We are currently conducting a clubroot survey for Brassica vegetables in Southwestern Ontario. To date we have identified or collected samples within eight counties and are looking to obtain samples from as many different counties as possible this field season.
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.
In the early spring, cabbage maggot flies emerge from the soil and the females lay small, white eggs ~2-10 cm below the soil line. Depending upon the temperature, eggs hatch 3-7 days later as larvae that immediately start boring Continue reading Cabbage Maggot; An old pest with limited options
Flea beetles are a common crop pest of crucifers in Ontario and overwinter as adults near the soil surface in debris and stubble from the previous crop. They typically become active with the first extended period of warm weather in the early spring as the leaf litter begins to thaw. The beetles feed on weeds throughout the field and have the ability to fly on calm days and will attack brassica seedlings as they emerge or transplants as they are planted.
Females will begin laying eggs in soil for about 30 days. Flea beetle larvae will hatch from eggs 12 days later and feed on the root hairs and taproots of seedlings. Left unchecked, adults will feed on leaves of transplants and the larvae will burrowing into the plant near the juncture of the root and stem. Continue reading Preventing Yield Loss from Flea Beetles
By Travis Cranmer, Vegetable Crops Specialist
First appeared in ONvegetables in The Grower, April 2017.
Clubroot, caused by the soil-borne pathogen Plasmodiophora brassicae can cause yellowing, stunting, wilting and club-like roots on susceptible Brassica species including broccoli, cabbage, canola and cauliflower. Clubroot causes an estimated yield loss of 10-15% in Brassica crops worldwide and in severely infested fields a 30-100% yield loss can occur. There are different races of clubroot known as pathotypes and the resistance of many cultivars is pathotype dependent.
Article originally from HortMatters, Vol. 15, Issue No. 15, 15 July 2015
Did you know that a new research project on Cabbage Maggot in vegetable brassicas has just begun? The project pulls together a team to learn about the flies, Delia flies, which cause the pest known as Cabbage Maggot. Continue reading Got cabbage maggots? Invitation to brassica growers to collaborate in research
J. Chaput, OMAFRA, Minor Use Coordinator, Guelph
The Pest Management Regulatory Agency (PMRA) recently announced the approval of URMULE registrations for Delegate Insecticide for control of several additional insect pests on several crops in Canada. Delegate Insecticide was already labeled for use on a number of crops in Canada for control of insects. Continue reading Delegate Insecticide label expanded via Minor Use Program for control of additional insects on several crops in Canada
J. Chaput, OMAFRA, Minor Use Coordinator, Guelph
The Pest Management Regulatory Agency (PMRA) recently announced the approval of URMULE registrations for SuccessTM and EntrustTM Insecticides for control of cabbage maggot on greenhouse broccoli transplants in Canada. SuccessTM and EntrustTM Insecticides were already labeled for use on many crops in Canada for a number of pests. Continue reading Success and Entrust Insecticide labels expanded via Minor Use Program for control of cabbage maggot on greenhouse broccoli transplants in Canada
Reposted from ONvegetables.com orginally posted on 15 May 2013. Flea beetle activity in brassica crops has been reported.
What species of flea beetles affect crucifer crops in Ontario?
Two species of flea beetles that commonly feed on brassica crops in Ontario are the crucifer flea beetle (Phyllotreta cruciferae) and striped flea beetle (Phyllotreta striolata). There are reports that the crucifer flea beetle is more common in Ontario than the striped flea beetle.
Braden G. Evans & Dr. Rebecca H. Hallett, School of Environmental Science, University of Guelph
The swede midge, Contarinia nasturtii, is a small, inconspicuous brown fly from the family Cecidomyiidae, the ‘gall forming’ midges (Figure 1). It is an invasive insect from Eurasia which has become established in North America, expanding its range across Canada and the United States since it was first recorded here in Ontario in 2001. This pest insect attacks economically important cole crops in the Brassica family, including broccoli, cauliflower, cabbage, and canola, among many others. The gregarious larvae live and feed among the compressed leaves surrounding the developing vegetable head, leading to direct damage to the marketable portion of the host plant.
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