NDSU Extension - Ramsey County


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June 20, 2011 Agriculture Column


The spray season is fully upon us and so does the rain seem to stick around.  The forecast seems to have rain for the next week.  It can quit anytime soon.  Achievement Days is fast approaching, if you have time and like to check out the different exhibits please stop by.  The days are June 29-30.


Flea Beetles Active in Canola

            Populations of crucifer and striped flea beetles increased this last week in canola near Langdon and in north central region (see Dan Waldstein’s report in this Pest Report). Early planted canola fields that have sat in the cold ground without growing for several weeks should be scouted for feeding injury (pitting) from flea beetles. Commercially applied seed treatments, such as Helix and Prosper are only effective in controlling flea beetles for ≈25 days after planting. Canola in the seedling to 4-6 leaf stage is susceptible to yield loss from flea beetles when foliage defoliation is 25% (action threshold). Canola fields should be scouted for flea beetle feeding injury. Flea beetles will be most active feeding on warm, calm days. If injury is at 25% defoliation, a foliar insecticide should be applied as a rescue treatment. A listing of insecticides registered in canola is available from the ND Field Crop Insect Management Guide 2001, E-1143, NDSU Extension Service.


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