Wang, Q.; Zhang, X.; Wan, Y.; Zhao, Y. Alternaria alternata and Alternaria koreana, the Causal Agents of Leaf Spot in Celtis sinensis and Their Sensitivity to Fungicides. Forests2023, 14, 2389.
Wang, Q.; Zhang, X.; Wan, Y.; Zhao, Y. Alternaria alternata and Alternaria koreana, the Causal Agents of Leaf Spot in Celtis sinensis and Their Sensitivity to Fungicides. Forests 2023, 14, 2389.
Wang, Q.; Zhang, X.; Wan, Y.; Zhao, Y. Alternaria alternata and Alternaria koreana, the Causal Agents of Leaf Spot in Celtis sinensis and Their Sensitivity to Fungicides. Forests2023, 14, 2389.
Wang, Q.; Zhang, X.; Wan, Y.; Zhao, Y. Alternaria alternata and Alternaria koreana, the Causal Agents of Leaf Spot in Celtis sinensis and Their Sensitivity to Fungicides. Forests 2023, 14, 2389.
Abstract
Celtis sinensis is an adaptable species that is widely grown in southern China. In June 2022, a leaf blotch disease of C. sinensis was observed in Nanjing, Jiangsu, China. Based on morphological characterization, three isolates were identified as Alternaria species. Phylogenetic analysis of combined ITS, GAPDH, TEF1-α, RPB2 and Alt a 1 sequences identified the three isolates we obtained as Alternaria alternata and Alternaria koreana. Koch’s postulates were fulfilled in the greenhouse, and the pathogenicity of A. alternata and A. koreana was determined by leaf inoculation tests on C. sinensis seedlings. The symptoms of indoor inoculation were consistent with those in the field. A. alternata and A. koreana can grow at 15-35 °C, with an optimal growth temperature of 25 °C. The results of fungicide sensitivity experiments indicated that A. alternata and A. koreana were the most sensitive to prochloraz, which may be a useful strategy for the future prevention and control management of A. alternata and A. koreana. This study provides the first step for further research on A. alternata and A. koreana as pathogens of C. sinensis and provides a theoretical basis for future control strategies.
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