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采用五点取样法进行华安铁观音茶炭疽病的发生规律调查,利用喷雾法进行田间药效筛选试验研究。调查结果显示,铁观音茶炭疽病在华安1年发生3次。药效试验结果表明,第1次施药后,6种药剂的防治效果大小依次为30%醚菌酯可湿性粉剂、450g·L-1咪鲜胺水乳剂、50%氯溴异氰尿酸可溶性粉剂、25%丙环唑乳油、70%甲基托布津可湿性粉剂、70%福美双可湿性粉剂;第2次施药后,防效大小依次为30%醚菌酯可湿性粉剂、25%丙环唑乳油、450g·L-1咪鲜胺水乳剂、70%甲基托布津可湿性粉剂、50%氯溴异氰尿酸可溶性粉剂、70%福美双可湿性粉剂。综合试验结果认为,30%醚菌酯对炭疽病防治效果最好且具有较好的持效性。
The five-point sampling method was used to investigate the occurrence regularity of anthracnose in tea in Guan’an Tie Guan Yin, and the field efficacy test was conducted by spraying method. The survey results show that Tie Guan Yin anthracnose occurs in Huaan 3 times a year. The results of the efficacy test showed that after the first application, the prevention and control effects of the six pesticides were as follows: 30% ketoxystrobin WP, 450 g · L-1 prochloraz water emulsion, 50% bromochloroisocyanuric acid soluble 25% propiconazole EC, 70% thiophanate-methyl WP and 70% thiram WP. After the second application, the control effects were as follows: 30% Ketoconazole wettable powder, 25% Propiconazole EC, 450 g · L-1 prochloraz water emulsion, 70% thiophanate-methyl wettable powder, 50% bromochloroisocyanuric acid soluble powder and 70% thiram wettable powder. According to the comprehensive test results, 30% kresoxim-methyl was the best and effective in controlling anthracnose.