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ARS Home » Southeast Area » Byron, Georgia » Fruit and Tree Nut Research » Research » Publications at this Location » Publication #320714
Title: Weather conditions conducive to infection of winter wheat by Puccinia striiformis sp. tritici race ‘warrior’

Author
item EL JARROUDI, MOUSSA - University Of Liege
item KOUADIO, AMANI - University Of Southern Queensland
item EL JARROUDI, M. - Université Abdelmalek Essaâdi
item Bock, Clive
item TYCHON, BERNARD - University Of Liege
item JUNK, JURGEN - Luxembourg Institute Of Science & Technology
item DELFOSSE, PHILIPPE - Centre De Recherche Public - Gabriel Lippmann

Submitted to: American Phytopathology Society
Publication Type: Abstract Only
Publication Acceptance Date: 5/8/2015
Publication Date: 11/1/2015
Citation: El Jarroudi, M., Kouadio, A., El Jarroudi, M., Bock, C.H., Tychon, B., Junk, J., Delfosse, P. 2015. Weather conditions conducive to infection of winter wheat by Puccinia striiformis sp. tritici race ‘warrior’. American Phytopathology Society. 105(Suppl. 4):S4.40.

Interpretive Summary: Abstract only. JLR

Technical Abstract: Wheat stripe rust (WSR) (caused by Puccinia striiformis sp. tritici) i continues to be a major threat in most wheat growing regions of the world, with potential to inflict regular yield losses where susceptible cultivars are grown and when weather conditions are favourable. A recently isolated strain of P. striiformis sp. tritici, ‘warrior’, first identified in 2011 in Europe, is now virulent on adult plants of susceptible wheat cultivars throughout most wheat growing regions, including Luxembourg. Daily weather conditions were monitored and related to development of WSR during the 2012-2014 seasons 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 a combination of weather conditions, including relative humidity >92% for =4 hours and air temperatures of 4°C to 16°C for =36 hours are necessary for WSR development, assuming inoculum is available. Furthermore, comparisons with reported WSR 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.