Control of Disease by Fungicides

Plank, J.

doi:10.1016/b978-0-12-711450-7.50024-x

Cited by 36 publications

(47 citation statements)

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“…1, which contributed to a shortened epidemic and higher r values. According to Van der Plank (1963), the level of resistance of a certain potato cultivar to foliar diseases is directly related to the environmental conditions, which is one of the major characteristics of quantitative resistance in a hostpathogen interaction.…”

Section: Discussionmentioning

confidence: 99%

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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Three field experiments were carried out to assess the level of resistance of several cultivars to early blight (EB) and to examine the association between host resistance and either foliage maturity or tuber skin types. A total of 26 cultivars were used in Exps. 1 and 2, and 24 in Exp. 3. Plants were inoculated with isolates of Alternaria grandis at 31 days after planting. EB severity was quantified in each plot every seven days. The approach to determine the resistance levels of potato cultivars was based on multivariate analysis techniques. The tested cultivars responded as either resistant, moderately resistant, moderately susceptible or susceptible to EB. Most of the cultivars were classified as susceptible or moderately susceptible to EB. Resistant cultivars were mid-season, mid-late or late maturity. None of the susceptible cultivars were later maturity (mid-late or late maturity). In most cases, susceptible cultivars were earlier maturity (early or mid-early maturity). Most resistant cultivars had rough, mid-rough or smooth skin. None of the susceptible cultivars had rough skin. In most cases, susceptible or moderately susceptible cultivars had smooth skin. Obtaining potato cultivars that are resistant to this destructive disease will help reduce production costs and the need for costly fungicides.

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Section: Discussionmentioning

confidence: 99%

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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show abstract

“…A basic premise of epidemiology is that increased host abundance enhances disease transmission, both initially into a population and subsequently within it, resulting in increased disease severity [29][30][31]. As such, the diversitydisease hypothesis predicts that low host species diversity can result in an increase in disease severity of specialist pathogens, since low host richness can, through relaxed interspecific competition, increase relative abundances of one or more susceptible hosts [32,33]. The diversity-disease hypothesis is well supported in plant-pathogen systems [34][35][36][37][38][39] as well as some animal disease systems [40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Coral Diversity and the Severity of Disease Outbreaks: A Cross-Regional Comparison ofAcroporaWhite Syndrome in a Species-Rich Region (American Samoa) with a Species-Poor Region (Northwestern Hawaiian Islands)

Aeby

Bourne

Wilson

et al. 2011

Journal of Marine Biology

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The dynamics of the coral disease, Acropora white syndrome (AWS), was directly compared on reefs in the species-poor region of the Northwestern Hawaiian Islands (NWHI) and the species-rich region of American Samoa (AS) with results suggesting that biodiversity, which can affect the abundance of susceptible hosts, is important in influencing the impacts of coral disease outbreaks. The diversity-disease hypothesis predicts that decreased host species diversity should result in increased disease severity of specialist pathogens. We found that AWS was more prevalent and had a higher incidence within the NWHI as compared to AS. Individual Acropora colonies affected by AWS showed high mortality in both regions, but case fatality rate and disease severity was higher in the NWHI. The site within the NWHI had a monospecific stand of A. cytherea; a species that is highly susceptible to AWS. Once AWS entered the site, it spread easily amongst the abundant susceptible hosts. The site within AS contained numerous Acropora species, which differed in their apparent susceptibility to infection and disease severity, which in turn reduced disease spread. Manipulative studies showed AWS was transmissible through direct contact in three Acropora species. These results will help managers predict and respond to disease outbreaks.

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“…Initially Sr 11 provided comprehensive protection, but when cultivars with this gene were extensively cultivated strains virulent on plants with Sr11 became established. Van der Plank (1963) classified this gene as a moderately strong gene but in Australia for nearly a decade all prevalent strains of P. graminis tritici have shown virulence on plants with Sr 11. Since many leading Australian cultivars (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…The concept of 'strong and weak genes' for resistance to fungal pathogens (Van der Plank 1963) and the .many theories based on this hypothesis all postulate that as fungal strains acquire genes for virulence, they lose fitness. Since parasitic fungi, which have the ability to multiply rapidly, have coexisted with their hosts over long periods of time, it has been argued that the presence of effective genes for resistance in the host is proof for an accompanied loss of such fitness in a fungus possessing the corresponding genes for virulence (Robinson 1976).…”

Section: Introductionmentioning

confidence: 99%

Physiologic Differentiation of Wheat Stem Rust on Rye

Luig¹,

Tan²

1978

Aust. Jnl. Of Bio. Sci.

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Five self-fertile lines of Secale cereale possessing single genes conferring resistance to stem rust were successfully used to differentiate between strains of Puccinia graminis tritici. In an earlier study four of these lines were shown to differentiate between Australian cultures of P. graminis secalis. Gene H transferred from Wrens-5 rye to one of the five lines appears to be identical with gene Sr27 in Acosta's wheat-Imperial rye translocation stock WRT 238.5.Since, in the past, the genes for resistance in the rye lines have not been closely associated with P. graminis tritici and thus could not have exerted a selection pressure on the fungus, the present results imply that differentiation of a pathogen on host genotypes is, in the first instance, not due to specialization but is an intrinsic phenomenon of host-pathogen relationships. The results further suggest that fungal virulence per se is not associated with reduced fitness.

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Control of Disease by Fungicides

Cited by 36 publications

References 0 publications

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Coral Diversity and the Severity of Disease Outbreaks: A Cross-Regional Comparison ofAcroporaWhite Syndrome in a Species-Rich Region (American Samoa) with a Species-Poor Region (Northwestern Hawaiian Islands)

Physiologic Differentiation of Wheat Stem Rust on Rye

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