Occurrence of the A2 mating type ofPhytophthora infestans in potato fields in the United States and Canada

Deahl, Kenneth L.; Goth, R. W.; Young, R. J.; Sinden, S. L.; Gallegly, M. E.

doi:10.1007/bf02853803

Cited by 72 publications

(28 citation statements)

References 9 publications

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“…First, if weather conditions are unfavorable for disease development, unnecessary applications are at best inefficient, wasting both chemicals and labor and entailing extra costs (Fohner et al, 1984;Fry, 1982). Second, the repeated use of certain fungicides can lead to the emergence of late blight strains that are resistant to these fungicides (Deahl et al, 1991, Deahl et al, 1993, Fry et al, 1979, Goodwin et al, 1996. Third, the interaction among several factors influencing disease progress increases the complexity of late blight management (Small et al, 2015b).…”

Section: Methodsmentioning

confidence: 99%

Risk Management Strategies using Precision Agriculture Technology to Manage Potato Late Blight

et al. 2017

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Precision agriculture has emerged as a revolutionary technology, which transforms farming related data into useful information for agricultural decision-making. Th is paper compares precision farming technology with calendar-based approach in scheduling fungicide applications to manage potato (Solanum tuberosum L.) late blight disease. Th ree fungicide scheduling strategies were evaluated: calendar-based strategy, BlightPro decision support system based strategy (DSS-based strategy), and unsprayed control. Using results from 14 yr of computer simulation experiments for 59 locations in the United States, we constructed distributions of net return to all costs excluding fungicide cost and application cost per 0.41 ha (net return per 0.41 ha) for the calendar-based and DSS-based strategies at each location. Th ese distributions were then compared using three risk management methods: stochastic dominance, stochastic dominance with respect to a function, and stochastic effi ciency with respect to a function. Th e DSS-based strategy was identifi ed as the most eff ective approach to manage late blight in terms of disease suppression, net return per 0.41 ha, and risk-adjusted net return. Results indicate that the DSS-based strategy is the preferred method to schedule fungicide applications. Under high disease pressure circumstances, the economic benefi ts to potato growers of adopting the precision agriculture technology ranged from US$30 to $573 per 0.41 ha. For risk neutral individuals, who are concerned about the diff erence between average net return per 0.41 ha, the benefi ts ranged from $30 to $305 per 0.41 ha. Except for growers raising the moderately resistant potato cultivars, more risk averse individuals tended to benefi t more from adopting the precision agriculture technology, with benefi ts ranging from $38 to $573 per 0.41 ha. Abbreviations: AUDPC, area under disease progress curve; CE, certainty equivalent; DSS, decision support system; FSD, fi rst-degree stochastic dominance; RP, risk premium; net return per 0.41 ha, net return to all costs excluding fungicide cost and application cost per 0.41 ha; SERF, stochastic effi ciency with respect to a function; SSD, second-degree stochastic dominance; SDRF, stochastic dominance with respect to a function. Core ideas• Th e benefi ts of adopting precision farming technology was investivated in scheduling fungicide applications to manage potato late blight.• Th e precision farming technology is the preferred method to schedule fungicide applications in terms of disease suppression, net return per 0.41 ha, and risk-adjusted net return.• Th e increased adoption of the precision farming technology would help manage late blight, limit potential crop losses, and improve net returns.

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Section: Methodsmentioning

confidence: 99%

Risk Management Strategies using Precision Agriculture Technology to Manage Potato Late Blight

et al. 2017

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“…al, 1991). The last region to report the presence of mating type A2 is North America (Deahl et at., 1990). In Mexico, both mating types were found to be present in a ratio 1:1 (Gatlegly and Galindo, 1956).…”

Section: Late Blightmentioning

confidence: 97%

Recent and future developments in potato fungal pathology

Schöber

Turkensteen²

1992

Netherlands Journal of Plant Pathology

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An overview is given on the world-wide occurrence and frequency of mating type A2 of Phytophthora infestans, on ploidy levels, increased virulence and fitness of the pathogen population in Germany and the Netherlands. Experiments on the survival of oospores in the open showed that these may survive in Europe until the next growing season. The resistance reaction of the differential set of R-genes used to determine virulence of races of P. infestans is found to vary by differential clone and test method. Work has been started to come to a more homogenous differential set. The impact of oospores and the new population of P. infestans on epidemiology and hence on disease forecasting is unknown.During the past 40 years, considerable research efforts have been made to reveal the biochemical pathways of pathogenesis, compatibility and incompatibility of the host-pathogen reaction of P. infestans. However, the questions about host-pathogen recognition, the genes involved and which chemical compounds cause hypersensitivity or durable resistance, have not been answered yet. It is expected that the modem molecular biological approaches will more rapidly lead to such answers. One of such approaches, RFLP fingerprinting, indicated a total replacement of the old European population of P. infestans by a new one, and revealed the origin of Mendelian aberrations found to be due to selfing when crossing isolates.The world-wide occurrence ofPhoma exigua var.foveata, the causal organism of gangrene, is discussed and a clue on its possible origin and time of introduction in Europe is given. Soil infestation is a minor but persistent source of infection and impedes elimination of the pathogen. Green-cropharvesting, a new vine killing method, considerably reduced the level of black scurf caused byRhizoctonia solani and of gangrene as compared to other vine killing methods. Promising results have been obtained combining green-crop-harvesting and the application of antagonistic organisms in controlling black scurf and Erwinia spp. Integrated control of dry rot and gangrene seems to have a better future than the use of systemic fungicides.

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“…The récent influx of A2 mating types of P. infestans into Europe (Drenth et al 1993), the United States (Deahl et al 1991;Goodwin étal. 1995) and Canada (Chycoski and Punja 1996;Deahl et al 1991;Peters et al 1999aPeters et al , 1999b) predicated a need to détermine the survival capacity and infectivity of asexual propagules of new populations of this pathogen.…”

Section: Phytoprotection 81: 123-128mentioning

confidence: 99%

“…1995) and Canada (Chycoski and Punja 1996;Deahl et al 1991;Peters et al 1999aPeters et al , 1999b) predicated a need to détermine the survival capacity and infectivity of asexual propagules of new populations of this pathogen. Isolâtes of thetraditional US-1 (A1) and new US-8 (A2) génotypes were selected to represent récent (1994) populations occurring in Canada.…”

Section: Phytoprotection 81: 123-128mentioning

confidence: 99%

Infectivity of asexual propagules of Phytophtora infestans in sterile peat exposed to various temperature regimes

Peters¹,

Platt²,

Hall³

2005

phyto

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Occurrence of the A2 mating type ofPhytophthora infestans in potato fields in the United States and Canada

Cited by 72 publications

References 9 publications

Risk Management Strategies using Precision Agriculture Technology to Manage Potato Late Blight

Risk Management Strategies using Precision Agriculture Technology to Manage Potato Late Blight

Recent and future developments in potato fungal pathology

Infectivity of asexual propagules of Phytophtora infestans in sterile peat exposed to various temperature regimes

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