Aphid Alert

No. 4, posted
9 July, 1999

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:
1998 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>

Summer 1999: Aphid trapping data.

Results reported in this issue of Aphid Alert are total captures of winged aphids and species identifications for the following locations and sampling interval end-dates. Data for missing locations will be incorporated into this week's issue of the newsletter as it becomes available.

Baker, MN 9 July	Climax, MN 6 July	Crookston, MN 5 July	Gully, MN 6 July
Hollandale, MN 7 Jul	Karlstad, MN 6 July	Little Falls, MN 6 July	Morris 6 July
Williams, MN 6 July	Cando 2 July	Hoople, ND No data	Linton, ND 5 July
Mandan, ND 5 July	Rolette 2 July	Walhalla, ND 1 July

During the week ending 6 July, total aphid captures were 254, i.e, 21.1 aphids per location compared to 20.4 aphids per location the previous week. Turnip aphid, Lipaphis erysimi (Kaltenbach), (78 aphids) and bird cherry-oat aphid, Rhopalosipum padi (L.), (59 aphids) and were the most abundant aphid species in the traps. Green peach aphids were captured at three locations, Crookston (3 aphids), Linton (4 aphids), and Mandan (1 aphid). Dr. Lockhart tested these green peach aphids using immunocapture-PCR and found that they were NOT carrying potato virus Y (PVY) or potato leafroll virus (PLRV). No positives have been reported yet this year. The first positive for PLRV last year was 6 July.

We are establishing a list of e-mail addresses to facilitate communication with those of you interested in receiving updates about this research or any resulting advisories sooner than this information can be delivered by mail or even before it is posted on the WWW. If you wish your name added to receive such messages please send us an e-mail at radcl001@umn.edu. In the message, write "Aphid Alert subscribe."

ERRORS: If you find errors, typographic or factual, we would appreciate having them called to our attention so they can be corrected. Phone: Robert Suranyi (218) 773-3346 or Ted Radcliffe (612) 624-773 or send an e-mail to radcl001@umn.edu.

RESULTS

Baker , MN, week ending 9 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	3	3.2
	potato aphid	5	5.4

PVY vectors	bird cherry-oat aphid	21	22.6
	corn leaf aphid
	English grain aphid	1	1.1
	greenbug
	sunflower aphid	1	1.1
	thistle aphid	16	17.4
	turnip aphid	14	15.2

Identified non-vector species		10	10.9

Unidentified		22	24.9
	Total	93

Climax, MN, week ending 6 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	5	62.5
	corn leaf aphid
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid	1	12.5
	turnip aphid

Identified non-vector species		1	12.5

Unidentified		1	12.5
	Total	8

Crookston, MN, week ending 5 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	3	3.0
	potato aphid	2	2.0

PVY vectors	bird cherry-oat aphid	23	23.0
	corn leaf aphid
	English grain aphid	5	5.0
	greenbug
	sunflower aphid	3	3.0
	thistle aphid	6	6.0
	turnip aphid	50	50.0

Identified non-vector species		1	1.0

Unidentified		7	7.0
	Total	100

Gully, MN, week ending 6 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	7	63.4
	corn leaf aphid
	English grain aphid	1	9.1
	greenbug
	sunflower aphid
	thistle aphid
	turnip aphid

Identified non-vector species		1	9.1

Unidentified		2	18.2
	Total	11

Hollandale, MN, week ending 6 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	1	25.0
	corn leaf aphid
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid	2	50.0
	turnip aphid

Identified non-vector species

Unidentified		1	25.0
	Total	4

Karlstad, MN, week ending 6 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	2	16.7
	corn leaf aphid	4	33.3
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid	1	8.3
	turnip aphid

Identified non-vector species		1	8.3

Unidentified		4	33.3
	Total	12

Little Falls, MN, week ending 5 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	1	3.6
	potato aphid	1	3.6

PVY vectors	bird cherry-oat aphid	14	50.0
	corn leaf aphid
	English grain aphid	3	10.7
	greenbug
	sunflower aphid
	thistle aphid	2	7.1
	turnip aphid	2	7.1

Identified non-vector species		1	3.6

Unidentified		4	14.3
	Total	28
Data not currently available

Morris, week ending 6 Jul
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	8	8.7
	potato aphid	3	3.3

PVY vectors	bird cherry-oat aphid	2	2.2
	corn leaf aphid
	English grain aphid	2	2.2
	greenbug	1	1.1
	sunflower aphid
	thistle aphid	48	52.2
	turnip aphid	8	8.7

Identified non-vector species		5	3.1

Unidentified		15	18.8
	Total	92

Williams, MN, week ending 6 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	1	14.3

PVY vectors	bird cherry-oat aphid	4	57.1
	corn leaf aphid	1	14.3
	English grain aphid	1	14.3
	greenbug
	sunflower aphid
	thistle aphid
	turnip aphid

Identified non-vector species

Unidentified
	Total	7

Cando, week ending 2 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	1	50.0
	corn leaf aphid	1	50.0
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid
	turnip aphid

Identified non-vector species

Unidentified
	Total	2

Hoople, ND, week ending 5 July
	Aphid species	# captured	% of total capture
No data this week

Linton, ND, week ending 5 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	4	8.0
	potato aphid	13	26.0

PVY vectors	bird cherry-oat aphid	1	2.0
	corn leaf aphid
	English grain aphid	1	2.0
	greenbug
	sunflower aphid	1	4.0
	thistle aphid
	turnip aphid	17	34.0

Identified non-vector species		1	2.0

Unidentified		11	22.0
	Total	50

Mandan, ND, week ending 5 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	1	6.7
	potato aphid	2	13.3

PVY vectors	bird cherry-oat aphid
	corn leaf aphid
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid
	turnip aphid	2	13.3

Identified non-vector species		5	33.3

Unidentified		5	33.3
	Total	15

Rolette, week ending 2 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid
	corn leaf aphid	1	8.3
	English grain aphid
	greenbug
	sunflower aphid	6	50.0
	thistle aphid
	turnip aphid

Identified non-vector species

Unidentified		5	41.7
	Total	12

Walhalla, ND, week ending 1 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	1	16.7

PVY vectors	bird cherry-oat aphid	4	66.7
	corn leaf aphid
	English grain aphid	1	16.7
	greenbug
	sunflower aphid
	thistle aphid
	turnip aphid

Identified non-vector species

Unidentified
	Total	6

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Last modified: Tuesday, 20 July, 1999
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