Crop Protection
The impact of fall conditions on spider mites
July 20, 2009 – A tomato that can stand up to attack by a damaging virus in greenhouse production systems is being developed by an Agricultural Research Service (ARS) scientist.
WEB EXCLUSIVE

Taming a tomato virus
A tomato that can stand up to attack by a damaging virus in greenhouse production systems is being developed by an Agricultural Research Service scientist.
June 2, 2009, Ottawa — Crop Profiles from the Pesticide Risk Reduction Program for twenty-nine crops are accessible for download on the Government of Canada Publications website. (Le français suit)
Grey mould caused by the fungus, Botrytis cinerea, is a chronically occurring disease that affects greenhouse crops worldwide. Fortunately, growers have access to a variety of tools for managing this commonly occurring disease. Such tools include chemicals and a variety of cultural controls where most emphasis should be placed because grey mould is best managed in a prophylactic or preventive manner. Understanding how these tools should be used and applying this knowledge during crop production provide the best defence against this disease.
Each year, the Society of American Florists, organizes its annual Pest Management Conference, usually held in the middle of February and alternating between the west and east coasts of the U.S. The meeting is a mix of growers, industry representatives and researchers/educators/extension specialists. The 2009 meeting was held in San Jose, California, from Feb. 19-21, and focused on a number of issues of relevance to Ontario growers.
This spring big changes are coming to the type of product Ontario garden centre retailers will be able to stock on their shelves.
The Pest Management Regulatory Agency (PMRA) recently announced the approval of a Minor Use label expansion for “Pristine” fungicide (boscalid + pyraclostrobin) for control of Botrytis grey mould and suppression of powdery mildew on greenhouse tomatoes in Canada. “Pristine” was already labelled for use on a range of Canadian specialty and minor crops in the field; however, this is the first full registration of this product in greenhouse food crops.
Gummy stem blight is a chronically occurring fungal disease that affects greenhouse cucumbers worldwide. It is caused by the fungus, Didymella bryoniae, which attacks all parts of the plant and can cause severe economic losses. Symptoms on stems consist of blackened lesions that may crack and produce a gummy, amber-coloured sap. Leaf symptoms include browning of leaf margins, and some of the affected margins can have V-shaped lesions, often with a yellow halo. Fruit symptoms are often not obvious externally, and usually consist of a tapering of the blossom end, which, when cut, is discoloured internally.
WEB EXCLUSIVE The pesticide ban: Ontario retailers react, Quebec retailer shares tips
We talked with Ontario garden centre retailers to see how the preparations for the April 22 pesticide ban are going and how they plan to educate shoppers about the changes.
April 3, 2009 - We talked with Ontario garden centre retailers to see how the preparations for the April 22 pesticide ban are going and how they plan to educate shoppers about the changes.
March 9, 2009 - Ontario’s cosmetic pesticides ban takes effect April 22, 2009. The ban protects Ontario families and children from the unnecessary risks of cosmetic pesticides by only allowing the use of certain lower-risk pesticides for controlling weeds and pests in lawns and gardens.
March 4, 2009, Ottawa — Agricultural and landscaping groups, along with Canada’s plant science industry, are disappointed with the Ontario government’s regulations banning the sale and use of pesticides for lawns and gardens.
Damping-off and root rot caused by Pythium spp. (species) is one of the most commonly occurring diseases in greenhouse crops. Most Pythium spp. principally infect young, succulent tissues and therefore infection is usually restricted to feeder roots or root tips of older plants.
Feb. 23, 2009 — “Pristine® Fungicide,” from BASF Canada, has received an Emergency Use label expansion for control of Gummy Stem Blight (Didymella bryoniae) and for suppression of powdery mildew (Podosphaera xanthii) in greenhouse cucumbers.

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