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.
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 |
| 5-Jul |
0.22 |
0 |
| 12-Jul |
0.86 |
0.04 |
| 19-Jul |
7.75 |
0.19 |
| 27-Jul |
22.26 |
0.69 |
| 2-Aug |
27.92 |
0.69 |
| 9-Aug |
83.97 |
0.42 |
| 16-Aug |
223.76 |
2.2 |
| 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 |
0.4 |
| 27-Sep |
1.75 |
0 |
| 4-Oct |
2.28 |
0.08 |
|
| Week ending |
PVY vectors* |
GPA |
| 14-Jun |
0.36 |
0 |
| 22-Jun |
2.08 |
0.03 |
| 29-Jun |
2.94 |
0.06 |
| 6-Jul |
4.27 |
0.27 |
| 13-Jul |
5.08 |
0.51 |
| 20-Jul |
10.86 |
0.56 |
|
*GPA not included in PVY vectors
We maintain 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
Minnesota: Baker, Climax, Gully, Hollandale, Karlstad, Little Falls, Morris, Williams
North Dakota: Cando, Hoople, Linton, Mandan, Rolette, Walhalla
Baker, MN, week ending 19 July
| |
Aphid species |
# captured |
% of total capture |
| PLRV/PVY vectors |
green peach aphid |
|
|
| |
potato aphid |
1 |
3 |
| |
|
|
|
| PVY vectors |
bird cherry-oat aphid |
2 |
6.1 |
| |
corn leaf aphid |
1 |
3 |
| |
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 |
|
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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 |
| |
|
|
|
| |
Sorted / Total * |
183 / 251 |
|
*Actual numbers in sorted subsample (projected numbers in total collection)
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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 |
| |
|
|
|
| Identified non-vector species |
|
3 |
6.8 |
| |
|
|
|
| Unidentified |
|
4 |
9.1 |
| |
|
|
|
| |
Total |
44 |
|
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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 |
|
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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 |
|
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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 |
|
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Morris, MN, week ending 21 July
| |
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 |
|
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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 |
|
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Cando, ND, 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 |
|
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Hoople, ND, 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 |
|
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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 |
|
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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 |
| |
|
|
|
| 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 |
|
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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 |
|
back to top
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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