Aphid Alert 1999, No. 2b, June 22

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. Additional sampling locations will be reported in next week's issue of this newsletter.

Growers should be aware that green peach aphids were captured last week at Linton, ND. Fortunately, these potential vectors tested negative for potato leafroll when tested by immunocapture-PCR. This first capture of green peach aphid occurred much earlier than our first capture of green peach aphid in 1998. Potato aphids have also been captured at many sites. These two aphids are both potato colonizers and both are capable of transmitting both potato leafroll and potato virus Y (mosaic). Green peach aphid is considered the most important vector of potato viruses.

Also, potato leafhoppers are extremely abundant in 1999. Potato leafhoppers do not transmit potato pathogens, but feeding by this insect can severely damage potatoes. Choose insecticide chemistries and rates with caution to avoid flaring aphids.

With the early arrival of green peach aphid, the high amount of virus inoculum in some seed lots planted this spring, and the wet weather which has necessitated an early initiation of spraying to control late blight, this has the potential to be a very difficult year.

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, Crookston, Gully, Hollandale, Karlstad, Little Falls, Morris, Williams
North Dakota: Cando, Hoople, Linton, Mandan, Rolette, Walhalla

Baker, MN, week ending 22 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 20 90.9
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species   1 4.6
       
Unidentified   1 4.6
       
  Total 22  

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Climax, MN, week ending 22 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 17 94.4
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   1 5.6
       
  Total 18  

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Crookston, MN, week ending 22 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid 3 15
       
PVY vectors bird cherry-oat aphid 16 80
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid 1 5
  turnip aphid    
       
Identified non-vector species      
       
Unidentified      
       
  Total 20  

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Gully, MN, week ending 22 June

  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 2 13.3
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid 1 6.7
  turnip aphid    
       
Identified non-vector species   1 6.7
         
Unidentified   4 26.7
       
  Total 15  

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Hollandale, MN, week ending 23 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 3 42.8
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid 1 14.3
  turnip aphid 1 14.3
       
Identified non-vector species      
       
Unidentified   2 28.6
       
  Total 7  

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Karlstad, MN, week ending 22 June

  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    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species   2 28.6
       
Unidentified      
       
  Total 7  

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Little Falls, MN, week ending 21 June

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

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Morris, MN, week ending 22 June

Data not available

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Williams, MN, week ending 22 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 1 10
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid 3 30
  thistle aphid 1 10
  turnip aphid    
       
Identified non-vector species   1 10
       
Unidentified   4 40
       
  Total 10  

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Cando, ND, week ending

Data not available

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Hoople, ND, week ending 22 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 10 90.9
  corn leaf aphid    
  English grain aphid    
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid    
       
Identified non-vector species      
       
Unidentified   1 9.1
       
  Total 11  

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Linton, ND, week ending 20 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid 2 5.1
  potato aphid 11 28.2
       
PVY vectors bird cherry-oat aphid 2 5.1
  corn leaf aphid    
  English grain aphid 2 5.1
  greenbug    
  sunflower aphid    
  thistle aphid    
  turnip aphid 6 15.4
       
Identified non-vector species   5 12.8
       
Unidentified   11 28.2
       
  Total 39  

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Mandan, ND, week ending 20 June

  Aphid species # captured % of total capture
PLRV/PVY vectors green peach aphid    
  potato aphid    
       
PVY vectors bird cherry-oat aphid 5 41.7
  corn leaf aphid    
  English grain aphid 1 8.3
  greenbug    
  sunflower aphid 1 8.3
  thistle aphid    
  turnip aphid 2 16.7
       
Identified non-vector species      
       
Unidentified   3 25
       
  Total 12  

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Rolette, week ending 22 June

Data not available

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Walhalla, ND, week ending 22 June

Data not available

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