Influence of the Glasshouse Climate on Development of Diseases in a Cucumber Crop With Special Reference to Stem and Fruit Rot Caused by Didymella Bryoniae

Steekelenburg, N.A.M. van; Vooren, J. van de

doi:10.17660/actahortic.1981.118.6

Cited by 16 publications

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“…Due to an early incidence of D.bryoniae, a yield reduction of 10 to 20% is possible. These results were from unreplicated experiments in small glasshouses but were observed in two successive years and also in other experiments a higher disease incidence on the plants resulted in a reduction in number of harvestable fruits ( Van Steekelenburg and Van de Vooren, 1981).…”

Section: Fig 5 Het Verloop Van Het Totaal Aantal Stengellesiex Van supporting

confidence: 54%

“…It is easier to look for the very first symptoms as these can be spotted about the same time the first ascospores can be caught. When the first symptoms of the disease appear control must be achieved by a combined action of preventing humid conditions (Van Steekelenburg and Van de Vooren, 1981) and frequent sprayings with fungicides ( Van Steekelenburg, 1978a and1978b). verrot waren, bleven gedurende meer dan een jaar een infectiebron.…”

Section: Fig 5 Het Verloop Van Het Totaal Aantal Stengellesiex Van mentioning

confidence: 99%

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Epidemiological aspects of Didymella bryoniae, the cause of stem and fruit rot of cucumber

Steekelenburg¹

1983

Netherlands Journal of Plant Pathology

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The survival of Didymella bryoniae and the incidence of ascospores in glasshouses, outdoors and under controlled conditions were studied. The fungus was able to overwinter in the open as dormant mycelium. Dry and undecomposed crop residues remained a source of infection for more than one year. Moisture and a minimum temperature between 5 and 10 ~ were needed for fructification. For ascospore release a high relative humidity was not sufficient, the substrate had to be moist during a short period. Ascospores could be trapped throughout day and night both outdoors and in glasshouses, but there was a marked peak during a period of 3 h in the evening. Both on days with and without rain about the same numbers of ascospores : were trapped from crop residues in the open. Ascospore release was favoured by watering the plants in the glasshouse. Under controlled conditions the release of ascospores was determined by humidity and not by light or darkness.In a cucumber crop in the glasshouse the first ascospores were trapped at about the same time the first symptoms on the plants appeared. In the glasshouse with introduced diseased plant debris, particularly when the debris became wet when the plants were watered, the disease was more severe and yield was less than in a glasshouse without introduced plant debris. Airborne ascospores may cause the primary infection of a cucumber crop. Therefore, hygienic measures must be taken to eliminate plant debris as source of infection, both in glasshouses and outdoors.

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Section: Fig 5 Het Verloop Van Het Totaal Aantal Stengellesiex Van supporting

confidence: 54%

Section: Fig 5 Het Verloop Van Het Totaal Aantal Stengellesiex Van mentioning

confidence: 99%

Epidemiological aspects of Didymella bryoniae, the cause of stem and fruit rot of cucumber

Steekelenburg¹

1983

Netherlands Journal of Plant Pathology

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“…The percentage of fruits with internal rot varies from harvesting date to harvesting date, with 14~ as the highest recorded ( Van Steekelenburg and Van de Vooren, 1981). Apparently external fruit rot is as important as, or even more important than, internal fruit rot.…”

Section: Introductionmentioning

confidence: 98%

Factors influencing external fruit rot of cucumber caused by Didymella bryoniae

Steekelenburg

1982

Netherlands Journal of Plant Pathology

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Several factors influencing the occurrence and extent of external fruit rot caused by Didymella bryoniae on cucumbers in the post harvest period were studied.The minimum, optimum and maximum temperatures for growth of the fungus on fruits were circa 10, 23 and 35 ~ respectively. The influence of the temperature on the growth of the fungus in vitro and in vivo was about similar. The fitness of the fungus diminished by storing inoculated fruits at about the maximum temperature for growth of the fungus for one day, but this temperature influenced fruit quality negatively. Storing at 10 to 12 ~ is more advisable.Isolates of D. bryoniae showed variation in virulence. There was a linear relationship between growth on fruits and growth in vitro of these isolates, but no correlation was found with disease incidence on plants.The degree of fruit rot was increased by more severe wounding, by storing in the dark instead of in the light and by higher nitrogen fertilization of the crop. Relative humidity during storage had no effect on fruit decay. It is very likely that the amount and composition of available nutrients for fungus growth determine the degree of rotting of the fruits.Wkh the present cultivars, external fruit rot can be best controlled by reducing the changes of wounding in the pre-and post-harvest period.

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“…is an important disease of greenhouse grown cucumbers. In addition to losses from plant death, fruit rot may occur during storage and shipment (VAN STEEKELENBURG & VAN DE VOOREN, 1980; VAN STBEKELENBURG, 198 1, 1982;WIANT, 1945). Field grown cucumbers are also subject to this disease though they are generally more resistant than muskmelons and watermelons (NORTON, 1979;PRASAD & NORTON, 1967).…”

Section: Introductionmentioning

confidence: 99%

Search for resistance to gummy stem blight (Didymella bryoniae) in cucumber (Cucumis sativus L.)

Wyszogrodzka¹,

Williams

Peterson

1986

Euphytica

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Resistance to gummy stem blight (Didymeh bryoniue) was not detected among 1208 cucumber lines of diverse origin when cotyledons of four-day-old seedlings were inoculated with an aqueous suspension of 5000 spores of D. bryoniue delivered to freshly crushed tissue, followed by 48 h incubation at 20°C and 100% RH in the dark. Among 49 lots evaluated for gummy stem blight in the field, cv. Homegreen #2 and PI 200818 from Burma were resistant. Earliness in fruit maturity was positively correlated with susceptibility to gummy stem blight (r = 0.424). Cucumber accessions differed in the incidence ofstem and hypocotyl cankers. In greenhouse grown plants at the 2nd-3rd leaf stage, differentiation of resistant lines was obtained by spraying plants with an aqueous suspension of 106/ml D. bryoniue spores followed by 48 h incubation at 20°C and 100% RH in the dark. One cycle of mass selection in Homegreen #2 resulted in improved gummy stem blight resistance. 603 A. I. WYSZOGRODZKA,

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Influence of the Glasshouse Climate on Development of Diseases in a Cucumber Crop With Special Reference to Stem and Fruit Rot Caused by Didymella Bryoniae

Cited by 16 publications

References 0 publications

Epidemiological aspects of Didymella bryoniae, the cause of stem and fruit rot of cucumber

Epidemiological aspects of Didymella bryoniae, the cause of stem and fruit rot of cucumber

Factors influencing external fruit rot of cucumber caused by Didymella bryoniae

Search for resistance to gummy stem blight (Didymella bryoniae) in cucumber (Cucumis sativus L.)

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