Pajic, V.

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PPO inhibitors as new herbicides in lentil production

University of Saskatchewan Research Archive

PPO inhibitors as new herbicides in lentil production Vladimir PajicLentils in Saskatchewan▪ 95% of Canadian lentil production▪ World leading exporter since 1995▪ Lentil very poor competitor▪ Weeds cause up to 17% yield losses 00.511.522.52010 2011 2012 2013 2014Million metric tonnesLentil production in Saskatchewan (2010-2014) Source: CanStatPPO inhibitors▪ Group 14 herbicides ▪ Protoporphyrinogen IX oxidase (PPOX)▪ “Light requirement”  ▪ Low number of resistant weeds▪ Focus on sulfentrazone (Authority®) and Fluthiacet-methyl (Cadet®)Source : http://grist.org/Sulfentrazone▪ Soil applied, pre-emergent herbicide▪ Activity depends on soil pH and organic mater▪ Registered crops  Chickpeas;Garbanzo Beans; Field Pea; Soybeans; Sunflowers; Flax▪ Recroping restriction for lentil - 24 months (revised 2014)▪ Controls: Kochia, Lamb’s quarters, Wild buckwheat and Redroot PigweedSulfentrazoneCourtesy of Eric Johnson  Effects of sulfentrazone on lentil0102030405060708090Rate of injury on scale 0-100Injury rating after 280gai/ha of Sulfentrazone at Saskatoon (2011)42 DAT55 DAT67 DAT020406080100Yield (percent of untreated control)Yield data for Saskatoon and Scott (2011-2012) Sulfentrazone 140gai/ha Sulfentrazone 280gai/haTwo year study (2011, 2012) in two locations (Saskatoon and Scott)0.0010.0020.0030.0040.0050.0060.0070.0080.0090.00100.0016h dark 12h light/16h dark 24h light/16h dark 36h light/16h dark 48h light/16h dark% of electrolyte leakage ELA of seven lentil varieties with 100 µM concentration of SulfentrazoneRedberrySedleyImproveKR1MaximRosetownImpalaElectrolyte leakage assay (ELA)Fluthiacet-methyl ▪ Not registered in Canada▪ Foliar applied, post-emergence herbicide▪ In USA registered crops:Corn and soybeanControls : Kochia, Waterhemp, Lamb’s quarters, Wild buckwheat, Velvetleaf, Pigweed, etc.Effects of Fluthiacet-methyl on lentil051015202530354045Rate of injury on scale 0-100Injury rating after 8gai/ha of Fluthiacet-methyl at Saskatoon (2011)7 DAT20 DAT32 DAT020406080100120Yield (percent of untreated control)Yield data for Saskatoon and Scott (2011-2012) Fluthiacet-methyl 4gai/ha Fluthiacet-methyl 8gai/haTwo year study (2011, 2012) in two locations (Saskatoon and Scott)Dose response studyRosetown: GR50 = 1.7gai/haImprove: GR50 = 32 gai/haFluthiacet-methyl rates: 0, 0.5, 1, 2, 4, 8, 16, 32, 64 and 128 gai/haRate of Fluthiacet-methyl (gai/ha )Dry biomass (g)Current work• Screening diverse lentil germplasmand validating selectionsConclusion▪ Genetic diversity to the effects of PPO inhibitors exist in lentil germplasm▪ The next step is understanding genetics which controls lentils response to PPO inhibitors ▪ The goal is to provide essential tools and knowledge to the breeders which will lead to development of PPO tolerant lentil varieties▪ PPO inhibitors will be part of lentil weed management strategies in near futureAcknowledgementsProf Kirstin BettProf Christian WillenborgProf Albert VandenbergEric Johnson Ken SapsfordField lab crewQuestions?

https://harvest.usask.ca/bitstream/10388/8916/1/V.%20Pajic%2c%202015.pdf

PPO inhibitors as new herbicides in lentil production

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