Aug 22, 2016 - Insect Pest Report #6

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

The aphid counts in weeks 8 in all but one sample were low. There was one Green Peach Aphid (GPA) trapped in southern seed growing area, but not anywhere else. Potato aphids were trapped in southern and central areas. One field showed a sudden influx of aphids, probably from nearby crops being harvested or desiccated. There were low counts of Aster leafhoppers were trapped in all seed areas.

Some of the seed fields are being desiccated, so we will have one more week of aphid monitoring to report.

Below are the results from suction and pan traps in seed fields for the 6th and 7th week of sampling:
Weekly Aphid Report – Aug 09 - Aug 15 (Week 8)

Field # Town RM Green Peach Aphid Potato Aphid Other Aphids Total * ALH PLH Comments
Southern Region
Field 1, 34-1 Reinland Stanley 1 1 1 3 1
Field 2, 30-2 Chortitz Stanley Sample not available
Field 3, 35-1 Altona Rhineland 0 0 2 2 1
Central Region
Field 4, 25-7 Holland Victoria 0 5 2 7
Field 5, 26-3 Glenora Argyle 0 0 0 0 4
Field 6, 21-31 McDonald Portage La Prairie 0 0 1 1 3
Western Region
Field 7, 19-12 Wellwood North Cypress 0 45 73 119 4 Influx of aphids
Field 8, 33-11 Brookdale North Cypress 0 1 2 3 1

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

In 2016 season, as in 2015, as part of the Canadian Hort Council, Growing Forward 2, Canadian Potato Psyllid and Zebra Chip Monitoring Network project, yellow sticky cards are being sent to Dan Johnson, Univ of Lethbridge. One potato psyllid adult was confirmed today (August 22) in a card (in field July 12-18) from Northfolk-Treherne Rural Municipality. This is the first find for 2016 in a province outside Alberta.

North Dakota has also reported occurrence of potato psyllids in their fields. "We have confirmed that psyllids are present potato fields in western ND. Psyllids are the vector of zebra chip disease and can do damage without the Lso bacterium (Gary Secor, NDSU)".

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