Category Archives: Carrot

Carrot Weevil Control Update

Carrot weevil remains the most important insect pest to many Ontario carrot growers, and the amount of damage seems to be increasing in recent years. Carrot weevil females overwinter in the soil and plant debris and lay their eggs in cavities in the crown of the carrots. These eggs develop and hatch into larvae and begin to feed on the carrot root. Feeding damage from the carrot weevil larvae causes unmarketable tunneling near the crown of the carrot and can account for significant losses to commercial growers.

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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

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Flea Beetle Feeding Damage Found on Carrots in Ontario

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).

flea beetle feeding
Figure 1. Large amounts feeding damage caused by flea beetle larvae

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Management Strategies to Control Resistant Pigweed in Carrot Production

By: Kristen Obeid, OMAFRA Weed Management Program Lead – Horticulture and Clarence Swanton, University of Guelph

The Problem

Carrot growers in particular are struggling with resistant pigweed in Ontario fields, a problem that was studied extensively in 2011 and 2012. As far back as 1997, resistance to group 5 herbicides (prometryne) was noted. Then in 1998, resistance to group 2 (rimsulfuron) herbicides was noted. Resistance to group 7 (linuron) herbicides appeared in 1999. There are some weed populations with multiple resistance (i.e. resistance to both group 5 and group 7 herbicides or maybe even to three different herbicide groups).

Different pigweed species are showing resistance to herbicides, including:

  • Redroot pigweed (Amaranthus retroflexus, L.)
  • Green pigweed (Amaranthus powellii, S. Watson)
  • Smooth pigweed (Amaranthus hybridus, L.)
  • Common waterhemp (Amaranthus tuberculatus, syn, rudis)

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Prowl H2O Herbicide label expanded via Minor Use Program to control labeled weeds on carrots

J. Chaput, OMAF/MRA, Minor Use Coordinator, Guelph

The Pest Management Regulatory Agency (PMRA) recently announced the approval of an URMULE registration for Prowl H2O Herbicide for control of labeled weeds on carrots in Canada. Prowl H2O Herbicide was already labeled for management of weeds on corn, soybeans, snap beans, adzuki beans, dry bulb and green onions, leeks and ornamentals in Canada. Continue reading Prowl H2O Herbicide label expanded via Minor Use Program to control labeled weeds on carrots

63rd Annual Muck Vegetable Growers Conference

The 63rd Annual Muck Vegetable Growers Conference will be held April 9th and 10th, 2014 at Bradford and District Memorial Community Centre located at 125 Simcoe St., Bradford, ON. Registration opens at 8:30 am. For details, please see http://www.uoguelph.ca/muckcrop/muckconference.html.

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