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.
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| WEEKLY RAINFALL (mm) |
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July 9-16 |
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| Mount Royal |
4.7 |
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| Tyne Valley |
11.6 |
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| Kensington |
10.4 |
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| Tryon |
N/A |
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| New Glasgow |
16.2 |
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| Harrington |
14.4 |
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| Johnston's River |
0.6 |
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| Souris |
N/A |
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| Dover |
140.3* |
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| SOURCE: |
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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 Beetleᶟ |
Aphids - July 13 collections |
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| 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 |
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| Dover |
HIGH July 19-21 |
July 20 |
July 10 |
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| Johnston's River |
HIGH July 19-21 |
July 18 |
July 9 |
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| Charlottetown |
HIGH July 19-21 |
July 18 |
July 8 |
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| Harrington |
MED July 18-21 |
July 18 |
July 9 |
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| New Glasgow |
MED July 19-21 |
July 18 |
July 8 |
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| Baltic |
MED July 19-21 |
July 18 |
July 9 |
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| Kensington |
MED July 19-21 |
July 17 |
July 8 |
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| Tryon |
MED July 19-21 |
July 18 |
July 8 |
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| Maple Plains |
MED July 19-21 |
July 17 |
July 8 |
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| Summerside |
MED July 19-21 |
July 16 |
July 7 |
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| Tyne Valley |
LOW July 16-21 |
July 18 |
July 9 |
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| O'Leary |
MED July 19-21 |
July 20 |
July 10 |
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| North Cape |
MED July 19-21 |
July 20 |
July 10 |
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| NOTES: |
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| 1BlitecastModel assumes June 15 emergence and is purely based on weather conditions. |
| 2Predicted date of 5% eggs. Unknown dates indicate event will occur later. |
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| 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.
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