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This is graphics from a presentation at the US Canola/American Society of Agronomy Meetings in Long Beach California, November 2014. Data includes yields of winter canola when planted at different dates in the Pacific Northwest U.S. and yields of winter canola with different insect control regimes.
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Exploring Early Planting Dates
for Winter Canola in the Inland
Pacific Northwest
Jim B. Davis, Jack Brown, Megan Wingerson and Bradley Pakish
Success = Establishment + Winter Survival
Emergence: 88 GDD (4oC) One Leaf: 223 GDD Two Leaves: 267 GDD
Irrigation Makes It “Easy”
Photograph by Karen Sowers, WSU
Photograph by Dennis Roe, WSU
Varietal Differences in Survival
Insecticide Treatment
None Seed
Treatment Foliar Seed & Foliar
----------------- 1 to 9 ---------------
Control 1.21 c 5.31 b 5.69 b 7.68 a
-------------- lbs. per acre -------------
Yield 3,425 3,424 3,451 3,348
Insecticide Efficacy 2011
Insecticide Treatment
Year None Seed
Treatment Foliar Seed & Foliar
-------------- lbs. per acre -----------
2011 3,425 3,424 3,451 3,348
2012 4,276 4,499 4,143 3,925
2013 1,503 1,592 1,648 1,652
2014 1,251 a 1,474 ab 1,666 b 1,676 b
Insecticide Effects on Yield
What Date is Optimum?
Four cultivars ‘Athena,’ ‘Baldur,’ ‘Amanda’ and ‘Salut’.
Sites: Moscow and Lewiston ID, Pendleton OR, and Kalispell MT.
Planting dates: June 15, July 15 and August 15.
Seeding rate: 6 lb per acre.
Soil moisture recorded at each planting date and in October.
Second trial in 2013 and 2014 had three seeding rates.
No Montana site, LaCrosse WA, instead of Lewiston ID
Late June
Late July
Late August
Late July
Mid September
Late July
Late June
Late August
Year Planting Date
June July August
---------- % soil moisture -----------
2010 8.8 9.0 13.5
2011 10.9 16.3 16.5
2012 8.8 18.6 17.4
Average 9.5 14.6 15.8
Soil Moisture in October
Late July
Late August
Planting Date
Site June July August ------------ lbs / acre------------
2011 (Mean) 2,550 2,433 1,983
2012 (Mean) 3,114 3,324 2,878
Moscow 2013 2,096 2,019 0
Dusty 2013 2,899 3,750 2,422
Pendleton 2013 2,392 2,824 932
Moscow 2014 1,713 2,209 2,992
Mean 2,604 2,773 2,083
Planting Date 2013 and 2014
Recommendations for Growers
Chose an adapted variety. Plant into moisture. Plant as late as practical. Monitor soil moisture in fallow. Check weather forecasts. Balance work load. Don’t plant too late (300 GGD).
Control insects. Use a seed treatment. Monitor and spray if needed. Don’t panic. Buy crop insurance.
Questions?
Jim Davis
<jdavis@uidaho.edu> 208-885-4266
Jack Brown
<jbrown@uidaho.edu>
208-885-7078
http://www.cals.uidaho.edu/brassica/
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