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Tomato and Pepper Scout Training
Weed Control in Tomatoes and Peppers
Darren Robinson
Dual+Sencor (PPI)
Advantages
Single application
Residual grass and broadleaf control including EBN
Weaknesses
Can set back transplants – low OM
Triazine tolerant weeds escape
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Dual injury on tomatoesDual injury on tomatoesSikkema RCSikkema RC
Sencor injury on tomatoesSencor injury on tomatoesSikkema RCSikkema RC
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Treflan+Dual+Sencor
Advantages
Residual broadleaf control
Control of triazine tolerant lambsquarters*
Weaknesses
Can set back transplants – shallow planting
Less residual control of EBN
Untreated checkTreflan (0.84 L/ac) + Dual (0.5 L/ac)
+ Sencor (0.4 L/ac) Robinson RCRobinson RC
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Treflan
injury on
tomatoes
Treflan
injury on
tomatoes
Sikkema RCSikkema RC
0 10 20 30 40
4 in
2 in
1 in
0.5 in
Yield loss (% of 4 Inch Depth)
Yield
Yield loss caused by Treflan + Dual Magnum + Sencor (PPI) increased as transplanting depth decreased
Sikkema, RC
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Dual/Sencor PPI + Sencor POST
Advantages
Improvement in broadleaf control –velvetleaf
Reduced chance of crop injury
Weaknesses
No control of triazine-resistant lambsquarters
Requires 4 or 5 applications
Dual (0.7 L/ac) + Sencor (0.2 L/ac) PPI + Sencor (0.12 L/ac) * 3 POST
Robinson RCRobinson RC
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Weed size at time of micro-rate applicationsRobinson RCRobinson RC
0 20 40 60 80 100
velvetleaf
lamb's-quarters
EBnightshade
redrootpigweed
Dual + Sencor; 3SencorDual + Sencor
Treflan + Dual +Sencor
Comparison of herbicide programs
Robinson RCRobinson RC
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Summary
Excellent control of broadleaf weeds
Dual+Sencor PPI fb Sencor
Dual+Sencor and Treflan+Sencor provide less consistent control of the spectrum of common broadleaf weeds found in SW Ontario.
Common lambsquarters
Bouchard and Neron, 1999Bouchard and Neron, 1999
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Common ragweed
Bouchard and Neron, 1999Bouchard and Neron, 1999
Velvetleaf
Bouchard and Neron, 1999Bouchard and Neron, 1999
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Redroot pigweed
Bouchard and Neron, 1999Bouchard and Neron, 1999
Eastern
black
nightshade
Bouchard and Neron, 1999Bouchard and Neron, 1999
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Hairy
nightshade
Bouchard and Neron, 1999Bouchard and Neron, 1999
Maximum size of hairy nightshade for Prism control
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Relative germination intervals
Lambsquarters
Common ragweed
Velvetleaf
Redroot pigweed
Eastern black nightshade
Hairy nightshade
late April to late June
early May to June
mid-May to July
Postemergence broadleaf herbicides
Sencor
General broadleaf control
Pinnacle
Triazine-tolerant weeds (lambsquarters, pigweed)
Prism
Hairy nightshade
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Pinnacle MetribuzinSikkema RCSikkema RC
Pinnacle injury on tomatoesPinnacle injury on tomatoesRobinson RCRobinson RC
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Observations on Pinnacle
3.2 g/ac; applied 21 days POST-transplant
Triazine-tolerant weeds
Not registered as tank mix with Sencor
Injury more likely
If applied when temps >32oC
Frost-injured plants
Varietal sensitivity (eg. N1069, H9909)
Pinnacle 3.2 g/ac – H9553Robinson RCRobinson RC
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Pinnacle 3.2 g/ac – H9553Robinson RCRobinson RC
Prism injury on tomatoesPrism injury on tomatoesRobinson RCRobinson RC
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Problem grass weeds in tomatoes and peppers
Large and smooth crabgrass
Foxtails – yellow, giant, green
Fall panicum
Smooth crabgrass
Large crabgrass
Bouchard and Neron, 1999Bouchard and Neron, 1999
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Yellow foxtail
Bouchard and Neron, 1999Bouchard and Neron, 1999
Giant
Foxtail
Green
foxtail
Bouchard and Neron, 1999Bouchard and Neron, 1999
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Fall panicum
Green foxtail vs. Fall panicum
Hairs along margins of leaf sheath in green foxtail
Hairs not present in fall panicum
LOOKS VERY SIMILAR TO FALL PANICUM WHEN YOUNG!!!
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Annual Grass Control
50 60 70 80 90 100
Poast Ultra
Venture L
Excel Super
Weed Control (%)Yellow, giant, green foxtailBarnyardgrass, witchgrass, fall panicum
ECW, 1994-1999ECW, 1994-1999
Control of annual grasses with PrismControl of annual grasses with PrismSikkema RCSikkema RC
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Annual grass control with Prism
0 20 40 60 80 100
Yellow Foxtail
Green Foxtail
Fall Panicum
Witchgrass
Barnyard Grass
Large Crabgrass
Smooth Crabgrass
% weed controlECW, 1994-1999ECW, 1994-1999
Weed Control in Peppers
Treflan – annual grasses, chickweed, PW, LQ
Devrinol – some broadleaf suppression
Dual II Magnum – annual grasses, some broadleaf control (pigweed, EBN, lambsquarters)
Command – eastern black nightshade, annual grasses (weak on pigweed)
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Dual (0.5 L/ac) Dual+Devrinol
(0.5 L/ac + 1.8 kg/ac)O’Sullivan, SimcoeO’Sullivan, Simcoe
Dual+Dacthal untreated
(0.5 L/ac + 6.2 kg/ac) O’Sullivan, SimcoeO’Sullivan, Simcoe
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Sikkema RCSikkema RC
WSSA WebsiteWSSA Website
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Spray drift injury in vegetables
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Robinson RCRobinson RC
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Banvel drift in tomatoesWSSA WebsiteWSSA Website
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Injury symptoms PPI/PRE: http://www.omafra.gov.on.ca/english/crops/facts/info_herbicide2.htm
Injury symptoms POST:http://www.omafra.gov.on.ca/english/crops/facts/info_herbicide.htm
Herbicide efficacy:http://www.omafra.gov.on.ca/english/crops/facts/info_broadleaf.htm
This presentation:http://www.ridgetownc.com/research/documents/robinson_IPM_scouting_meeting_april.pdf
Darren Robinson
(519) 674-1604
Some resources: