一元二氧化氯高稳液对水稻穗颈瘟的田间防效评价

为了评价一元二氧化氯高稳液对水稻穗颈瘟的田间防控效果、并明确其施用方法,本研究采用喷雾法、通过设置不同剂量与施用次数在湖南桃江稻瘟病圃开展田间药效试验。结果表明,一元二氧化氯高稳液750 ml/hm²、1000 ml/hm²剂量喷施5次或7次对水稻穗颈瘟均有较好的防效,其中以1000 ml/hm²剂量喷施5次的防效最佳、对水稻的增产效果最明显,其防效与增产率分别达69.40%、55.21%,皆高于对照药剂40%稻瘟灵乳油1125 ml/hm²剂量喷施4次的防效与增产率,但其差异都不显著。因此,一元二氧化氯高稳液在穗颈瘟防控方面具有一定应用前景,推荐剂量为1000 ml/hm²,施用次数为3～5次,具体根据品种抗性、环境与气象条件确定。

Evaluation of the efficacy of high-stability solution of monophyletic chlorine dioxide against neck blast of paddy

In order to evaluate the efficacy of high-stability solution of monophyletic chlorine dioxide (HSSMCD) against neck blast of paddy and establish the methods of application of HSSMCD, the field trials was conducted by setting up treatments for different dosages and times of application of HSSMCD and using spray methods in rice blast nursery of Taojiang of Hunan province. The results revealed that spraying HSSMCD at dosage of 750 ml/hm_² and 1000 ml/hm_² for 5 times or 7 times all had excellent control effect against neck blast. Among them, spraying HSSMCD at dosage of 1000 ml/hm_² for 5 times had the best control effect of up to 69.40% and the highest increasing-yield rates of up to 55.21%, which were superior to the control and increasing-yield effect obtained by spraying the fungicide Isoprothiolane 40% EC at dosage of 1125 ml/hm_² for 4 times, but being no significant difference between them. Therefore, HSSMCD is a promising choice against neck blast because of its excellent control effect, and the dosage of 1000 ml/hm_² for 3 to 5 times of application was recommended according to resistance of rice varieties, planting environment and weather condition.