Biological control of Rhizoctonia solani on potatoes by antagonists. 4. Inoculation of seed tubers with Verticillium biguttatum and other antagonists in field experiments

Jager, G.; Velvis, H.

doi:10.1007/bf01974301

Cited by 41 publications

(23 citation statements)

References 17 publications

(17 reference statements)

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“…Promising results have been obtained with the control of black scurf caused by Rhizoctonia solani with the application of the antagonistic fungus Verticiltium biguttatum (Jager and Velvis, 1985) at the first lifting with green-crop-harvesting Mulder et al, 1990;Mulder et al, 1991). It is an interesting example of what can be achieved in the field of potato pest management combining two new research approaches.…”

Section: Green-crop-harvestingmentioning

confidence: 91%

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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Section: Green-crop-harvestingmentioning

confidence: 91%

Recent and future developments in potato fungal pathology

Schöber

Turkensteen²

1992

Netherlands Journal of Plant Pathology

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“…One of the most effective proved to be V. biguttatum (Jager and Velvis, 1985), provided that soil temperature is 15 ~ or more (Velvis and Jager, 1983). Application of spores of the fungus V. biguttatum (40 ml/m 2 with 108 ml 1 spores) at the first lifting showed a further strong decrease of the black scurf incidence (Fig.…”

Section: State Of the Artmentioning

confidence: 98%

Perspectives of green-crop-harvesting to control soil-borne and storage diseases of seed potatoes

Mulder¹,

Turkensteen²,

Bouman³

1992

Netherlands Journal of Plant Pathology

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An overview is given on the history of vine killing meant to reduce virus transmission to potato seed tubers. With mechanical harvesting, problems arise with respect to skin damage and pathogens, which strongly develop on the decaying vines and roots, such as Rhizoctonia solani, Phoma exigua var.foveata and Erwinia spp. Green-crop-harvesting (GCH), a recently developed fully mechanical vine killing method, is marked by vine destruction, lifting tubers, placing them on a soil bed followed by covering them with soil and an in situ healing period of at least ten days in the newly formed ridges.GCH is characterized by a very low level of skin damage, excellent healing conditions and reduced development of above mentioned pathogens.By applying fungicides or antagonistic organisms with the first lifting, effective control was achieved of a number of important potato diseases. Late blight was controlled by fungicides. Control of black scurf and gangrene was improved by the application of either fungicides or antagonists. Erwinia spp. were found to be effectively controlled by antagonists. Perspectives of GCH to control these diseases and other important ones are discussed.

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“…CMC was applied with microbial agents to seeds to control R. solani. One percent CMC with clay carrier was applied to Verticillium biguttatum and other biocontrol agents to potato tubers (Jager and Velvis 1985). Various antagonists have been applied to treat the sugar beet seeds using either gum xanthan or methylcellulose in combination with a neutralized talc or peat carrier (Suslow and Schroth 1982).…”

Section: Seed Treatmentmentioning

confidence: 99%