The Pest Management Regulatory Agency (PMRA) recently announced the approval of a Minor Use label expansion of Delegate Insecticide for suppression of flea beetles on several root vegetables. Crops added to the label:
Delegate was already labeled for control of diamondback moth, cabbage looper and imported cabbageworm on these crops.
The following is provided as an abbreviated, general outline only. Users should consult the complete label before using Delegate Insecticide.
Max. # of Applications per year
Pre-Harvest Interval (PHI)
Flea Beetles (suppression)
Follow all other precautions and directions for use on the Delegate label carefully.
The cabbage maggot (Delia radicum) is the larvae stage of the cabbage root fly which can cause severe damage to all Brassica crops. The adult cabbage maggot is a fly that is about half the size of a house fly and is grey in colour.
The module is a great educational tool with information for the common insect pests, diseases, viruses and disorders of potatoes in Ontario. For each pest or disease, summarized information can be found in the Beginner tab and more detailed information can be found under the Advanced tab. In the “often confused with” section of the entries you can view side-by-side photos of insects/disease/disorders that cause similar symptoms. You can also find more information on soil diagnostics, weed identification, herbicide injury, and links to additional resources.
Dennis Van Dyk, OMAFRA, Guelph; Manju Chandran and Mary Ruth McDonald, University of Guelph, Muck Crops Research Station.
For the first time in Ontario, feeding damage caused by flea beetle larvae has been confirmed in a commercial carrot field. The damage is characterized by irregularly shaped cavities along the length of the taproot (Figure 1). A trail of smaller feeding sites can sometimes be seen travelling down the length of the carrot (Figure 2).
Growing potatoes is always a challenge for Ontario potato producers. Mother Nature dictates crop development from planting until harvest, and whatever she decides is beyond growers’ control.
April was a relatively quiet, spring-transition month. There were, however, a few typical storm systems that brought moderate amounts of rain. Planting started in Leamington just before Easter; by April 15, the sprouts of early varieties such as Dakota Pearl were looking healthy and vigorous.
Planting was delayed a bit by cool weather and the occasional rain shower in other areas of Ontario. May was very dry which resulted in non-stop planting. A large potato producer in Shelburne told me that he finished planting in May, something he had not done in years. Continue reading The 2015 season: how is the potato crop doing?→
On July 9, late blight was found in a potato field near Orangeville. This is the first occurrence of potato late blight in Ontario in 2015. Infected plants were removed, and the grower is following an aggressive fungicide spray program, preventative sanitation practices and close field monitoring. All these management practices help to slow the rate of disease spread and to reduce the incidence of late blight. Samples were sent to Dr. Lawrence Kawchuck from Agriculture and Agri-Food Canada in Lethbridge. Dr. Kawchuck will identify the strain that caused this late blight outbreak.