Resistance of Peronospora tabacina to Metalaxyl in Texas and Mexico

Wiglesworth, M. D.; Reuveni, M.; Nesmith, William C.; Siegel, Malcolm R.; Kuć, J.; Juarez, J.

doi:10.1094/pd-72-0964

Cited by 19 publications

(5 citation statements)

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“…Blue mold disease of tobacco has been controlled mainly by applying the systemic fungicide metalaxyl (Schiltz, 1981). However, strains of P. tabacina resistant to metalaxyl have developed in several countries (Schiltz, 1981;Wiglesworth et al, 1988). It is important, therefore, to develop alternative means for controlling this disease.…”

Section: Introductionmentioning

confidence: 99%

Development of Assays for Assessing Induced Systemic Resistance by Plant Growth-Promoting Rhizobacteria against Blue Mold of Tobacco

2002

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Section: Introductionmentioning

confidence: 99%

Development of Assays for Assessing Induced Systemic Resistance by Plant Growth-Promoting Rhizobacteria against Blue Mold of Tobacco

2002

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“…Bruck et al (1982) determined that three of the fourteen isolates tested from North Carolina (USA) were resistant to metalaxyl. Isolates resistance to this fungicide were later identified from Texas (USA) in 1983 and Mexico in 1985 (Wiglesworth et al, 1988), as well as in Germany in 2002 (Krauthausen et al, 2003), and France and Italy (Zipper et al, 2009). In fact, the predictions of Lucas (1980) were accurate: the "overuse" of metalaxyl, which is a site-specific acylanaline fungicide, selected for naturally occurring resistant individuals that had temporarily become the dominant genotype in the field.…”

Section: Peronospora Tabacinamentioning

confidence: 99%

Biological Characteristics and Assessment of Virulence Diversity in Pathosystems of Economically Important Biotrophic Oomycetes

Spring

Gómez-Zeledón

Hadziabdic

et al. 2018

Critical Reviews in Plant Sciences

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Plant biotrophic oomycetes cause significant production problems and economic losses in modern agriculture and are controlled by fungicide applications and resistance breeding. However, high genetic variability and fast adaptation of the pathogens counteract these measures. As a consequence of the "arms race," new pathogen phenotypes recurrently occur and may rapidly dominate the population when selected through the pressure of control measures. Intensive monitoring with fast and reliable identification of virulence phenotypes is essential to avoid epidemics and the economic consequences in agriculture. For some of the most important downy mildews and white blister rusts, bioassay-based differentiation has been established to classify infectivity of field isolates or cultivated strains on hosts of defined resistance. However, the testing is laborious, time-consuming, logistically demanding, and prone to impreciseness. Alternatively, host independent classification could overcome these problems and enable fast assessment of the infection risk when monitoring the local pathogen population. The prerequisite would be the identification of pathogen characters correlating with the infection behavior. This review examines the current situation of bioassay-based pathotyping in six of the most important biotrophic oomycetes (Plasmopara viticola, Plasmopara halstedii, Pseudoperonospora cubensis, Peronospora tabacina, Bremia lactucae, and Albugo candida) and gives an overview on attempts and progress to identify genetic markers of the pathogens that correlate with their infection behavior.

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“…Development of resistance to metalaxyl in commercial agricultural fields or orchards has been confirmed in at least seven species of Phytophthora (Bruin and Edgington 1981;Ferrin and Kabashima 1991;Taylor et al 2002;Timmer et al 1998;Chauhan and Singh 1987;and Seemuller and Sun 1989); and in six other genera in the order Peronosporales including Pythium (Taylor et al 2002;Mazzola et al 2002;Falloon et al 2000;Wiglesworth et al 1988;Schettini et al 1991;Herzog and Schuepp 1985;Molinero-ruiz 2003;Mazzola et al 2002;White et al 1988;Cook et al 1983;Hamm et al 2004). Since the development of metalaxyl resistance is common among oomycete plant pathogens, it is important to assess the Pythium population in potato production areas where metalaxyl is used, to determine the current and future opportunity to effectively use this fungicide not only to help manage Pythium leak on potato but Pythium damping off on other crops in rotation with potato.…”

Section: Introductionmentioning

confidence: 96%

Metalaxyl-M-Resistant Pythium Species in Potato Production Areas of the Pacific Northwest of the U.S.A.

Porter¹,

Hamm

David

et al. 2009

Am. J. Pot Res

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Several Pythium species causing leak on potato are managed by the systemic fungicide metalaxyl-M. Metalaxyl-M-resistant (MR) isolates of Pythium spp. have been identified in potato production areas of the U.S.A., but information is lacking on the distribution of MR isolates in the Pacific Northwest. Soil samples from numerous fields (312) cropped to potatoes in Idaho (140), Oregon (59), and Washington (113) were assayed using metalaxyl-Mamended agar for the presence of MR isolates of Pythium in 2004 to 2006. Altogether, 1.4%, 42.4% and 32.7% of the fields from these states, respectively, were positive for MR Pythium. Isolates of Pythium ultimum that were highly resistant to metalaxyl were recovered from 53 fields representing ID, OR, and WA. Greater than 50% of the Pythium soil population consisted of MR isolates in ten of 64 fields from Oregon and Washington. Nine species of Pythium were recovered from soil samples, of which MR P. ultimum and P. spinosum were identified. Isolates of MR P. ultimum recovered from soil were pathogenic on potato tubers and may pose a serious threat to the management of Pythium leak and seed rot of diverse crops rotated with potato.Resumen Varias especies de Pythium que causan la pudrición acuosa en papa son controladas por el fungicida sistémico metalaxilo-M. Cepas de metalaxilo-M-resistente (MR) de Pythium spp. han sido identificadas en áreas de producción de papa de los Estados Unidos, pero no hay información de la distribución de cepas MR en el Pacifico Noroeste. Muestras de suelo de numerosos campos (312) cultivados con papa, en Idaho (140), Oregon (59), y Washington (113) fueron ensayadas utilizando agar metalaxilo-M-enmendado para la presencia de Pythium MR del 2004 al 2006. En total, 1.4%, 42.4% y 32.7% de los campos de estos estados, respectivamente, dieron positivo a Pythium MR. Cepas de Pythium ultimum altamente resistentes al metalaxilo fueron recuperadas de 53 campos representando a Idaho, Oregon y Washington. Más del 50% de la población de Pythium del suelo, consistió de cepas MR en 10 de los 64 campos de Oregon Am.

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Resistance of Peronospora tabacina to Metalaxyl in Texas and Mexico

Cited by 19 publications

References 0 publications

Development of Assays for Assessing Induced Systemic Resistance by Plant Growth-Promoting Rhizobacteria against Blue Mold of Tobacco

Development of Assays for Assessing Induced Systemic Resistance by Plant Growth-Promoting Rhizobacteria against Blue Mold of Tobacco

Biological Characteristics and Assessment of Virulence Diversity in Pathosystems of Economically Important Biotrophic Oomycetes

Metalaxyl-M-Resistant Pythium Species in Potato Production Areas of the Pacific Northwest of the U.S.A.

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