Jul 24, 2015 - Insect Pest Report #5

Dr. Vikram Bisht
Plant Pathologist, Potato & Horticultural Crops, Manitoba Agriculture, Foods & Rural Initiatives


No Green Peach Aphid (GPA) has been trapped yet. Also, leafhoppers were not trapped this week from these selected seed fields. Aphid activity in southern and western regions of MB seed fields has stayed about similar to the previous week. More aphids were trapped in the central seed production area compared to last week, suggesting that the seed fields need to be monitored closely. Aphid activity appears to be low in MN/ND, with some GPA being trapped.

Pan traps in canola and potato fields are catching similar and low number of aphids.

More reports of young larval CPB activity sporadic in some seed-treated fields. If scouting shows that such CPB feeding in continuing to increase, then foliar insecticide application with chemistry different from the seed treatment should be used. Use of a different active ingredient will help reduce the risk of breakdown of the insecticide efficacy.

Survey for the potato psyllids has begun. Yellow sticky cards are being used for the survey in commercial potato fields. There was no potato psyllid trapped in MB in 2014.

Below are the results from suction and pan traps in seed fields.

Weekly Aphid Report – July 13 - July 20 (Wk 5)

Field # Town RM Green Peach Aphid Potato Aphid Other Aphids Total * ALH PLH Comments
Southern Region
Field 1,3-2 Gnadenthal Rhineland 0 2 7 9 0 0
Field 2,30-2 Winkler Rhineland 0 3 5 8 0 0 0 aphids in 2 pans
Canola,30-2 0 0 2 2 0 0 From 2 pans
Field 3,9-2 Chortitz Stanley 0 1 3 4 0 0
Central Region
Field 4,4-6 Swan Lake Lorne 0 0 9 9 0 0
Field 5,26-3 Glenora Argyle * * * * * * Sample Unavailable
Field 6,21-31 Portage La Prairie Portage La Prairie 0 2 4 6 0 0
Western Region
Field 7,19-12 Wellwood North Cypress 0 0 4 4 0 0
Field 8,30-11 Douglas North Cypress 0 0 1 1 0 0
Field 9,5-31 Wellwood North Cypress 0 0 3 3 0 0


* The aphid counts are a summation from a suction trap and 2 pan traps in a field
** Canola – only 2 pan traps

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