Analysis on the registration status of triazole fungicides in China based on the registered dosage

In this paper, the information of 21 triazole fungicides registered on China Pesticide Registration Information Website (http://www.icama.org.cn/) were analyzed. Among them, 8 fungicides (triadimefon, propiconazole, triadimenol, flutriafol, diniconazole, tebuconazole, myclobutanil, epoxiconazole) with relatively larger recommended active ingredient dosage differences and more abnormal high value points were selected. Their formulations, crops and targets were analyzed respectively. Furthermore, three active ingredients (tebuconazole, epoxiconazole, propiconazole), four crops (lawn, banana, banana tree and wheat) and three targets (brown spot, leaf spot and powdery mildew) with relatively larger recommended active ingredient dosage differences and more abnormal high value points were selected to conduct combined analysis. Among which, a total of 10 “active ingredient-crop-target” combinations have been registered. The results showed that: 1) The maximum dosage of the active ingredient was observed when using propiconazole for the control of turf-brown spot (936.00 g/hm²) and its range of registered dosage was also the largest (180.00-936.00 g/hm²); 2) the control of banana leaf spot by epoxiconazole required the largest number of abnormal high value points, which also had the largest multiple of registered dosage (62.50-450.00 g/hm²); 3) In the control of wheat powdery mildew, the difference of the recommended active ingredient dosage of tebuconazole was the largest (51.60-262.50 g/hm²), and the number of high outliers was the largest. In order to reduce the dosage of pesticides, it is suggested that the pesticide varieties with low dosage of active ingredients (including pesticide formulations with low dosage of active ingredients and pesticide active ingredients with high bioactivity) should be prioritized for the control of crop diseases. In addition, for the same products, it is suggested that different manufacturers should determine the reasonable dosage uniformly. In the future, based on the study of the minimum effective dose of pesticides, more scientific and reasonable recommended active ingredient dosage of pesticides for specific control targets in different crops will be put forward, which will provide scientific basis for the rational reduction of pesticide application in China.