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Sensitivity of Puccinia graminis f. sp. tritici Isolates From China to Triadimefon and Cross-Resistance Against Diverse Fungicides

Authors :
Yong Chun Qiu
Xiaofeng Xu
Qiu Jun Lin
Xian Xin Wu
Q. Bian
Tian Ya Li
Qian Sun
Yuan Hu Xuan
Yuanyin Cao
Xin Yu Ni
Source :
Plant Disease. 104:2082-2085
Publication Year :
2020
Publisher :
Scientific Societies, 2020.

Abstract

Wheat stem rust caused by Puccinia graminis f. sp. tritici is an important wheat disease with sudden and devastating characteristics. The appearance and spread of new P. graminis f. sp. tritici races (Ug99, TKTTF, and TTTTF) have once again renewed the interest in the prevention and control of wheat stem rust. Fungicides can effectively control the epidemics of this disease in a short period of time. However, the fungal pathogen is prone to developing resistance. Therefore, we collected 89 isolates of P. graminis f. sp. tritici from four provinces in China and used the spore germination method to test the sensitivity of the isolates to fungicide triadimefon. Seven relatively triadimefon-sensitive isolates and six relatively triadimefon-resistant isolates were further tested for sensitivity to fungicides carbendazim, mancozeb, thiophanate-methyl, and kresoxim-methyl. The results showed that the mean concentration for 50% of maximal effect of the isolates to triadimefon was 16.14 mg·liter−1, and the mean resistance factor was 4.48. Only 29 isolates were resistant to triadimefon in which 27 isolates had low levels of resistance and 2 isolates had moderate levels of resistance. However, most of the 89 isolates had no resistance to triadimefon. There was a positive correlation between resistance to triadimefon and carbendazim, but there was no cross-resistance between triadimefon resistance with thiophanate-methyl or kresoxim-methyl resistance. This study provides valuable information for managing fungicide resistant isolates of P. graminis f. sp. tritici.

Details

ISSN :
19437692 and 01912917
Volume :
104
Database :
OpenAIRE
Journal :
Plant Disease
Accession number :
edsair.doi...........d263373a783930c8f4e49bc67b32c9ad
Full Text :
https://doi.org/10.1094/pdis-01-20-0009-re