Reaction of leek cultivars to infection by <i>Puccinia allii</i>

Uma, N. U.; Taylor, G.

doi:10.1111/j.1365-3059.1991.tb02370.x

Cited by 6 publications

(11 citation statements)

References 3 publications

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“…Each group of cultivars has specific characteristics, such as fast growth for early summer cultivars and hardiness for late winter cultivars. Although there is no complete resistance against leek rust at present, differences in susceptibility have been found among cultivars in the United Kingdom [Uma and Taylor, 1991;Smith and Crowther, 1992].…”

Section: Introductionmentioning

confidence: 99%

Growth of leek rust epidemics in time in three cultivars during the early stage of the epidemic

Jong¹

1995

Eur J Plant Pathol

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The growth of leek rust epidemics in time under favourable conditions in three leek cultivars during two years was analysed. In both years, the highest disease levels were found on cultivar Albana, followed by Carina and Cortina. A simple model is presented to correct the results for exchange of inoculum between adjacent plots. The results of this model indicate, that the difference in rust infection between the cultivars may be due to a reduced growth of the epidemic in young plants of cultivars Cortina and Carina. In older plants, the ranking in susceptibility was reversed, causing a less pronounced difference in infection between the cultivars. The growth of leek rust epidemics during the early stage of the epidemic in isolated plots was satisfactorily described by an exponential model.

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Section: Introductionmentioning

confidence: 99%

Growth of leek rust epidemics in time in three cultivars during the early stage of the epidemic

Jong¹

1995

Eur J Plant Pathol

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“…The period of the year favourable for increase of leek rust is assumed to be between 1 April and 1 November when the latent period is assumed to be constant and 14 days long [Jennings et al, 1990a, b~ Uma andTaylor, 1991, de Jong, 1994]. The relative growth rate of the disease r was found to be variable with the growth stage of the crop [de Jong, 1994].…”

Section: Parametersmentioning

confidence: 99%

“…The disease is able to survive low temperatures during winter in infected plants, permitting regrowth once temperatures rise. At present, there are no completely resistant leek cultivars, but differences in susceptibility have been found among cultivars in the United Kingdom [Uma and Taylor, 1991;Smith and Crowther, 1992], Germany [Albert and Smolka, 1994] and the Netherlands [de Jong, 1994].…”

Section: Introductionmentioning

confidence: 99%

“…Research on the control of leek rust has concentrated on breeding for resistance [Jennings et al, 1990a;Uma and Taylor, 1991;Smith and Crowther, 1992] and the optimal use of fungicides [von Meyer and Kessler, 1990;de Jong, 1995], but little attention has been given to preventive measures. This study focuses on the opportunities for and benefits of preventive measures for individual growers, to reduce the need for chemical control against leek rust; these can be divided into strategic measures and tactical measures [Conway, 1984].…”

Section: Introductionmentioning

confidence: 99%

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The reduction of chemical control of leek rust, a simulation study

Jong¹,

Daamen²,

Rabbinge

1995

Eur J Plant Pathol

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A model is presented which simulates chemical control against leek rust under a system of supervised control. The spread of disease between fields in one farm and the influx of spores from outside is part of the model. The possible reduction in fungicide sprays against leek rust following various preventive measures is estimated with this model. Results from this preliminary model suggest that supervised control of leek rust will result only in a considerable reduction in the number of fungicide sprays if the leek fields are sufficiently isolated and the planting material is initially disease free. Where isolation between the fields is not feasible, overlap between successive crops should be avoided. Without the use of these preventive measures, there is little prospect for supervised control and the grower will have no option but the heavy use of fungicides.

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“…Although there have been reports of differences in cultivar susceptibility (Burchill et al, , 1984Uma & Taylor, 1991;Smith & Crowther, 1993;de Jong, 1995), control of leek rust has mainly been by using fungicides containing either triadimefon or fenpropimorph (Maude et al, 1981Jones, 1986). Recently, propiconazole (Tilt, Ciba Agriculture), a systemic fungicide with ergosterol-biosynthesis inhibiting (EBI) properties (Kwok & Loeffler, 1993), has been approved for leek rust control.…”

Section: Introductionmentioning

confidence: 99%

Quantifying the effect of reduced doses of propiconazole (Tilt) and initial disease incidence on leek rust development

et al. 1997

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The effect of reduced doses of propiconazole (Tilt) and different initial inoculation levels on leek rust caused by Puccinia allii was quantified by three parameters: (i) rate of plant-to-plant spread (b), (ii) the time taken for 50% plant infection (m) and, (iii) rate of appearance of new pustules. All propiconazole doses tested reduced values for b compared with an unsprayed treatment but lower doses had little effect on new pustule appearance. Although b values were different for the same propiconazole dose at two field sites with different epidemics, values compared with the unsprayed treatments were similar. Fungicide efficacy was therefore measured independently of disease level in the field. The parameter b for rust spread was also directly related to marketable yield at harvest. Initial rust incidence levels of < 0 . 1% infected plants reduced b compared with higher levels (0 . 5-5%). This suggests that rust spread occurs at a maximum rate unless incidence is extremely low. Reduced doses of propiconazole also suppressed spore germination of P. allii and the appearance of rust pustules in inoculated plants in the glasshouse. The value of the parameters identified is discussed in relation to leek rust control, epidemiology and the effect of weather.

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Reaction of leek cultivars to infection by Puccinia allii

Cited by 6 publications

References 3 publications

Growth of leek rust epidemics in time in three cultivars during the early stage of the epidemic

Growth of leek rust epidemics in time in three cultivars during the early stage of the epidemic

The reduction of chemical control of leek rust, a simulation study

Quantifying the effect of reduced doses of propiconazole (Tilt) and initial disease incidence on leek rust development

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