Jul 23, 2017 - Insect Pest Report # 4 (July 10 – Jul 17)

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

The aphid population has not changed much from the previous week; and remains reasonably high. Potato Aphids were trapped at one site, but no Green Peach (GPA) was trapped. For seed growers in these areas, it may be important to continue using Superior 70 Oil, with an insecticide (if not applied earlier).

One Aster leaf hopper (ALH) was trapped…. ALH numbers appear to be low this year.

Below are the results from suction and pan traps in seed fields for the 5th week of sampling.

Weekly Aphid Report – Week 5 (July 10-17)
Field # Town, RM Trap Type Green Peach Aphid Potato Aphid Other Aphids Total * ALH PLH Comments
Southern Region
Field 1, 9-1 Reinland,
Stanley
Suction
Pan Trap
0
0
0
0
21
8
29 1 0
Field 2, 30-2 Winkler,
Stanley
Suction
Pan Trap
NA NA
Field 3, 18-3 Winkler,
Stanley
Suction
Pan Trap
0
0
0
0
22
8
30 0 0
Central Region
Field 4, 30-7 Holland,
Victoria
Suction
Pan Trap
0
0
3
0
43
4
50 0 0
Field 5, 25-3 Glenora,
Argyle
Suction
Pan Trap
0
0
0
0
7
21
28 0 0
Field 6, 14-13 McDonald,
Portage
Suction
Pan Trap
0
0
0
-
18
-
18 0 0
Western Region
Field 7, 27-11 Wellwood,
N. Cypress
Suction
Pan Trap
0
0
0
0
6
8
14 0 0
Field 8, 27-11 Brookdale,
N. Cypress
Suction
Pan Trap
0
0
0
0
5
4
09 0 0
* The aphid counts are presented separately and also totals from a suction trap and 2 pan traps in a field.

European corn borer (ECB) numbers trapped with Iowa strain of the pheromone were higher in the 2nd week of trapping. It may be time to monitor closely if there are eggs and very minute larvae on the potato stems. No significant impact is expected from these low numbers in most sites.

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