9种杀菌剂对新疆荒漠绿洲稻区水稻稻瘟病的防治效果评价

【目的】筛选防治稻瘟病的田间药剂,为新疆水稻稻瘟病的科学防治提供指导。【方法】采用随机区组的方法,定点调查各处理稻瘟病发生情况,评价供试药剂对稻瘟病的防治效果。【结果】药后14 d,75%三环唑WP 225 g a. i/hm²处理和325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm²处理对水稻稻瘟病的防效最高,分别为72.63%和71.77%;其次是2%春雷霉素SL 30 g a. i/hm²处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm²处理,对水稻稻瘟病防效分别为61.48%和61.27%。各药剂处理对水稻生长发育无异常影响、无药害。【结论】75%三环唑WP 225 g a. i/hm²处理、325 g/L苯甲·嘧菌酯SC 243.75 g a. i/hm²处理、2%春雷霉素SL 30 g a.i/hm²处理和500 g/L甲基硫菌灵SC 1 125 g a. i/hm²处理,可有效控制水稻稻瘟病的发生与危害,且对水稻生长安全,可在大田合理轮换使用。

Evaluation of Controlling Effects of 9 Fungicides against Rice Blast in Oasis Rice Zone of Xinjiang Desert Region

【Objective】 The aim of present study is to conduct experiments to screen fungicides in the hope of providing guidance for scientific control of rice blast in Xinjiang.【Method】Randomized block design was used to investigate the occurrence of rice blast at fixed spots, and the effect of fungicides on rice blast was evaluated.【Result】The result showed that, fourteen days after fungicides were used, the treatments of 75% tricyclazole WP with the dosage of 225 g a. i/hm², 325 g/L difenoconazole-azoxystrobin SC with the dosage of 243.75 g a. i/hm², 2% kasugamycin SL with the dosage of 30 g a. i/hm² and 500 g/L thiophanate-methyl SC with the dosage of 1,125 g a. i/hm² had better effect on Magnaporthe oryzae, and their control effects were 72.63%, 71.77%, 61.48%, 61.27%, respectively. There was no abnormal effect on the growth and development of rice treated with various insecticides and no drug damage was found in all the treatments.【Conclusion】The control effects of 75% tricyclazole WP with the dosage of 225 g a. i/hm², 325 g/L difenoconazole-azoxystrobin SC with the dosage of 243.75 g a. i/hm², 2% kasugamycin SL with the dosage of 30 g a. i/hm² and 500 g/L thiophanate-methyl SC with the dosage of 1,125 g a. i/hm² were quite effective to control rice blast and safe to the growth of rice, so it was strongly suggested that they could be applied alternately in rice production in the field.