小麦的两种可怕病害（条锈病和细菌性叶斑病）同时发生.pdf

1、www.usask.caManaging stripe rust&bacterial leaf streak(BLS)A Gruesome TwosomeTop Crop Manager Summit,Saskatoon Inn&Conference CentreFebruary 26th,2026Randy Kutcher,Crop Development Centre,Dept Plant Sciences,USask;G.Brar,K.Lou,J.T.Vera,K.Glor&K.Nabetani;and Valentina Anastasini,MSc,Crop Development

2、Centre,Dept Plant Sciences,USaskBit of background on the disease Has become frequently identified on the prairies Puccinia striiformis f.sp.tritici(Pst)-wheat P.striiformis f.sp.hordei(Psh)-barley Adapted to cooler temperatures than stem and leaf rust,but warmer temperatures than it tolerated previo

3、uslyOptimum temperature:11-23C days,8-15C nightsManagement options Eradicate the alternate host Grow genetically resistance varieties Use fungicide when warranted Crop rotation,tillage,stubble-burning,pathogen-free seed Have NO Effect,same as for stem and leaf rustAll stage resistance(ASR)aka seedli

4、ng resistanceAdult plant resistance(APR),susceptible at seedling stage,resistance develops as plant matures,usually expressed by boot stage.Host resistance of two types:Gene-for-gene interaction where an R-gene in the wheat variety recognizes a particular avirulence gene in the pathogen and mounts a

5、 defense Often a single gene can be very effective,but short-lived as unfortunately this puts great selection pressure on the pathogen;resistance breakdown frequentAll stage resistance(ASR)DifferentialYr-R geneDifferentialYr-R geneAvocet-Ssusceptible Avocet-Yr18Yr18(APR*)Avocet+YrAYrAAvocet-Yr24Yr24

6、Avocet-Yr1Yr1Avocet-Y26Yr26Avocet-Yr2Yr2Avocet-Yr27Yr27Avocet-Yr5Yr5Avocet-YrSPYrSPAvocet-Yr6Yr6Avocet-Yr28Yr28Avocet-Yr7Yr7Avocet-Yr29Yr29(APR)Avocet-Yr8Yr8Avocet-Yr31Yr31Avocet-Yr9Yr9Avocet-Yr32Yr32Avocet-Yr10Yr10YamhillYr2,Yr4a,YrYamAvocet-Yr15Yr15MoroYr10,YrMorAvocet-Yr17Yr17PahaYrPa1,YrPa2,YrPa