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

Jong, Piet de

doi:10.1007/bf01874760

Cited by 7 publications

(16 citation statements)

References 5 publications

(2 reference statements)

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“…Preliminary work (Kennedy, 1993, HRI, Wellesborne, unpublished) where crops were inoculated at different times of year showed that leek rust inoculations in July and August resulted in similar disease incidence and severity curves while later inoculations during late September resulted in very much slower disease progress. This has been attributed by other workers to falling temperatures (de Jong, 1995). It is evident that further work is needed to establish the effect of weather on leek rust infection.…”

Section: Discussionmentioning

confidence: 89%

“…In addition to experiments with propiconazole doses, single unsprayed 15 × 15 m plots of leeks grown as above were inoculated using different numbers of infector plants at Stockbridge House and Kirton in 1994, 1995and 1996. Appropriate numbers of infector plants were transplanted in mid-July to give initial inoculation levels of 0 .…”

Section: Field Experiments With Different Leek Rust Inoculation Levelsmentioning

confidence: 99%

“…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%

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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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Section: Discussionmentioning

confidence: 89%

Section: Field Experiments With Different Leek Rust Inoculation Levelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 1997

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“…Resting spores and alternative hosts are of minor significance in the pathogen's epidemiology. Only the uredosori are commonly present in the Netherlands; teleutosori are rarely observed [de Jong, 1994]. Rust of leek can infect A. vineale L. [Jennings et al, 1990a] which is a common wild plant in the Netherlands but isolates are not infective on leek [R. Niks, pers.…”

Section: Introductionmentioning

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%

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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Sampling for detection: Leek rust as an example

Jong¹

1995

International Journal of Pest Management

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Computer simulation was used to compare four sampling patterns in their efficiency of detecting diseased plants under a variety of spatial distributions of infected plants. The sampling patterns compared were: diagonal sampling, double diagonal sampling, row sampling over two rows and row sampling over four rows. Row sampling over four rows was the most effective sampling pattern. The detection level, the lowest disease level at which the probability to detect the disease is sufficiently large, was studied in relation to temporal and spatial characteristics of the disease, as found in two epidemics in 1992 and 1993. For both epidemics, a weekly sample of 50 plants resulted in detection levels that were low enough to ensure adequate chemical control, indicating the feasibility of sampling for detection of leek rust. Weekly sampling is more efficient than fortnightly sampling.

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

Cited by 7 publications

References 5 publications

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

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

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

Sampling for detection: Leek rust as an example

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