TOP CROP MANAGER
SPRAY TIMING FOR PASMO
Finding the best fungicides and timing for flax crops
PG. 3
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Fungicide Guide 2018
PHOTO COURTESY OF TRISHA ISLAM.
Top Crop Manager thanks BASF for sponsoring this year’s Fungicide Guide.
SPRAY TIMING FOR PASMO CONTROL
New research identifies the best fungicides and application timings for flax crops.
by Bruce Barker
BAssociate Editor: Jannen Belbeck
Western Field Editor: Bruce Barker
National Account Managers: Danielle Labrie and Michelle Allison
Group Publisher: Diane Kleer
Canada’s
or
uilding off several research studies over the last decade, research scientist Cecil Vera at Agriculture and Agri-Food Canada (AAFC) in Melfort, Sask., wanted to narrow down the fungicide application window for control of pasmo disease in flax and investigate the effectiveness of fungicides in reducing the impacts of the disease. Graduate student Tonima (Trisha) Islam summarized the results of the three-year study that ran from 2014 through 2016 under the supervision of Randy Kutcher, an associate professor in the department of plant sciences at the University of Saskatchewan.
The research compared three fungicides and three application timings to measure the effect of pasmo disease severity, crop maturity, seed yield, thousand seed weight and test weight of CDC Bethune flax. Trial locations were in Vegreville, Alta., Melfort and Saskatoon, Sask., and Brandon, Man. The fungicides Headline EC (pyraclostrobin), Priaxor (pyraclostrobin and fluxapyroxad) and Xemium (fluxapyroxad) were applied; currently only Headline and Priaxor are registered on flax for control of pasmo.
ABOVE: Pasmo results in defoliation and weakening of the stems, leading to stem breakage and lodging.
PHOTO COURTESY OF TRISHA ISLAM.
FUNGICIDES 2018
AND OTHER CROPS
SPRAY TIMING FOR PASMO CONTROL
Continued from page 3
Fungicide application timing was at early flower (BBCH 61) and mid-flower (BBCH 65), and a dual application was made at both early and mid-flower. Applications were compared to a control without fungicide application.
Islam found all fungicides reduced disease severity, but Xemium was the least effective. With respect to timing, fungicide application at the early stage was the least effective. There was no difference in disease severity between the midflower application stage and the dual fungicide application.
Priaxor increased seed yield approximately 25 per cent (2,295 kilograms per hectare, or kg/ha) compared to the control (1,822 kg/ha), followed by Headline at 19 per cent (2,172 kg/ha) and Xemium at 18 per cent (2,159 kg/ha). No significant difference was observed between Headline and Xemium.
However, the Priaxor treatment and the dual fungicide application delayed maturity by five days, which could present a risk to seed quality in some years. This delay in maturity may be a result of the effectiveness of the fungicide treatment – pasmo often results in premature ripening and earlier harvests. Earlier seeding may help to offset this.
Regarding application and the impact on seed yield, applying fungicide at both the early and mid-flower stages
increased seed yield approximately 25 per cent (2,273 kg/ ha) compared to the control (1,822 kg/ha), followed by midflower timing at 21 per cent (2,210 kg/ha) and early flower timing at 17 per cent (2,143 kg/ha). Yield at the mid-flower application timing was not significantly different from either the dual application or the early flower application, but there was a significant difference between early and dual timings.
In terms of thousand seed weight and test weight –proxies for seed quality – the mid-flower and dual treatment increased thousand kernel weight and test weight.
Even though the dual application provided the highest yield, economically, the net return on a second application may not make sense.
Making the application decision
“Usually, conditions for pasmo infection differ from year to year and from location to location. I think the best strategy would be to protect the crop with the best and most economical recommendations and hope for good results,” Vera says.
This means a farmer should base their decision to spray a fungicide on environmental conditions coupled with previous experience with pasmo, flax frequency in the rotation and proximity to adjacent flax stubble.
Two things made us #1: Advanced science and advanced growers.
Recognized as the Canadian leader in pulse fungicides1, Priaxor® combines two powerful active ingredients for disease control. The unique mobility of Xemium® provides more consistent and continuous disease control, while pyraclostrobin delivers the benefits2 of AgCelence®, including increased growth efficiency, better management of stress and greater yield potential3. Of course, forward-thinking growers also had a hand in making Priaxor fungicide a success. Why not let its advanced chemistry do the same for you? Visit agsolutions.ca/priaxor to learn more.
1 Based on AgData brand-use reports in Western Canada, 2015-2017.
2 AgCelence benefits refer to products containing the active ingredient pyraclostrobin. 3All comparisons are to untreated, unless otherwise stated. Always read and follow label directions.
is
FUNGICIDES 2018
CEREALS
(mancozeb)
(fluxapyroxad, pyraclostrobin, propiconazole)
FUNGICIDES 2018
OILSEED AND PULSE CROPS
FIELD PEA
Mould
Soybean Rust
Leaf Spot
Powdery Mildew
White Mould
Asian Soybean Rust
Bacterial Blight
Botrytis Gray Mould Downy Mildew
Powdery Mildew
Uromyces (Rust)
Sclerotinia White Mould
Ascochyta Blight
Asian Soybean Rust
Botrytis Gray Mould
Sclerotinia White Mould
Fababean
Ascochyta Blight
Asian Soybean Rust
Powdery Mildew
Sclerotinia White Mould
Ascochyta Blight
Asian Soybean Rust
Botrytis Gray Mould
Sclerotinia White Mould
Ascochyta Blight
Asian Soybean Rust
Botrytis Gray Mould
Mycosphaerella Blight
Powdery Mildew
Sclerotinia White Mould
(pyraclostrobin)
(copper hydroxide)
(sulphur)
(boscalid)
(boscalid, pyraclostrobin)
(mancozeb)
(pyraclostrobin, fluxapyroxad, propiconazole)
(iprodione)
(copper hydroxide)
(mancozeb)
(propiconazole)
(fluxapyroxad, pyraclostrobin)
(fluxapyroxad, pyraclostrobin)
(prothioconazole)
(propiconazole)
(propiconazole)
(fluopyram, prothioconazole)
(azoxystrobin)
(metconazole)
(azoxystrobin, propiconazole)
FUNGICIDES 2018
POTATOES
Aprovia Top 7, 3
difenoconazole
Azoshy 250 SC 11 azoxystrobin
Bravo Zn M chlorothalonil
Cabrio Plus 11, M2 pyraclostrobin, metiram
Cantus 7 boscalid
Contans (bio-fungicide) N/C Coniothyrium minitans strain
Copper 53W M copper sulphate
Copper Spray M copper oxychloride
Curzate 60 DF 27, M3 cymoxanil
Dithane DG Rainshield M mancozeb
Elatus 11, 7 azoxystrobin, benzovindiflupyr
Elixir
chlorothalonil, mancozeb
Gavel 75 DF 22, M3 mancozeb, zoxamide
Manzate Products - 200, 75DF, Pro-stick
pyrimethanil
Orondis Ultra 40, 49 mandipropamid, oxathiapiprolin
Parasol Products - DP, WP, Flowable, WG M copper hydroxide
Penncozeb 75DF Raincoat M mancozeb
DF
Tanos 50 DF 11, 27
Tattoo C 28, M propamocarb HCl, chlorothalonil
A funny thing happens when you use a leader. You become one.
New Nexicor™ fungicide delivers broad-spectrum disease control with multiple modes of action to manage resistance. It also builds on the benefits1 of AgCelence®, for increased growth efficiency, better management of minor stress and greater yield potential.2 Nexicor is the only leaf-disease fungicide that offers these benefits, ensuring cereals play a bigger role in maximizing your operation’s total profits. Details at agsolutions.ca/nexicor
1 AgCelence benefits refer to products that contain the active ingredient pyraclostrobin.
2 All comparisons are to untreated unless stated otherwise. Always read and follow label directions. AgSolutions is a registered trade-mark of BASF Corporation; NEXICOR is a trade-mark, and AgCelence and XEMIUM are registered trade-marks of BASF SE; all
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1 All comparisons are to untreated, unless otherwise stated. Always read and follow label directions. AgSolutions