Weather conditions conducive to infection of winter wheat by Puccinia striiformis sp. tritici race ‘warrior’

El Jarroudi, Moussa and Kouadio, Louis ORCID: https://orcid.org/0000-0001-9669-7807 and El Jarroudi, Mustapha and Bock, Clive H. and Tychon, Bernard and Junk, Jurgen and Delfosse, Philippe (2015) Weather conditions conducive to infection of winter wheat by Puccinia striiformis sp. tritici race ‘warrior’. In: 2015 APS Annual Meeting, 1-5 Aug 2015, Pasadena, CA, U.S.A..


Abstract

Wheat stripe rust (WSR) (caused by Puccinia striiformis sp. tritici) continues to be a major threat in most wheat growing regions of the world, with potential to inflict regular yield losses when susceptible cultivars are grown and weather conditions are favourable. A recent isolated strain of P. striiformis sp. tritici, warrior, first identified in 2011 in Europe, is now virulent on adult plants of susceptible wheat cultivars across most of wheat growing regions, including Luxembourg. Daily weather conditions were monitored and related to development of WSR during the 2012-2014 period in Luxembourg. Favourable weather conditions were determined by (i) analysing Dennis model outputs generated through a Monte Carlo method, and (ii) identifying the best correlation between the frequencies of weather condition classes and the area under the disease progress curve on the uppermost three leaves (L1, L2, and L3; L1 being the flag leaf). Our results showed that combined weather conditions, including relative humidity >92% for ≥4 hours and air temperatures between 4°C and 16°C for ≥36 hours are necessary for WLR development, assuming inoculum is available. Furthermore, comparisons with reported WLR outbreaks in previous years showed that in recent years the disease is occurring at earlier stages in the growing season, suggesting a likely effect of climate change and/or climate variability.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Poster)
Refereed: No
Item Status: Live Archive
Additional Information: Abstract only.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 15 Jun 2021 06:02
Last Modified: 13 Jul 2021 03:23
Uncontrolled Keywords: weather; wheat stripe rust
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0703 Crop and Pasture Production > 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3004 Crop and pasture production > 300409 Crop and pasture protection (incl. pests, diseases and weeds)
Identification Number or DOI: https://doi.org/10.1094/PHYTO-105-11-S4.1
URI: http://eprints.usq.edu.au/id/eprint/42211

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