Aphid Alert

No. 6, posted
23 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 the data becomes available.

Baker, MN 19 July	Climax, MN 20 July	Gully, MN 19 July	Hollandale, MN 21 July
Karlstad, MN 21 July	Little Falls, MN 19 July	Morris, MN 21 July	Williams, MN 19 July
Cando, MN 16 July	Hoople, ND 16 July	Linton, ND 18 July	Mandan, ND 18 July
Rolette, ND 16 July	Walhalla, ND 15 July

During the week ending 20 July, green peach aphid captures remained at essentially the same level per trap as in the previous week. We anticipate green peach captures in the traps will remain relative stable until they start moving from potatoes. This begin in early August as the potato crop matures and aphid numbers on commericial potato production increases. Captures of PVY vectors (counts here include potato aphid, but not green peach aphid) increased about 45% over the previous week. This increase in PVY vectors probably reflects the maturation of small grains and canola causing the insects to seek alternative hosts.

We have been contacted by several seed potato growers interested in the use of mineral oils as a possible means of reducing the spread of PVY. For more information on this see Robert Suranyi's report, Crop borders and Mineral Oil: Two tactics for management of PVY in seed potatoes.

Summary of aphid captures per trap in 1999 compared to same dates in 1998
	Aphids captured per trap (mean all locations)
1998			1999
Week ending	PVY vectors*	GPA	Week ending	PVY vectors*	GPA
			14 Jun	0.36	0.00
			22 Jun	2.08	0.03
			29 Jun	2.94	0.06
5 Jul	0.22	0.00	6 Jul	4.27	0.27
12 Jul	0.86	0.04	13 Jul	5.08	0.51
19 Jul	7.75	0.19	20 Jul	10.86	0.56
27 Jul	22.26	0.69
2 Aug	27.92	0.69
9 Aug	83.97	0.42
16 Aug	223.76	2.20
23 Aug	53.15	2.08
30 Aug	67.34	2.88
5 Sep	28.77	1.92
13 Sep	8.13	0.26
20 Sep	3.75	0.40
27 Sep	1.75	0.00
4 Oct	2.28	0.08

*GPA not included in PVY vectors

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 19 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	1	3.0

PVY vectors	bird cherry-oat aphid	2	6.1
	corn leaf aphid	1	3.0
	English grain aphid
	greenbug
	sunflower aphid	3	9.1
	thistle aphid	3	9.1
	turnip aphid	9	27.3

Identified non-vector species		4	12.1

Unidentified		10	30.3

	Total	33

Climax, MN, week ending 20 July (based on a sample of 183 aphids)
	Aphid species	# captured*	% of total capture
PLRV/PVY vectors	green peach aphid	4 (6)	2.2
	potato aphid	2 (3)	1.1

PVY vectors	bird cherry-oat aphid	2 (3)	1.1
	corn leaf aphid
	English grain aphid	2 (3)	1.1
	greenbug
	sunflower aphid	98 (134)	53.6
	thistle aphid	15 (21)	8.2
	turnip aphid	21 (29)	11.5

Identified non-vector species		6 (8)	3.3

Unidentified		33 (45)	18.0

	Sorted/Total*	183/251
*Actual numbers in sorted subsample (projected numbers in total collection)

Gully, MN, week ending 19 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	5	11.4
	potato aphid	1	2.3

PVY vectors	bird cherry-oat aphid	5	11.4
	corn leaf aphid
	English grain aphid	5	11.4
	greenbug
	sunflower aphid
	thistle aphid	10	22.7
	turnip aphid	11	25.0

Identified non-vector species		3	6.8

Unidentified		4	9.1

	Total	44

Hollandale, MN, week ending 20 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	1	14.3

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

Identified non-vector species		3	42.9

Unidentified		1	14.3

	Total	7

Karlstad, MN, week ending 21 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	2.1
	English grain aphid	2	4.2
	greenbug	1	2.1
	sunflower aphid	8	16.7
	thistle aphid	11	22.9
	turnip aphid	13	27.1

Identified non-vector species		7	14.6

Unidentified		5	10.4

	Total	48

Little Falls, MN, week ending 19 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	5	17.9

PVY vectors	bird cherry-oat aphid	11	39.3
	corn leaf aphid	2	7.1
	English grain aphid	1	3.6
	greenbug
	sunflower aphid
	thistle aphid	1	3.6
	turnip aphid	4	14.3

Identified non-vector species		2	7.1

Unidentified		2	7.1


	Total	28

Morris, week ending 21 Jul
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	6	8.1
	potato aphid	3	4.1

PVY vectors	bird cherry-oat aphid	2	2.7
	corn leaf aphid	1	1.4
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid	48	64.9
	turnip aphid	4	5.4

Identified non-vector species		6	8.1

Unidentified		4	5.4

	Total	74

Williams, MN, week ending 19 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	9	21.4
	corn leaf aphid
	English grain aphid
	greenbug
	sunflower aphid
	thistle aphid	18	42.9
	turnip aphid

Identified non-vector species		4	9.5

Unidentified		11	26.2

	Total	42

Cando, week ending 16 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid

PVY vectors	bird cherry-oat aphid	6	22.2
	corn leaf aphid
	English grain aphid	1	3.7
	greenbug
	sunflower aphid	5	18.5
	thistle aphid	5	18.5
	turnip aphid	4	14.8

Identified non-vector species		1	3.7

Unidentified		5	18.5

	Total	27

Hoople, week ending 16 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	2	3.9
	potato aphid

PVY vectors	bird cherry-oat aphid	18	35.3
	corn leaf aphid
	English grain aphid
	greenbug
	sunflower aphid	7	13.7
	thistle aphid	3	5.9
	turnip aphid	3	5.9

Identified non-vector species		4	7.8

Unidentified		14	27.5

	Total	51

Linton, ND, week ending 18 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	11	5.1
	potato aphid	12	5.6

PVY vectors	bird cherry-oat aphid	5	2.3
	corn leaf aphid	13	6.1
	English grain aphid	2	0.9
	greenbug
	sunflower aphid	7	3.3
	thistle aphid	1	0.5
	turnip aphid	103	47.9

Identified non-vector species		49	22.8

Unidentified		12	5.6

	Total	215

Mandan, ND, week ending 18 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid	7	6.3
	potato aphid	9	8.0

PVY vectors	bird cherry-oat aphid	21	18.8
	corn leaf aphid
	English grain aphid	1	0.9
	greenbug
	sunflower aphid	4	3.6
	thistle aphid	10	8.9
	turnip aphid	45	40.2

Identified non-vector species		8	7.2

Unidentified		7	6.3

	Total	112

Rolette, week ending 16 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	2	7.1

PVY vectors	bird cherry-oat aphid	12	42.9
	corn leaf aphid	1	3.6
	English grain aphid
	greenbug
	sunflower aphid	2	7.1
	thistle aphid
	turnip aphid	3	10.7

Identified non-vector species		3	10.7

Unidentified		5	17.9

	Total	28

Walhalla, ND, week ending 15 July
	Aphid species	# captured	% of total capture
PLRV/PVY vectors	green peach aphid
	potato aphid	1	9.1

PVY vectors	bird cherry-oat aphid	2	18.2
	corn leaf aphid
	English grain aphid	1	9.1
	greenbug
	sunflower aphid
	thistle aphid	2	18.2
	turnip aphid	3	27.3

Identified non-vector species		1	9.1

Unidentified		1	9.1

	Total	11

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