Occurrence of <i>Verticillium dahliae</i> on linseed (<i>Linum usitatissimum</i>) in the UK and Germany

Fitt, Bruce D.L.; Bauers, F.; Burhenne, S.; Paul, V. H.

doi:10.1111/j.1365-3059.1992.tb02322.x

Cited by 8 publications

(3 citation statements)

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“…The only pattern to emerge from the limited data obtained in the survey was the higher incidence of significant levels of V. dahliae infestation in sites with a history of vegetatively propagated crops (including apple which is not known to be susceptible to this pathogen) than in sites with a history of seed propagated crops. However, to this putative risk category must now be added linseed, since the emergence of clear evidence that this plant is a potent amplifier of soil inoculum of V. dahliae and that the pathogen may also be seed-borne in this crop (Fitt et al, 1992;Harris, 1993).…”

Section: Verticillium Wilt Risk Prediction 111mentioning

confidence: 99%

The relationship between the amount of Verticillium dahliae in soil and the incidence of strawberry wilt as a basis for disease risk prediction

Harris

Yang²

1996

Plant Pathology

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The incidence of wilt was recorded in runner and fruiting crops of 13 strawberry cultivars at 72 locations in southern England in 1989 and 1990, and soil samples from the sites were analysed for Verticillium dahliae. Linear regressions of wilt incidence on inoculum concentration in soil for runner crops of the susceptible cv. Elsanta in both years were significant whilst that for runner crops of the susceptible cv. Hapil in 1989 approached significance; the regression for cv. Elsanta fruiting crops in 1990 was not significant. The inclusion of sand content of soil in the regression model improved the fit for the cv. Hapil data but not for the cv. Elsanta data; neither clay nor silt content of soil significantly improved the fit of the models for any data set. There were insufficient data in either year for regression analysis for other cultivars, but the levels of wilt generally corresponded with the degree of soil infestation and broadly reflected known field resistance. The data were used to estimate an inoculum concentration which corresponds to 5% wilt incidence (IC5) for cv. Elsanta. It is suggested that this could be used as a yardstick for determining the risk of unacceptable levels of wilt in susceptible cultivars on the basis of pre‐planting soil analysis. For the 44 sites where the cropping history over the 15 years prior to soil analysis was available there was no clear association between any crop and soil infestation levels at or above the IC5. However, V. dahliae was more common at sites with a history of vegetatively propagated crops than at sites which had only supported crops grown from true seed.

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Section: Verticillium Wilt Risk Prediction 111mentioning

confidence: 99%

The relationship between the amount of Verticillium dahliae in soil and the incidence of strawberry wilt as a basis for disease risk prediction

Harris

Yang²

1996

Plant Pathology

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“…The effect of removal of the flax debris was significant in treatments with high potato isolate infestation. Based on 1-year experiments, Fitt et al (1992) concluded that both fibre flax (i.e. pulled flax) and linseed (i.e.…”

Section: Discussionmentioning

confidence: 99%

Effects of crop species, crop cultivars and isolates of Verticillium dahliae on the population of microsclerotia in the soil, and consequences for crop yield

Mol¹,

Halteren²,

Schölte³

et al. 1996

Plant Pathology

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In a micro-plot experiment the development of the inoculum density of Verticillium dahliae in soil was studied and consequences for yields of potato cvs Element, Ostara, Astarte, and Mirka, faba bean, flax, pea, barley, sugar beet and onion were evaluated. In May 1991, 75-litre containers were filled with sterile soil. Soil was infested with 2 or 200 microsclerotia per g of a potato isolate or a faba bean isolate of V. dahliae . The same crop species and cultivar was grown on the same plot in 1991 and 1992. For flax, a non-pulled crop was compared with a pulled crop. Fallow plots were included as a control. In 1993, potato cv. Element was grown on all plots. During 3 years the soils were sampled, and the soil inoculum densities were assessed by plating the soil on a semi-selective medium.In 1991, yield differences in dry matter per plot between isolates were only significant for potato cv. Element (lower yield when infected with potato isolate), and potato cv. Astarte, faba bean, and sugar beet (lower yield when infected with faba bean isolate). In 1992, isolates and infestation levels did not affect the dry matter yields per plot. In 1993, haulm dry matter yield per plot of potato cv. Element was affected by the isolate, the inoculum density and the crop grown in the previous years. Plots previously cropped to potato cvs Element, Astarte and Mirka gave the lowest dry matter yields in 1993.No decrease of inoculum density occurred under any crop species or cultivar grown. Increase of inoculum densities was significant for potato cvs Element, Ostara, Astarte, and faba bean at the low initial soil infestation level. At the high initial soil infestation level the effect of crop species and cultivar on the inoculum densitiy depended on the isolate used. Potato cultivars seemed to be more susceptible to potato isolate than to faba bean isolate and faba bean seemed to be more susceptible to faba bean isolate than to potato isolate. Removing flax culms from the field diminished the increase of the inoculum density in treatments infested with potato isolate at a high level.In 1993, the concentration of microsclerotia in the haulm debris was positively related to the inoculum density in the soil, and the haulm dry matter yield was negatively related to the inoculum density in the soil.

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“…lini Bolley (Mercer et al 1991) and Verticillium dahliae Kleb. (Fitt et al 1992). This paper reports field experiments at Rothamsted to investigate the effects of diseases on the growth and yield of linseed in 1988, 1989 and 1990.…”

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Effects of fungal diseases on linseed (Linum usitatissimum) growth and yield, 1988–1990

Fitt

Ferguson

1993

J. Agric. Sci.

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SUMMARYEffects of diseases on growth and yield of linseed (cv. Antares) were assessed by controlling diseases with fungicide treatments in field experiments at Rothamsted from 1988 to 1990. Fungicide seed treatments decreased the incidence of Alternaria lesions on cotyledons and stem bases of emerging seedlings in 1989 but decreased emergence in 1990. The incidenceof leaf browning, associated with Alternaria spp. and Botrytis cinerea, was less in 1989 and 1990 than in 1988 when the period, in July, between flowering and harvest was wet, but the incidence of powdery mildew was greater in 1989 and 1990 than in 1988. Fungicide spraysdecreased leaf browning in 1988 and powdery mildew in 1990. In 1988 there were more capsules per plant and the crop was taller than in either 1990 or 1989, when July and August were hot withperiods of dry weather. The incidence of plants with dark brown stems, associated with Verticillhun dahliae, was greater in 1989 and 1990 than in 1988, but was not greatly affected byfungicide treatments. The incidence of Alternaria linicola on sepals, capsule cases and seed from capsules sampled before harvest was decreased by fungicide treatments. Other fungi isolated from these tissues included A. alternata, A. infectoria, B. cinerea, Fusarium spp. and V. dahliae. Yields of grain and oil were increased by fungicide treatments in all three years, but the yield increases were greatest in 1988 when fungicide treatments also increased 1000-grain weight. The incidence of fungi on the harvested seed was not greatly affected by fungicide treatments.

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Occurrence of Verticillium dahliae on linseed (Linum usitatissimum) in the UK and Germany

Cited by 8 publications

References 1 publication

The relationship between the amount of Verticillium dahliae in soil and the incidence of strawberry wilt as a basis for disease risk prediction

The relationship between the amount of Verticillium dahliae in soil and the incidence of strawberry wilt as a basis for disease risk prediction

Effects of crop species, crop cultivars and isolates of Verticillium dahliae on the population of microsclerotia in the soil, and consequences for crop yield

Effects of fungal diseases on linseed (Linum usitatissimum) growth and yield, 1988–1990

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