grades – Fruit and Vegetables under the Farm Products Grades and Sales Act, which regulates the grading, packing, marking and marketing of designated farm products.

OMAFRA’s new Retail Sign and Label Toolkit provides tips and easy-to-use, downloadable templates and instructions.  For more information contact: 1-877-424-1300.

Changes to PMRA pesticide label search online

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

Update: February 2011

The PMRA has now implemented a new pesticide label search online, but I’m happy to report that the pdf files of pesticide labels remain available online.  As in the previous search tool, you can open the pdf file of the label by clicking the registration number in the search results.  See the February 10, 2011 post for more information.

In the name of accessibility, the PMRA is removing the pdf files of pesticide labels from their online label search site.

In the past, you could visit their online pesticide label search tool to search by active ingredient, product name, keyword, or other criteria.  You could then click on the product registration number to open/print/download a pdf of the most up-to-date label.

Now, according to a notice on their website “full documentation (portable document format [pdf]) will only be available by request through email or postal mail.”  This is to be implemented this summer.

Tomato vine decline update

Janice LeBoeuf, OMAFRA Vegetable Crop Specialist, Ridgetown

In June, proactive examinations of tomato roots of healthy-looking plants showed that a number of tomato fields were showing root symptoms indicative of corky root, similar to those seen in 2009.  Typical symptoms on the roots include a lack of fine feeder roots, a small root system, and brown bands on the roots.  The outer layer of affected roots can often be stripped off very easily by pinching them between your thumb and finger.  Some roots have stubby, swollen stumps where the end of the root has died off.  In severe cases, the entire root systems turns brown and the outer portion of the roots rot off. (photos below)

In the last couple of weeks, above-ground symptoms of vine decline have also become evident in some fields.  This shows up as premature yellowing and death of foliage that cannot be explained by the presence of other foliar diseases (photos below).  Plants may also be stunted; not reaching the size that you would normally expect.  In 2009, above-ground symptoms seemed to come on very suddenly when hot, dry weather hit.

Management Continue reading Tomato vine decline update

Information for commercial vegetable production in Ontario