Aphid Alert 1999, No. 14, September 13

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. At some locations the potato crop has been harvested. If additional data is received for locations not reported on this page (no data) that data be incorporated into this week's issue of the newsletter once the samples have been received and sorted.

Figure 1 (below). Mean number of winged green peach aphid captured per trap across all locations reported, 1998 data (blue line) and 1999 data (maroon line). These data are also available in table format (Table 1).

Figure 2 (below). Mean number of winged aphids of species known to be capable of transmitting PVY (exclusive of green peach aphid) captured per trap across all locations reported, 1998 data (blue line) and 1999 data (maroon line). These data are also available in table format (Table 1).

Summary of Observations for Week Ending 13 September

Winged green peach aphids were captured at only one location, Hoople, ND, during the week ending 13 September. Other aphid species that are potential vectors of PVY averaged 4.11 per trap across all locations. Thus, aphid numbers continued to decline for the fourth week in a row. Trap capture data is reported here for only 9 of the 14 stations in the network. Any missing data will be added to this WWW report as it becomes available and associated files will be updated accordingly. PCR tests to determine if the captured green peach aphids were carrying virus will be reported here when the tests are completed. Next week will be the final week of aphid sampling for the 1999 season.

An article describing the Aphid Alert project has been submitted for publication in the September issue of the World Potato Congress Newsletter. Advance copy of the submitted article has been posted on our server for your information, Aphid Alert: A research/outreach initiative addressing potato virus problems in the northern Midwest.

The text of the WPC newsletter article is similar to a proposal we shall submit next week to the University of Minnesota, College of Agriculture, Food and Environmental Sciences, Rapid Agricultural Response Fund, requesting continued funding of this project for three more years.

A number of you have written letters in support of continuyed funding of this project. We thank you for your support, it is really appreciated. If any of our readers have suggestions for improvement of this project, please send us e-mail.

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 13 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 7 46.7
  corn leaf aphid 6 40
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   2 13.3
       
  Total 15  

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Climax, MN, week ending 13 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid    
  corn leaf aphid 3 75
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   1 25
       
  Total 4  

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Gully, MN, week ending 13 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid
  potato aphid    
       
PVY vectors bird cherry-oat aphid 2 8.7
  corn leaf aphid 20 87
  English grain aphid 1 4.3
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified      
       
  Total 23  

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Hollandale, MN, week ending 13 September

Data not available

Karlstad, MN, week ending 8 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid    
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   1 100
       
  Total 1  

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Little Falls, MN, week ending 13 September

Data not available

Morris, MN, week ending 13 September

Data not available

Williams, MN, week ending 6 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid
  potato aphid    
       
PVY vectors bird cherry-oat aphid 15 12
  corn leaf aphid 104 83.2
  English grain aphid 1 0.8
  greenbug    
  sunflower aphid 3 2.4
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   2 1.6
       
  Total 125  

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Cando, ND, week ending 10 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid
  potato aphid    
       
PVY vectors bird cherry-oat aphid 1 33.3
  corn leaf aphid 1 33.3
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid 1 33.3
       
Identified non-vector species      
       
Unidentified      
       
  Total 3  

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Hoople, ND, week ending 10 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid 12 46.2
  potato aphid 1 3.8
       
PVY vectors bird cherry-oat aphid 1 3.8
  corn leaf aphid 11 42.3
  English grain aphid 1 1.3
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid 1 33.3
       
Identified non-vector species      
       
Unidentified      
       
  Total 26  

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Linton, ND, week ending 13 September

Data not available

Mandan, ND, week ending 13 September

Data not available

Rolette, week ending 10 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid
  potato aphid    
           
PVY vectors bird cherry-oat aphid 2 50.0
  corn leaf aphid 1 25.0
  English grain aphid    
  greenbug    
  sunflower aphid 1 25.0
  thistle aphid    
  turnip aphid    
         
Identified non-vector species       
       
Unidentified      
       
  Total 4  

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Walhalla, ND, week ending 10 September

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid
  potato aphid    
       
PVY vectors bird cherry-oat aphid    
  corn leaf aphid 3 60
  English grain aphid 1 20
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   1 20
       
  Total 5  

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