Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study

To study the over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central Valley (CCV), temperature records from various locations in the CCV during the period 1950-2009 were examined for the occurrence of lethal maximum temperatures for the uredinia and uredini...

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Autor principal:	Tollenaar,Huib
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2012
Materias:	Yellow rust epidemiology lethal temperature Triticum aestivum
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400005
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spelling	oai:scielo:S0718-583920120004000052018-10-01Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case studyTollenaar,Huib Yellow rust epidemiology lethal temperature Triticum aestivum To study the over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central Valley (CCV), temperature records from various locations in the CCV during the period 1950-2009 were examined for the occurrence of lethal maximum temperatures for the uredinia and uredinio-mycelium of this fungus. The lethal upper threshold temperature for the uredinial stage of P.s. tritici, estimated to be 40.5 °C on the basis of data published elsewhere, and the sum, accumulated during ten consecutive days, of the respective lethal temperature quotients (ALTQio), accounting for the partial lethal effect of the daily ambient temperatures between 30 and 40.5 °C on the uredinial stage of P.s. tritici, were used as yardsticks for thermal lethality. The results indicate that, in these 60 yr, the uredinia and the uredinio-mycelium of P.s. tritici could not possibly have over-summered at any of the locations studied. The Sierra Nevada Mountains, together with the Tulelake Basin and the coastal zone of the Pacific Ocean are the only two areas in California with appropriate environmental conditions for the summer-survival of the uredinial stage of stripe rust. Therefore, it is presumed that the inoculum for the initial infections of P.s. tritici in wheat fields in the CCV during the following growing season originates in either one or both of these areas, although, a potential third source of inoculum for the initial infections of stripe rust in the CCV could also be involved. Namely, the possible presence of telia with viable teliospores of P.s. tritici in autumn on straw of the threshed wheat fields or on volunteer wheat plants in the CCV, in conjunction with the accidental concurrence of nearby stripe rust susceptible barberry (Berberis spp.), could lead to the development of alternative, endogenous sources of inoculum in the CCV.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.72 n.4 20122012-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400005en10.4067/S0718-58392012000400005
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Yellow rust epidemiology lethal temperature Triticum aestivum
spellingShingle	Yellow rust epidemiology lethal temperature Triticum aestivum Tollenaar,Huib Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
description	To study the over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central Valley (CCV), temperature records from various locations in the CCV during the period 1950-2009 were examined for the occurrence of lethal maximum temperatures for the uredinia and uredinio-mycelium of this fungus. The lethal upper threshold temperature for the uredinial stage of P.s. tritici, estimated to be 40.5 °C on the basis of data published elsewhere, and the sum, accumulated during ten consecutive days, of the respective lethal temperature quotients (ALTQio), accounting for the partial lethal effect of the daily ambient temperatures between 30 and 40.5 °C on the uredinial stage of P.s. tritici, were used as yardsticks for thermal lethality. The results indicate that, in these 60 yr, the uredinia and the uredinio-mycelium of P.s. tritici could not possibly have over-summered at any of the locations studied. The Sierra Nevada Mountains, together with the Tulelake Basin and the coastal zone of the Pacific Ocean are the only two areas in California with appropriate environmental conditions for the summer-survival of the uredinial stage of stripe rust. Therefore, it is presumed that the inoculum for the initial infections of P.s. tritici in wheat fields in the CCV during the following growing season originates in either one or both of these areas, although, a potential third source of inoculum for the initial infections of stripe rust in the CCV could also be involved. Namely, the possible presence of telia with viable teliospores of P.s. tritici in autumn on straw of the threshed wheat fields or on volunteer wheat plants in the CCV, in conjunction with the accidental concurrence of nearby stripe rust susceptible barberry (Berberis spp.), could lead to the development of alternative, endogenous sources of inoculum in the CCV.
author	Tollenaar,Huib
author_facet	Tollenaar,Huib
author_sort	Tollenaar,Huib
title	Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
title_short	Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
title_full	Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
title_fullStr	Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
title_full_unstemmed	Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study
title_sort	over-summering of wheat stripe rust (puccinia striiformis f.sp. tritici) in the california central valley: a case study
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2012
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400005
work_keys_str_mv	AT tollenaarhuib oversummeringofwheatstriperustpucciniastriiformisfsptriticiinthecaliforniacentralvalleyacasestudy
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Over-summering of wheat stripe rust (Puccinia striiformis f.sp. tritici) in the California Central valley: A case study

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