Aphid Alert

No. 12, 2000
27 August

Published cooperatively by
departments of Entomology & Plant Pathology,
College of Agricultural, Food and Environmental Sciences, University of Minnesota,
the University of Minnesota Extension Service,
and the State Seed Potato Programs of 
Minnesota and North Dakota

Funding provided by:
Minnesota State Legislature &
United States Department of Agriculture,
Cooperative State Research, Education and Extension Service,
Integrated Pest Management Program,
North Central Region

WWW address: http://ipmworld.umn.edu/alert.htm

Aphid captures reported by location for week ending 27 August.  Data reported here only for locations with links.

Update: Summary of virus vector situation through 27 August.

Happily, the week ending 30 August saw another sharp decline in aphid flight activity.  Captures of green peach aphid averaged 0.20 per trap compared to 0.58 the previous week.  Captures of other aphid species that are potential virus vectors also declined to 6.63 per trap compared to 19.17 the previous week.  Across all sampling dates, captures of both green peach aphid and other potential virus vectors in 2000 were only 1/5th of what they were in 1999.  This should translate into fewer seed lot rejections for virus this winter.  However, late season flights of green peach aphid are cause for particular concern.  These aphids are mostly coming from commercial potato fields and are likely to be carrying virus.   Most seed potato fields have already been killed, but any still remaining should be protected with an effective aphidicide until vine kill is accomplished.

Captures of winged aphids (mean number per trap), 1992-1994 & 1998-2000, Data for Minnesota and North Dakota locations in the Aphid Alert trapping network.
	Fig. 1. Captures of winged green peach aphid per trap.
	Fig. 2. Captures potential PVY vectors other than green peach aphid per trap.
	Fig. 3. Captures of winged turnip aphid per trap.
	Fig. 4. Captures of winged small grain aphids (i.e., bird cherry-oat aphid, English grain aphid and greenbug) per trap.
	Fig. 5. Captures of sunflower aphid per trap.
	Fig. 6. Captures of other potential PVY vectors (including potato aphid, corn leaf aphid, thistle aphid, and others) per trap.

Visit Jeff Miller's Late Blight Site

Trap locations in 2000

Status of Aphid Alert project

MINNESOTA

Baker
28 August

Climax 28 August

Crookston
30 August

Gully
28 August

Hollandale
No data

Karlstad
28 August

Aphids per trap per week

Species

PLRV/PVY vectors  

green peach aphid

1 (14.3)

1 (2.5)

potato aphid

PVY vectors

bird cherry-oat aphid

corn leaf aphid

6 (66.7)

3 (42.()

25 (62.5)

4 (18.2)

English grain aphid

greenbug

sunflower aphid

thistle aphid

2 (9.1)

turnip aphid

2 (28.6)

3 (7.5)

4 (18,2)

Other PVY vectors

2 (9.1)

Non-vectors and unidentified

non-vectors

unidentified

3 (33.3)

1 (14.3)

5 (12.5)

8 (36.4)

Totals

9

7

40

27

No data

1

Little Falls
No data

Barnesville
28 August

Rice
No data

Rosemount
28 August

Thief River
No data

Williams
28 August

Aphids per trap per week

PLRV/PVY vectors

4 (2.6)

PVY vectors

7 (4.5)

1 (7.7)

2 (33.3)

44 (28.2)

5 (38.5)

1 (0.6)

1 (16.7)

2 (15.4)

3 (1.9)

4 (30.8)

Other PVY vectors

85 (54.5)

Non-vectors and unidentified

non-vectors

1 (16.7)

unidentified

2 (33.3)

12 (7.7)

1 (7.7)

Totals

No data

6

No data

156

No data

13

Cando
24 August

Hoople
24 August

Linton
28 August

Mandan
28 August

Minot
28 August

Rolette
24 August

Walhalla
24 August

Aphids per trap per week

PLRV/PVY vectors

1 (3.5)

2 (14.3)

1 (8.3)

1 (1.4)

PVY vectors

2 (5.3)

3 (10.3)

1 (33.3)

19 (50)

38 (52.9)

5 (17.2)

3 (21.4)

2 (16.7)

2 (6.9)

1 (7.1)

5 (13.2)

22 (30.6)

7 (24.1)

3 (21.4)

1 (3.5)

2 (14.3)

7 (58.3)

1 (33.3)

3 (100)

1 (2.6)

8 (27.6)

1 (7.1)

2 (16.7)

2 (5.3)

1 (3.5)

Non-vectors and unidentified

1 (2.6)

1 (3.5)

1 (7.1)

8 (21.1)

11 (15.3)

1 (7.1)

3

3

38

72

29

14

12