Das auftreten von Pathotypen vonPhytophthora infestans (Mont.) de Bary in der Bundesrepublik Deutschland

Schrober, B.

doi:10.1007/bf02361786

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…In both cases complex races of the fungus prevailed. The same phenomenon, namely early occurrence of complex races, reported HAHN et al (1973), SWISZCZEWSKA et al (1974) and SCHOBER (1975). Therefore, a previously suggested sequence (simple races at the beginning and complex races at the end of epidemics) seems to be dianged.…”

Section: Discussionsupporting

confidence: 56%

Pathogenic Variation among Field Isolates of Phytophthora infestans

Pietkiewicz

1978

J Phytopathol

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Section: Discussionsupporting

confidence: 56%

Pathogenic Variation among Field Isolates of Phytophthora infestans

Pietkiewicz

1978

J Phytopathol

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“…More about resistance is presented by Sch6ber (1992). An additional problem with late blight control is the occurrence of resistance to systemic fungicides such as metalaxyl (Davidse et al, 1981;Dowley and O'Sullivan., 1981;Sch6ber, 1984).…”

Section: Glycoalcaloids and Phytoalexinsmentioning

confidence: 98%

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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“…With the introduction of systemic phenylamide fungicides (metalaxyl, oxadixyl) and cyanocetamide-oximes (cymoxanil), it was thought that the late blight problem was solved. Resistance against metalaxyl (Davidse et al, 1981;Dowley and O' Sullivan, 1981;Sch6ber, 1984) developed very rapidly but not against cyanocetamide-oximes. Strategies have been worked out to prolong the effectiveness of systemic fungicides.…”

Section: Fungicidesmentioning

confidence: 98%

Control of late blight, Phytophthora infestans, in integrated crop management

Schöber¹

1992

Netherlands Journal of Plant Pathology

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Integrated plant protection is described as a combination of methods in which the use of chemical plant protection substances is limited to the essential minimum. To fulfil this demand in respect of late blight control it is necessary to avoid all possibilities which influence the start of an epidemic development. The epidemic normally starts from infected tubers, so sanitary precautions are the first point. This means not having cull piles around the store houses and presprouting the tubers to discard heavily infected seed lots.The next step is the use of resistant varieties which allow the reduction of fungicide applications. This point should be sustained by a fertilization which does not raise the susceptibility and by a good warning system for late blight like 'Negativ Prognosis'. The active ingredients of the fungicides should be changed between applications to avoid forming resistance of the fungus. This means that after a systemic fungicide a contact fungicide should follow.After the theoretical explications the results of a field trial are given which has been running on a farm near Braunschweig.

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Das auftreten von Pathotypen vonPhytophthora infestans (Mont.) de Bary in der Bundesrepublik Deutschland

Cited by 8 publications

References 5 publications

Pathogenic Variation among Field Isolates of Phytophthora infestans

Pathogenic Variation among Field Isolates of Phytophthora infestans

Recent and future developments in potato fungal pathology

Control of late blight, Phytophthora infestans, in integrated crop management

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