抗性杂草的新病例及来源.pdf

1、New cases and origin of resistant weedsVijaya BhaskarTeagasc Oak ParkCharlotte MorganTeagasc Oak ParkTrinity College DublinNational Tillage Conference 2026Wednesday,28th January|Lyrath Hotel,Kilkennywww.teagasc.ie/tillagecon26 Whats behind todays weed control challenges?Continuous cereal cropping Ea

2、rlier sowing and non-inversion tillage Relying on post-emergence herbicides only Allowing seed return On-going regulatory changes New weed introductions23ALS-resistant rye brome:First confirmed caseSecond glyphosate-resistant Italian ryegrass strain4Second glyphosate-resistant Italian ryegrass strai

3、n5Summary:Grass weed resistance 6Summary:Grass weed resistance 7Summary:Grass weed resistance 8Wheres resistant wild oat coming from?(n=57)9Wheres resistant Italian ryegrass coming from?(n=50)10Wheres resistant blackgrass coming from?(n=29)1112PCA plot showing genetic dissimilarityPCA plot showing g

4、enetic similarityHow different are Irish blackgrass populations across counties?15Are Irish blackgrass different from UK?16Are Irish blackgrass different from UK?17Are Irish blackgrass different from UK?1819 Irish blackgrass is genetically similar to UK blackgrass Stay vigilant Resistance is increasing in all major tillage counties Some grass weeds may already be resistant when introduced onto farms Biosecurity&full adoption of IWM practices are essential 215,000+individual plants tested(2020-2025)2026:final year of widespread testing(EVOLVE)2027:targeted,case by case testingTake home message