A pattern in the appearance of cucumber powdery mildew in Dutch glasshouses

Schepers, H.T.A.M.

doi:10.1007/bf01976383

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Due to the natural ventilation of the greenhouse investigated, there could be an exchange of air between greenhouse and outdoor environment, depending on the outdoor climate (Wang et al 1999). Because of this, fungal spores can enter and leave the greenhouse (Zadoks 1967;Schepers 1984, Frinking 1991Kerssies 1993a). In the present study, less than the quarter of the greenhouse microfungal taxa has been detected in the outdoors samples.…”

Section: Discussionmentioning

confidence: 98%

The air spora of an orchid greenhouse

et al. 2010

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The orchid collection of the ELTE Botanical Garden, Budapest, Hungary was monitored for airborne fungi using viable and non-viable air-sampling methods (Hirst-type and a 3-stage Andersen sampler) with three different culture media. A new culture method was also applied to identify fungal spores from Hirst-type samples. The aim of this study was to determine the diversity, human-and phytopathological potential of the air spora. To find out sources of airborne fungi, samples were collected from the air in an adjacent greenhouse and outdoors, and from necrotic plants. A total of 58 genera were found in the air samples. Cladosporium and Penicillium spp. were common members of the airborne biota. A high proportion (27.5%) of identified genera may be presented as a member of microbial consortium associated with the orchids. Airborne fungi potentially pathogenic to humans were also detected. One species, Zygosporium masonii, was new to Hungary. Statistical analysis indicated that conditions of sampling had significant effects. The principal component analysis elucidated the three principal components representing 75.34% of the total variance; the clusters of variables were related to the three types of culture media. Relative abundance of small-sized spores was high, presumably because of the fungal species composition and accelerated sedimentation of large spores in still air. Apparently, in the studied orchid greenhouse, a specific mycobiota developed due to the climate and hosts (Orchideaceae) grown there.

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Section: Discussionmentioning

confidence: 98%

The air spora of an orchid greenhouse

et al. 2010

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“…Frinking (1991) stated that there is a continuous exchange of air between the glasshouse and the outside environment. Schepers (1984) suggested that conidia of Sphaerotheca fuliginea will also be transported easily into and out of glasshouses.…”

Section: Discussionmentioning

confidence: 98%

Horizontal and vertical distribution of airborne conidia of Botrytis cinerea in a gerbera crop grown under glass

Kerssies¹

1993

Netherlands Journal of Plant Pathology

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The horizontal and vertical distribution of airborne conidia of Botrytis cinerea in a gerbera crop in two glasshouses (100 m 2 and 350 m 2) was studied during 18 months in 1988 and 1989. Conidia of B. cinerea were caught in simple spore traps consisting of agar in Petri dishes placed in a regular pattern at three different heights in the glasshouse and counted as colonies, after incubation. Lesions due to conidial infection were counted on gerbera petals. The horizontal and vertical distribution of conidia ofB. cinerea in a gerbera crop grown under glass was fairly uniform in both distinct glasshouses. Conidia of B. cinerea trapped in a glasshouse can originate from sources inside and outside the glasshouse. No significant interaction was found between location and time for the colony counts and for the log transformed (ln(N + 1)) lesion counts. The results of this study suggest that spore trapping at one height and at a limited number of locations and dates is sufficient for efficient monitoring of B. cinerea in a glasshouse.

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“…Four were in the district of Limburg. The remaining four glasshouses in the survey were situated in Breda (district West-Brabant), Vleuten (district Vleuten) and Klazienaveen (district Drenthe) (Schepers, 1984b). All fungicide applications used to control S.fuliginea in these glasshouses were recorded.…”

Section: Methodsmentioning

confidence: 99%

“…The frequency of treatment with EBIs, determined by the severity of the mildew epidemic and by regional differences in the advice by extension officers, varied between years and between districts (Table 1). In Pijnacker, and to a lesser degree in Klazienaveen, where many cucumber crops are present in a small area, the infection pressure is usually higher than in other districts (Schepers, 1984b). EBIs with curative and systemic properties were applied more often in these districts than elsewhere.…”

Section: Cross-resistance Positively Correlated Cross-resistance In mentioning

confidence: 99%

Changes during a three-year period in the sensitivity to ergosterol biosynthesis inhibitors of Sphaerotheca fuliginea in the Netherlands

Schepers

1985

Netherlands Journal of Plant Pathology

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Isolates of Sphaerotheca fuliginea collected in 1981-1984 in cucumber glasshouses in the Netherlands were tested for their sensitivity to the ergosterol biosynthesis inhibitors (EBIs) fenarimol and imazalil.The data collected in the 1981 survey indicated that sensitivity to EBIs was lower than that of reference isolates. In the 1982 and 1983 surveys, sensitivity to EBIs continued to decrease. In 1984, data were collected until July; no significant difference in sensitivity with the 1983 level was apparent.Isolates collected in the district of Limburg, where EBIs were applied less frequently than in the district of Pijnacker, showed a significantly higher sensitivity to EBIs than isolates collected in Pijnacker.Besides differences in sensitivity to EBIs between years, differences within years were noticed. In 1983, the sensitivity to fenarimol and imazalil was significantly higher in the beginning of the growing season, before any fungicides were applied, than later in the growing season.Generally, changes in sensitivity to EBIs did not result in full failure of control. In most cases, a change to shorter spray intervals has been sufficient to compensate for the decrease in sensitivity and to achieve proper control by fenarimol and imazalil. The results once more emphasize', the necessity of designing strategies to prevent resistance to EBIs.

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A pattern in the appearance of cucumber powdery mildew in Dutch glasshouses

Cited by 7 publications

References 9 publications

The air spora of an orchid greenhouse

The air spora of an orchid greenhouse

Horizontal and vertical distribution of airborne conidia of Botrytis cinerea in a gerbera crop grown under glass

Changes during a three-year period in the sensitivity to ergosterol biosynthesis inhibitors of Sphaerotheca fuliginea in the Netherlands

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