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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


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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


Velvetleaf


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Redroot pigweed


Eastern

black

nightshade


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Hairy

nightshade


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


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Yellow foxtail


Giant

Foxtail

Green

foxtail


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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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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

[email protected]

(519) 674-1604

Some resources:

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