Copy
View this email in your browser
JULY 16, 2020
POTATO PEST UPDATE


Prepared by Lorraine MacKinnon, Potato Industry Coordinator
For any issues related to content, please contact Lorraine MacKinnon at 902-314-1607.

This Pest Update combines information from a variety of sources to provide growers and field staff with general pest levels reported on a weekly basis.  The dashboard is NOT intended as a decision tool for spraying on its own; rather growers are encouraged to use integrated pest management strategies specific to their own fields. 

THIS WEEK'S CROP SNAPSHOT

  • Fields across PEI are at or near row closure; generally excellent crop development.
  • Some herbicide injury has been noticed.
  • No volunteer weather stations on PEI reported greater than 1.5 mm on July 15.
  • Periods of HIGH LATE BLIGHT RISK (based on weather alone) are upcoming in some locations.  See table below.
  • Spore trapping services have detected Alternaria solani (early blight) spores in several areas across Prince County, but NOT east of Pownal.  
  • Botrytis spores have also been detected in several locations around the Island. 
  • NOTE:  Spore trapping collections were interrupted by weather in central PEI (between Kinkora and Pownal) on July 15.
  • No late blight spores have been trapped on PEI, NB or Maine.
  • Regional spore trapping services provided by AirSpore (Lab'Eau-Air-Sol).
  • Late blight spores have been trapped in Alberta.
  • Colorado Potato Beetle life stage is advanced compared to last year - populations mostly at 3rd and 4th instar stage.
  • Weed control has been a challenge.
  • NEXT POTATO FIELDWORKER MEETING:  7:30am JULY 28 (email lormackinnon@gov.pe.ca for link to online webinar)
 

MORE INFO & RESOURCES

  • Submit suspect plant samples to  the PEI Analytical Labs.  Sample submission form here 
  • Disease samples should always first be submitted to PEI Analytical Labs, and can be sent on for further testing from there.
  • PEIDAL staff & local researchers seek insect and weed samples for further study - Colorado Potato Beetle, European Corn Borer, resistant weed populations.  Contact Lorraine @ lormackinnon@gov.pe.ca or 902-314-1607 for instructions on submitting samples.
  • For integrated pest management strategies, click here
  • For the 2020 Potato Pest Control Guide, click here.
  • For Potatoes in Canada magazine's scouting resources, click here.

WEEKLY RAINFALL (mm)  
  July 9-16  
Mount Royal 4.7  
Tyne Valley 11.6  
Kensington 10.4  
Tryon N/A  
New Glasgow 16.2  
Harrington 14.4  
Johnston's River 0.6  
Souris N/A  
Dover 140.3*  
SOURCE:     
https://campbellcloud.io/map_accumulation.php
*Volunteer weather stations nearby have reported significantly less rainfall.
 

PEI ANALYTICAL LAB SUMMARY

Sample submission to date has identified the following diseases:  bacterial blackleg, brown spot (alternaria alternata), fusarium and calico virus.
Several samples were submitted as a result of poor emergence.  A variety of issues were identified - fusarium, physiologically aged seed, blind sets, bacterial rot, and multiple sprouts.  


POTATO PEST DASHBOARD

Predicted Pest Levels & Events for July 16-21.  For explanation, see notes below.


  Late Blight¹ European Corn Borer² Colorado Potato Beetle Aphids - July 13 collections      
East Point HIGH July 18-19
MED July 20-21
July 21 July 11 5.3 other aphids; slight increase noticed this week across PEI.

Some Potato Aphids found, low numbers.
     
Souris HIGH July 18-19
MED July 20-21
July 19 July 9      
Dover HIGH July 19-21 July 20 July 10      
Johnston's River HIGH July 19-21 July 18 July 9      
Charlottetown HIGH July 19-21 July 18      July 8      
Harrington MED July 18-21 July 18 July 9      
New Glasgow MED July 19-21 July 18     July 8      
Baltic MED July 19-21 July 18 July 9      
Kensington MED July 19-21 July 17 July 8      
Tryon MED July 19-21 July 18 July 8      
Maple Plains MED July 19-21 July 17 July 8      
Summerside MED July 19-21 July 16 July 7      
Tyne Valley LOW July 16-21 July 18 July 9      
O'Leary MED July 19-21 July 20 July 10      
North Cape MED July 19-21 July 20 July 10      
             
NOTES:              
1BlitecastModel assumes June 15 emergence and is purely based on weather conditions. 
2Predicted date of 5% eggs.  Unknown dates indicate event will occur later.  
3Predicted date of 85% 1st & 2nd instar Colorado Potato Beetle.  This event has already occurred.  

IMPORTANT:  Ratings are based on a combination of reported cases, trapped spores, and weather conditions conducive to disease.  ECB, CPB and late blight ratings were generated using CIPRA software (Agriculture and Agri-Food Canada, Saint jean sur Richelieu, QC), and Blitecast.  For more detailed information on pest modelling and other monitoring tools contact Sebastian Ibarra, 902-314-0388 or sibarra@gov.pe.ca
Insect ratings are based on growing degree models specific to that pest; actual observations reported in Fieldworker meeting summary below.
POTATO FIELDWORKER MEETING SUMMARY

The July 14 potato fieldworker meeting captured the following observations:
  • Reports of volunteers in non-potato fields.  These need to be watched; glyphosate may not be effective at getting rid of volunteers, and there is a risk of pest infestation (Colorado Potato Beetle) and disease spread (late blight, PVY) to nearby potato fields.
  • Lots of fields at row closure now; some in blossom.
  • Variable rainfall across the Island.
  • Several reports of Colorado Potato Beetle damage.  Some samples sent for insecticide resistance.
  • European Corn Borer egg masses have been found in West Prince and areas just east of Charlottetown.  REMINDER:  The threshold for ECB is cumulative for the season; so if you found 2 egg masses per ten plants last week and 1 per ten plants this week then you are at 3.
  • Some Tarnished Plant Bugs found but damage not as bad as other years.  
  • Any cull piles need to be reported and destroyed immediately. Call Dwight Thompson (902-620-3119) to assist in destruction.


                        
                                           

Twitter
Website
Our mailing address is:
PEI Department of Agriculture & Land
11 Kent Street, 5th Floor Jones Building
Charlottetown, PEI
C1A 7N8

Want to change how you receive these emails?
You can update your preferences or unsubscribe from this list.

 






This email was sent to lormackinnon@gov.pe.ca
why did I get this?    unsubscribe from this list    update subscription preferences
Prince Edward Island Department of Agriculture & Land · 11 Kent Street · 5th Floor, Jones Building · Charlottetown, Pe C1A 7N8 · Canada

Email Marketing Powered by Mailchimp