canola weed management eric p. prostko and tim l. grey extension weed specialist and research weed...
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CANOLA WEED MANAGEMENT
Eric P. Prostko and Tim L. GreyExtension Weed Specialist and Research Weed Scientist
The University of Georgia
April 2007
Before Getting StartedBefore Getting Started
What herbicides were What herbicides were used in previous used in previous crops?crops?
Canola is very Canola is very sensitive to herbicide sensitive to herbicide residues!!residues!!
Canola Rotation RestrictionsCanola Rotation RestrictionsHerbicideHerbicide Canola Plant-BackCanola Plant-Back
AtrazineAtrazine 12 months12 months
AccentAccent 10 months (10 months (≤ 6.5 pH)≤ 6.5 pH)
CadreCadre 40 months40 months
0 (?) months (Clearfield)0 (?) months (Clearfield)
ClassicClassic 18 months18 months
DirexDirex 24 months24 months
EnvokeEnvoke 18 months + FB18 months + FB
ReflexReflex 18 months18 months
StapleStaple 10 months + FB10 months + FB
StrongarmStrongarm 30 months + FB30 months + FB
ValorValor 12 months + FB12 months + FB
FB = Field Bioassay
Avoid Planting Canola in Wild Avoid Planting Canola in Wild Radish/Mustard FieldsRadish/Mustard Fields
Follow All UGA Recommended Follow All UGA Recommended Production PracticesProduction Practices
Adapted Variety Adapted Variety Planting DatePlanting Date
– North Zone (September 10 to October 25)
– South Zone (October 10 to November 15)
Row Spacing (6-12”)Row Spacing (6-12”) Seeding Rate (4-6 lbs/A)Seeding Rate (4-6 lbs/A) Fertility ManagementFertility Management
Herbicides For Use in Georgia Herbicides For Use in Georgia CanolaCanola
GlyphosateGlyphosate– at-planting but before crop emergence
Treflan,Trilin, etc.Treflan,Trilin, etc.– PPI
Select/Arrow, Poast, Assure/TargaSelect/Arrow, Poast, Assure/Targa– POST (grass control)
BeyondBeyond– POST– Clearfield varieties only!!!!Clearfield varieties only!!!!
Trifluralin in CanolaTrifluralin in Canola
Incorporate to depth of 2-Incorporate to depth of 2-3” within 24 hours of 3” within 24 hours of applicationapplication
2-pass system2-pass system 0.50-0.75 lb ai/A0.50-0.75 lb ai/A some control of winter some control of winter
annual grasses, henbit, annual grasses, henbit, and chickweedand chickweed
no control of wild no control of wild radish/mustardradish/mustard
Better than nothing!Better than nothing!
Clearfield Canola Production SystemsClearfield Canola Production Systems Non-GMONon-GMO BeyondBeyond (imazamox) is only herbicide (imazamox) is only herbicide
registered for use in U.S.registered for use in U.S. Based on UGA field trials, eliminates Based on UGA field trials, eliminates
concerns for Cadre (imazapic) carryover concerns for Cadre (imazapic) carryover problems. However, Clearfield canola is problems. However, Clearfield canola is NOTNOT listed on Cadre label. listed on Cadre label.
Clearfield Canola varieties only!!!!!Clearfield Canola varieties only!!!!! Beyond 1AS (imazamox)Beyond 1AS (imazamox) 4 oz/A + NIS @ 0.25% v/v + UAN @ 2.5% v/v4 oz/A + NIS @ 0.25% v/v + UAN @ 2.5% v/v weeds less than 3” tallweeds less than 3” tall In UGA field trials, Beyond has provided good to In UGA field trials, Beyond has provided good to
excellent control of Italian ryegrass, wild radish excellent control of Italian ryegrass, wild radish and shepherd’s-purse when applied between 24 and shepherd’s-purse when applied between 24 and 37 DAP.and 37 DAP.
$515/gal ($16.09/A)$515/gal ($16.09/A)
ROTATIONAL CROP RESTRICTIONS FOR BEYONDROTATIONAL CROP RESTRICTIONS FOR BEYOND
3 months = wheat3 months = wheat 4 months = barley, rye4 months = barley, rye 8.5 months = field/sweet corn8.5 months = field/sweet corn 9 months = cabbage, cantaloupe, carrot, cotton, 9 months = cabbage, cantaloupe, carrot, cotton,
cucumber, grain sorghum, oats, onion, peanut, cucumber, grain sorghum, oats, onion, peanut, pepper, tobacco, tomato, turnip, watermelonpepper, tobacco, tomato, turnip, watermelon
18 months = non-Clearfield canola18 months = non-Clearfield canola
Weed Control in Clearfield Canola with Beyond Weed Control in Clearfield Canola with Beyond 1AS (4 oz/A) + COC (1% v/v) + 37% UAN (2 qts/A)1AS (4 oz/A) + COC (1% v/v) + 37% UAN (2 qts/A)
Weed Weed TimingTiming 2001-2002’2001-2002’ 2002-2003’2002-2003’ AverageAverage
Wild Wild
radishradish
24 DAP24 DAP 9494 9898 9696
37 DAP37 DAP 9494 9898 9696
Italian Italian ryegrassryegrass
24 DAP24 DAP 7575 9090 8383
37 DAP37 DAP 6969 9090 8080
HenbitHenbit 24 DAP24 DAP 8686 7474 8080
37 DAP37 DAP 6868 7474 7171
Shepherd’s-Shepherd’s-pursepurse
24 DAP24 DAP 9999 9090 9595
37 DAP37 DAP 9999 9191 9595
Wild garlicWild garlic 24 DAP24 DAP 6060 9292 7676
37 DAP37 DAP 6060 9494 7777
Grey et al. 2006. Weed Technology 20:551-557
StingerStinger
clopyralidclopyralid labeled but labeled but notnot yet recommended by UGA yet recommended by UGA 3 lb ai/gal3 lb ai/gal 4-8 oz/A ($15-30/A)4-8 oz/A ($15-30/A) 2 to 6 leaf stage of canola2 to 6 leaf stage of canola 50 day PHI50 day PHI Canada thistle, sowthistle, dandelion, chamomileCanada thistle, sowthistle, dandelion, chamomile RotationsRotations
– 0 months = field corn, wheat, barley, oats– 10.5 months = grain sorghum, onions, sunflowers– 18 months = all other crops
Other Types of Herbicide-Other Types of Herbicide-Resistant CanolaResistant Canola
Roundup-Ready (RR)Roundup-Ready (RR) Liberty-Link (LL)Liberty-Link (LL) both are both are not not currently currently
labeled for use in Georgialabeled for use in Georgia Why?Why?
– Developed after Georgia stopped growing canola on a commercial basis
– varieties more susceptible to blackleg
– volunteer problem in other RR crops
– herbicide resistance issues
Weed Control in RR-Canola with Roundup Weed Control in RR-Canola with Roundup Weathermax 5.5SL (22 oz/A)Weathermax 5.5SL (22 oz/A)
Weed Weed TimingTiming 2001-2002’2001-2002’ 2002-2003’2002-2003’ AverageAverage
Wild Wild
radishradish
24 DAP24 DAP 7979 9090 8585
37 DAP37 DAP 9696 9090 9393
Italian Italian ryegrassryegrass
24 DAP24 DAP 8383 9090 8787
37 DAP37 DAP 9090 9191 9191
HenbitHenbit 24 DAP24 DAP 7373 9090 8282
37 DAP37 DAP 9595 9191 9393
Shepherd’s-Shepherd’s-pursepurse
24 DAP24 DAP 9999 9090 9595
37 DAP37 DAP 9999 9292 9696
Wild garlicWild garlic 24 DAP24 DAP 6161 9090 7676
37 DAP37 DAP 7878 9090 8484
Grey et al. 2006. Weed Technology 20:551-557
Weed Control in LL-Canola with Liberty 1.67SL (34 Weed Control in LL-Canola with Liberty 1.67SL (34 oz/A) + 21% AMS (3 lb/A)oz/A) + 21% AMS (3 lb/A)
Weed Weed TimingTiming 2001-2002’2001-2002’ 2002-2003’2002-2003’ AverageAverage
Wild Wild
radishradish
24 DAP24 DAP 5555 4141 4848
37 DAP37 DAP 5555 2525 4040
Italian Italian ryegrassryegrass
24 DAP24 DAP 6969 6060 6565
37 DAP37 DAP 7676 4545 6161
HenbitHenbit 24 DAP24 DAP 5555 6666 6161
37 DAP37 DAP 8181 5858 7070
Shepherd’s-Shepherd’s-pursepurse
24 DAP24 DAP 7979 6060 7070
37 DAP37 DAP 9999 3030 6565
Wild garlicWild garlic 24 DAP24 DAP 5555 8181 6868
37 DAP37 DAP 7474 8686 8080
Grey et al. 2006. Weed Technology 20:551-557
UGA Weed ScienceUGA Weed Sciencewww.gaweed.comwww.gaweed.com