Abstract: To investigate the synergistic enhancement effect of different adjuvants on the control of rice false smut by tebuconazole，seven novel adjuvants were selected including Nanosilica（NMG），Mairun（MR），Keousen（KOS），Maifei（MF），Benniu（BN），Jijian（JJ），and Chaoniu（CN）.Firstly，the improvement in spreading performance of reduced tebuconazole by the addition of adjuvants was quantitatively analyzed using the contact angle measurement method. Subsequently，greenhouse pot experiments with artificial inoculation and fungicide spraying，as well as field trials under natural conditions，were conducted.A comprehensive evaluation of the synergistic control effect of reduced tebuconazole with adjuvants was performed.The results showed that after 50% reduction of tebuconazole combined with each adjuvant，the contact angle of the solution on rice leaves significantly decreased，and the spreading performance was markedly improved.Under conditions of artificial inoculation with rice false smut，adding the seven adjuvants to 50% reduced tebuconazole increased the disease inhibition by 18.0% to 71.3% compared with the single 50% reduced tebuconazole treatment.Among them，the CN combination treatment exhibited the best inhibition effect，with a inhibition rate of 85.5%.Field control results indicated that 30% reduced tebuconazole combined with CN achieved the highest control efficacy against rice false smut，reaching 87.1%，which showed a significant increase of 48.6% compared with the 30% reduced tebuconazole alone and was comparable to the standard tebuconazole dose alone（86.6%）.In addition，the control efficacy of 30% reduced tebuconazole combined with MF，JJ，MR，or BN showed no significant difference compared with the standard tebuconazole dose alone.These results indicate that the addition of novel adjuvants can achieve enhanced control efficacy with reduced fungicide dosage against rice false smut，and the nanoscale CN adjuvant shows particularly pronounced synergistic effects，providing a basis for environmentally friendly disease management in rice.

Key words: Rice false smut, Adjuvant, Tebuconazole, Contact angle, Reduction and synergistic effect, Field control efficacy

摘要： 为探究不同助剂对戊唑醇防治稻曲病的协同增效作用，选取纳米硅（NMG）、迈润（MR）、克欧森（KOS）、迈飞（MF）、犇牛（BN）、激健（JJ）、超牛（CN）7种新型助剂，首先通过接触角测定法量化分析添加助剂对戊唑醇减量后铺展性能的改善效果，进而采用温室盆栽人工接种稻曲病菌+药剂喷施试验和自然条件下田间防控试验，综合评价戊唑醇减量添加助剂的协同防控效果。结果表明，戊唑醇减量50%复配各助剂后，药液在稻叶表面的接触角较不添加助剂显著降低，铺展性能显著提高。人工注射接种稻曲病菌条件下，戊唑醇减量50%添加7种助剂可使稻曲病抑制能力较单剂减量50%处理提高18.0%~71.3%，其中复配CN处理抑制效果最好，抑制率达85.5%。田间防控试验结果显示，戊唑醇减量30%添加助剂CN对稻曲病的防效最高，达87.1%，较戊唑醇减量30%处理极显著提升48.6%，与戊唑醇常规剂量单剂处理（86.6%）相当；此外，戊唑醇减量30%添加MF、JJ、MR、BN 4种助剂处理的防效与戊唑醇常规剂量单剂也无显著差异。可见，添加新型助剂可在稻曲病防控中实现杀菌剂减量增效，其中纳米载体CN助剂减量增效显著，为水稻病害绿色防控提供了依据。

关键词: 稻曲病, 助剂, 戊唑醇, 接触角, 减量增效, 田间防效