Fungicide sensitivity in Tapesia yallundae populations collected from 15 wheat fields in the Western Cape province of South Africa

K. Ntushelo; P.W. Crous

doi:10.1080/02571862.2004.10635031

Fungicide sensitivity in Tapesia yallundae populations collected from 15 wheat fields in the Western Cape province of South Africa

K. Ntushelo
, P.W. Crous

Research output: Contribution to journal/periodical › Article › Scientific › peer-review

1 Citation (Scopus)

Abstract

In the Western Cape province of South Africa, eyespot disease (Tapesia yallundae) of wheat is primarily controlled by fungicide applications. Previous studies have shown, however, that isolates of T. yallundae vary in their response to fungicides. In the present study, 20 isolates from each of 15 fields with different fungicide histories were screened against carbendazim at 1 μg/ml; propiconazole, tebuconazole and flutriafol each at 0.1, 0.5, 1 and 2 μg/ml; and flusilazole and bromuconazole each at 0.05, 0.1, 0.5 μg/ml. No isolates were resistant to carbendazim. Flusilazole proved to be most effective of all the triazole fungicides tested. Based on the analysis of EC50 values compared to that of a field at Gouda that is at baseline sensitivity, shifts in sensitivity were detected to all triazoles. This suggests that measures for prevention of build-up of resistance need to be employed.

Original language	English
Pages (from-to)	104-108
Journal	South African Journal of Plant and Soil
Volume	21
Issue number	2
DOIs	https://doi.org/10.1080/02571862.2004.10635031
Publication status	Published - 2004

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title = "Fungicide sensitivity in Tapesia yallundae populations collected from 15 wheat fields in the Western Cape province of South Africa",

abstract = "In the Western Cape province of South Africa, eyespot disease (Tapesia yallundae) of wheat is primarily controlled by fungicide applications. Previous studies have shown, however, that isolates of T. yallundae vary in their response to fungicides. In the present study, 20 isolates from each of 15 fields with different fungicide histories were screened against carbendazim at 1 μg/ml; propiconazole, tebuconazole and flutriafol each at 0.1, 0.5, 1 and 2 μg/ml; and flusilazole and bromuconazole each at 0.05, 0.1, 0.5 μg/ml. No isolates were resistant to carbendazim. Flusilazole proved to be most effective of all the triazole fungicides tested. Based on the analysis of EC50 values compared to that of a field at Gouda that is at baseline sensitivity, shifts in sensitivity were detected to all triazoles. This suggests that measures for prevention of build-up of resistance need to be employed.",

author = "K. Ntushelo and P.W. Crous",

year = "2004",

doi = "10.1080/02571862.2004.10635031",

language = "English",

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pages = "104--108",

journal = "South African Journal of Plant and Soil",

issn = "0257-1862",

publisher = "Taylor \& Francis Group",

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T1 - Fungicide sensitivity in Tapesia yallundae populations collected from 15 wheat fields in the Western Cape province of South Africa

AU - Ntushelo, K.

AU - Crous, P.W.

PY - 2004

Y1 - 2004

N2 - In the Western Cape province of South Africa, eyespot disease (Tapesia yallundae) of wheat is primarily controlled by fungicide applications. Previous studies have shown, however, that isolates of T. yallundae vary in their response to fungicides. In the present study, 20 isolates from each of 15 fields with different fungicide histories were screened against carbendazim at 1 μg/ml; propiconazole, tebuconazole and flutriafol each at 0.1, 0.5, 1 and 2 μg/ml; and flusilazole and bromuconazole each at 0.05, 0.1, 0.5 μg/ml. No isolates were resistant to carbendazim. Flusilazole proved to be most effective of all the triazole fungicides tested. Based on the analysis of EC50 values compared to that of a field at Gouda that is at baseline sensitivity, shifts in sensitivity were detected to all triazoles. This suggests that measures for prevention of build-up of resistance need to be employed.

AB - In the Western Cape province of South Africa, eyespot disease (Tapesia yallundae) of wheat is primarily controlled by fungicide applications. Previous studies have shown, however, that isolates of T. yallundae vary in their response to fungicides. In the present study, 20 isolates from each of 15 fields with different fungicide histories were screened against carbendazim at 1 μg/ml; propiconazole, tebuconazole and flutriafol each at 0.1, 0.5, 1 and 2 μg/ml; and flusilazole and bromuconazole each at 0.05, 0.1, 0.5 μg/ml. No isolates were resistant to carbendazim. Flusilazole proved to be most effective of all the triazole fungicides tested. Based on the analysis of EC50 values compared to that of a field at Gouda that is at baseline sensitivity, shifts in sensitivity were detected to all triazoles. This suggests that measures for prevention of build-up of resistance need to be employed.

U2 - 10.1080/02571862.2004.10635031

DO - 10.1080/02571862.2004.10635031

M3 - Article

SN - 0257-1862

VL - 21

SP - 104

EP - 108

JO - South African Journal of Plant and Soil

JF - South African Journal of Plant and Soil

IS - 2

ER -

Fungicide sensitivity in Tapesia yallundae populations collected from 15 wheat fields in the Western Cape province of South Africa

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