Development of Procymidone and Difenoconazole Resistance in <i>Alternaria alternata</i>, the Causal Agent of Kiwifruit Brown Spot Disease.

ABSTRACT: Brown spot, caused by Alternaria alternata, is the most important leaf fungal disease threatening kiwifruit production in China, and it is typically controlled through the application of fungicides, such as procymidone and difenoconazole. To date, fungicide resistance development has not yet been systematically reported for the pathogen of kiwifruit. A total of 135 single-conidium A. alternata isolates were collected from different cities in Zhejiang Province, China. Alternaria alternata developed prevailing resistance to procymidone and initial resistance to difenoconazole, with resistance frequencies of 60.7 and 13.3%, respectively. Positive cross-resistance was observed between procymidone and iprodione but not between procymidone and difenoconazole, tebuconazole, p

SUBMITTER: Liu Y 

PROVIDER: S-EPMC12300078 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature