Abstract: To evaluate the field control efficacy of different chemical fungicides against vine tea early blight, field experiments were performed in three different vine tea plantations, and the relative field control efficacy of different fungicide treatments were compared in the current study. The results showed that 0.3% tetramycin [aqueous solution (AS)] and 40.0% difenoconazole-pyraclostrobin [suspension concentrate (SC)] exhibited excellent control effects against vine tea early blight in three experimental sites, and the average control efficiencies were 92.93% and 88.38%, respectively. At the experimental site of Ligongqiao Village, Yongding District, Zhangjiajie, there was no significant difference in control efficacy between 0.3% tetramycin (AS) and 40.0% difenoconazole-pyraclostrobin (SC), and both were significantly higher than that of 40.0% difenoconazole (SC), 20.0% pyraclostrobin (SC), and 125 g/L epoxiconazole (SC). In Houwang Village, Sanjiaguan Township, the control efficacy of 0.3% tetramycin (AS) was significantly higher than that of 40.0% difenoconazole-pyraclostrobin (SC), and both were significantly higher than that of 40.0% difenoconazole (SC), 20.0% pyraclostrobin (SC) and 125 g/L epoxiconazole (SC). In Binglangping Village, Luotaping Township, the control efficacy of 0.3% tetramycin (AS) was the best among all treatments. Overall, 0.3% tetramycin (AS) and 40.0% difenoconazole-pyraclostrobin (SC) exhibited good control efficacies and can be used as ideal agents for the control of vine tea early blight.

Keywords: tetramycin; vine tea early blight; fungicide; field control efficacy; screening of fungicide

（Acta Laser Biology Sinica, 2026, 35(4): 347-351）