Soil fumigation and crop rotation to control spraing disease in potatoes

Maas, P. W. T.

doi:10.1007/bf01976805

Cited by 10 publications

(8 citation statements)

References 4 publications

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“…The results were not conclusive but indicated an increase of spraing after spring barley as the preceding crop, related also to an increase in the density of trichodorid nematodes; spraing frequency and trichodorid densities were lowest after carrots. Maas (1975) observed lower disease incidence after spring barley, and French & Wilson (1976) reported a similar decline with an increase in the number of barley crops grown in the 3 years preceding potato. Barley was also reported as a good host for trichodorids by Kegler et al (1984).…”

Section: Introductionmentioning

confidence: 72%

“…Also Richter (1968) and Kegler et al (1 984) reported increased spraing after spring barley, while Maas (1975) andFrench &Wilson (1976) found the opposite correlation. On the other hand, in the study of accumulated effects from 5 years ofpreceding crops, a possible spraing increase was noted with increasing numbers of potato and barley crops, respectively.…”

Section: Discussionmentioning

confidence: 96%

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Cultivation factors influencing spraing in potato‐a statistical analysis

Loevgren

Eriksson

1989

EPPO Bulletin

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In an attempt to study the effects of cultivation factors on the incidence of spraing in potato, on the presence of tobacco rattle tobravirus (TRV) and potato mop‐top furovirus (PMTV), and on the densities of trichodorid nematodes in field soils, a statistical analysis was conducted based on field records provided by a Swedish potato crisp industry. The factors studied were crop rotation, precipitation (irrigation inclusive), planting time, fertilization, plant‐available P, K and B, soil texture and soil pH. The data were collected for 1979‐1987, representing 50 farms (198 fields) in southern Sweden. A correlation was found between TRV infectivity in the autumn and planting time of the potato crop. Thus, late planting was correlated with lower frequency of TRV. By ANOVA test of 5 years of preceding crops, a possible spraing increase was indicated when numbers of potato or barley crops increased in the crop rotations. A possible spraing decrease was indicated when the share of wheat increased. High incidence of spraing, and high densities of trichodorid nematodes, were both correlated with low values of plant‐available potassium, KAL, in soil.

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Section: Introductionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 96%

Cultivation factors influencing spraing in potato‐a statistical analysis

Loevgren

Eriksson

1989

EPPO Bulletin

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“…Brown et al (2000) demonstrated that resistance is not correlated with suitability of the potato genotype as host to the stubby-root nematode vector, Paratrichodorus allius, in the Pacific Northwest of the US, suggesting that resistance to TRV per se is the main component of resistance. Maas (1975) and Brown et al (2000) found that some genotypes were resistant in one infested field, but not another, implying a differential response to TRV isolates. Dale and Solomon (1988b) and Dale (1989) studied the inheritance based on a diallel mating design.…”

Section: Vectormentioning

confidence: 95%

Characterization of Resistance to Corky Ringspot Disease in Potato: A Case for Resistance to Infection by Tobacco Rattle Virus

et al. 2009

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Corky ringspot disease (spraing) is incited by the tobacco rattle virus (TRV) transmitted by stubby root nematode (Paratrichodorus spp.). The resulting damage consists of internal and skin surface necrotic blemishes which render the tubers unmarketable. Resistance to the disease has been extensively documented in breeding programs. High levels of resistance are known for a number of varieties and breeding lines. Because tubers that are symptomless but virus infected have been documented, the nature of resistance is a point of debate. In two field locations where a total of 1,259 tubers of resistant breeding lines were RT-PCR tested, 5.6 and 2.0% of symptomless tubers gave positive PCR tests in the different fields. Nearly all of these were from three clones that would have been classified as susceptible by symptoms in later testing. Taken as a whole 58% of the symptomatic tubers gave positive PCR tests. Standard commercial susceptible cultivars showed 34% symptomless tubers with positive PCR results. We have shown here that tubers of most resistant lines are not positive for the virus when asymptomatic tubers are tested by RT-PCR, while symptomatic tubers are mostly positive. Within selected resistant materials, clones with the highest level of asymptomatic positives also showed susceptible responses as assessed by visual ranking in later tests. Although RT-PCR fails to amplify from symptomatic tubers in some cases, the results of this study suggest that most resistant breeding lines do not test positive as latent carriers of the virus. Therefore, lack of symptoms appears to be an expression of resistance to infection by TRV.Resumen La mancha de anillo corchoso (torsión) en papa es causada por el virus del tobacco rattle (TRV) y trasmitido por el nematodo de la raíz gruesa (Paratrichodorus spp.). El daño consiste en manchas necróticas internas y superficiales de la piel, las cuales convierten a los tubérculos en no comerciables. La resistencia a la enfermedad ha sido extensamente documentada en los programas de mejoramiento. Se conocen altos niveles de resistencia para algunas variedades y líneas de mejoramiento. Debido a que tubér-culos infectados que carecen de síntomas han sido documentados, la naturaleza de la resistencia es un punto en debate. En campos de dos localidades donde un total de 1,259 tubérculos de líneas resistentes de mejoramiento Am.

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“…The control of TRV by crop rotation has proved difficult because the extended host range, including many weed species, of both the trichodorid nematodes and TRV limits the number of suitable crops which can be used and because TRV may remain transmissible by the vector nematodes for extended periods of time. Breeding for resistance to TRV has received little attention, but preliminary studies in potato have shown that the variability in TRV isolates poses a problem when screening new cultivars for TRV resistance or tolerance (Dale, 1989;Maas, 1975).…”

Section: Introductionmentioning

confidence: 99%

Susceptibility of transgenic tobacco plants expressing tobacco rattle virus coat protein to nematode-transmitted and mechanically inoculated tobacco rattle virus

Ploeg

Mathis

Bol

et al. 1993

Journal of General Virology

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Transgenic Samsun NN tobacco plants expressing the coat protein of tobacco rattle virus were exposed to mechanical leaf inoculation with tobacco rattle virus and to viruliferous trichodorid vector nematodes. Whereas plants were resistant to mechanical inoculation the vector nematodes successfully transmitted tobacco rattle virus to the roots as well as to the leaves of these plants.It is suggested that transgenic resistance is overcome either because vector nematodes inject relatively large numbers of virus particles into a cell or because they inject destabilized particles. The results indicate that coat protein-mediated resistance is unlikely to be of value for controlling tobacco rattle virus in field crops.

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Soil fumigation and crop rotation to control spraing disease in potatoes

Cited by 10 publications

References 4 publications

Cultivation factors influencing spraing in potato‐a statistical analysis

Cultivation factors influencing spraing in potato‐a statistical analysis

Characterization of Resistance to Corky Ringspot Disease in Potato: A Case for Resistance to Infection by Tobacco Rattle Virus

Susceptibility of transgenic tobacco plants expressing tobacco rattle virus coat protein to nematode-transmitted and mechanically inoculated tobacco rattle virus

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