除草剂抗性管理：地肤和新兴苋菜的威胁.pdf

1、Herbicide Resistance:Kochia and Emerging Pigweed ThreatsShaun M.SharpeResearch Scientist Agriculture and Agri-Food CanadaSaskatoon Research and Development CentreTop Crop Summit-February 26,2026 Kochia patches typically are marginal,not the whole field.Only treat kochia where its found.Kochia soil s

2、eedbank:typically,three years.Intensive management over short term.3Patch Management6 Treatments Non-treated Mowing AC Saltlander Black Plastic Hydro-Mulch Chaff4Patch Management5Mulch Depths62021 Field Season-Kochia72022 Field Season-Kochia82023 Field Season-Kochia9TreatmentKochia control(%of nontr

3、eated)202120222023Plastic mulch100%100%100%Chaff86-95%78-95%44-78%Coco mulch72-84%27-63%36-78%Mowing54-93%39-74%47-98%Overall Kochia Control(Seasonal and Yearly)10 Ecological forecasting experiment What happens in the future?3 Runs(2019-2022)2-Factor Factorial Carfentrazone-ethyl(Yes/No)Growth stage

4、(3 to 4)via seeding dates11MethodologyPre-Spray Height Leaf No.Branch No.12Post-Spray Damage 1,2,and 4 weeks Height Leaves Branches Reproductive organs(Yes/No)MeasurementsKochia height resultsKochia branching resultsKochia biomass resultsSublethal dosing exposure risk(SLDER)Influenced by:Standardize

5、d final plant height Standardized final branch number Overall herbicide tolerance Standardized aboveground biomass Immediate reproductive potential(flowering)Prairie Invasive Pigweed BiovigilanceEffect of Crop Selection and Seeding Rates on Amaranth EstablishmentCropDays to emerg.June height(cm)July

6、 height(cm)August height(cm)Crop biomass(kg/ha)Barley14 b18 a53 b54 c4324 bcCanola16 ab6 c77 a89 a3284 cLentil14 b9 bc37 c46 c7594 bPeas21 a13 b69 a91 a11270 aWheat19 ab19 a55 b64 b4958 bcTrt.No.Factor 1(Crop)Factor 2(Rate)August amaranth h