| 摘要: |
| 【目的】探明激健、GY-T1602、GY-Tmax、AS-100、青皮桔油和高捷仕6种农药助剂对40%丁香·戊唑醇悬浮剂在玉米叶片上湿润性能及药效的影响，筛选防治玉米大斑病的高效助剂。【方法】采用表面张力仪，测定加入激健、GY-T1602、GY-Tmax、AS-100、青皮桔油和高捷仕6种助剂后，被稀释为体积分数0.2%，0.1%和0.05%的40%丁香·戊唑醇药液的表面张力值；再使用接触角测量仪测定加入各助剂的体积分数0.2%的40%丁香·戊唑醇药液在玉米叶片上0～60 s的动态接触角和30 s静态接触角，筛选出适宜玉米田杀菌剂使用的喷雾助剂；通过盆栽试验，进一步探究各助剂对丁香·戊唑醇药液防治玉米大斑病效果的影响。【结果】体积分数为0.2%，0.1%和0.05%的40%丁香·戊唑醇未加入助剂时表面张力为34.61～40.13 mN/m，分别加入体积分数为0.2%激健、0.1% GY-T1602、0.3% GY-Tmax、0.2 AS-100、0.06%青皮桔油和0.5%高捷仕后，药液表面张力分别降低为24.48～26.85，24.91～27.13，27.37～30.33，29.62～31.37，29.15～32.33和29.41～33.18 mN/m，各处理药液表面张力均随着40%丁香·戊唑醇体积分数的降低而增大，其中加入0.2%激健和0.1% GY-T1602后药液的表面张力小于玉米叶片的临界表面张力，说明二者对提高40%丁香·戊唑醇悬浮剂在玉米叶片上湿润性能的效果最好。与未加入助剂相比，加入6种助剂后40%丁香·戊唑醇溶液接触到玉米叶片30 s时的静态接触角均减小，其中加入0.2%激健和0.1% GY-T1602后药液在接触到玉米叶片30 s时的静态接触角分别为25.82°和30.85°，下降幅度最明显，效果最佳；各处理药液的动态接触角均随着与玉米叶片接触时间的延长呈下降趋势，0～30 s时降幅较大，30～60 s时降幅趋缓，加入各助剂后药液的初始接触角即较未加入助剂药液明显下降。盆栽试验结果表明，6种助剂的加入均对40%丁香·戊唑醇悬浮剂防治玉米大斑病起到了增效作用，其中40%丁香·戊唑醇悬浮剂用量为300 g/hm2时，加入0.2%激健和0.1% GY-T1602对玉米大斑病的防效分别提升了17.72%和14.86%，增效作用明显。【结论】6种助剂中激健和GY T1602对增强40%丁香·戊唑醇悬浮剂在玉米叶片的湿润展布效果最好，对防治玉米大斑病的增效作用最大。 |
| 关键词: 40%丁香·戊唑醇悬浮剂 喷雾助剂 表面张力 临界张力值 |
| DOI： |
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| 基金项目:吉林省科技厅科技攻关项目（20190301063NY）；国家重点研发计划支持项目（2016YFD0200203） |
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| Effect of adjuvants on wetting performance and efficacy of coumoxystrobin and tebuconazol 40% SC on corn leaves |
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PAN Wenxuan,WANG Suo,GAO Ning,et al
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| Abstract: |
| 【Objective】This study investigated effects of pesticide additives including Jijian,GY-T1602,GY-Tmax,AS-100,Green peel orange oil and Gao Jieshi on wetting performance on corn leaves and medicinal effects of coumoxystrobin and tebuconazol 40% SC to help choose high efficiency additives.【Method】Using a surface tensiometer,the surface tension values of coumoxystrobin and tebuconazol 40% SC solution diluted to 0.2%,0.1% and 0.05% after adding 6 additives were measured.Then,a contact angle measuring instrument was used to measure dynamic contact of coumoxystrobin and tebuconazol 40% SC liquid with 0.2% volume fraction of each additive on corn leaves for 0-60 s angle and 30 s static contact angle.The suitable spray additives for corn field fungicides were selected and effects of additives on pesticide control were further explored through pot experiment.【Result】The surface tension of coumoxystrobin and tebuconazol 40% SC with volume fractions of 0.2%,0.1% and 0.05% without additives was 34.61-40.13 mN/m.The surface tension decreased to 24.48-26.85,24.91-27.13,27.37-30.33,29.62-31.37,29.15-32.33 and 29.41-33.18 mN/m after adding 0.2% Jijian,0.1% GY-T1602,0.3% GY-Tmax,0.2% AS-100,0.06% Green peel orange oil and 0.5% Gao Jieshi.The surface tension of each treatment increased with the decrease of volume fraction of coumoxystrobin and tebuconazol 40% SC.The surface tension after adding 0.2% Jijian and 0.1% GY T1602 was less than the corn critical surface tension,indicating that the two had the best effect on improving wetting performance.Compared with no additives,adding 6 additives reduced the static contact angle of coumoxystrobin and tebuconazol 40% SC solution contacted with corn leaves for 30 s.Among them,adding 0.2% Jijian and 0.1% GY-T1602 changed static contact angles touching corn leaves for 30 s to 25.82° and 30.85°,showing the best effect.The dynamic contact angle of each liquid decreased with the prolongation of contact time with larger decrease at 0-30 s and slower decrease at 30-60 s.The initial contact angle after adding additives was significantly lower than that without additives.The pot experiment results showed that addition of all 6 additives played a synergistic effect on coumoxystrobin and tebuconazol 40% SC in preventing and curing corn leaf spot disease.When coumoxystrobin and tebuconazol 40% SC was 300 g/hm2,adding 0.2% Jijian and 0.1% GY-T1602 increased the prevention of corn leaf spot disease by 17.72% and 14.86% with significant synergistic effects.【Conclusion】Among the six adjuvants,Jijian and GY-T1602 had the best effect on enhancing wet spread of coumoxystrobin and tebuconazol 40% SC on corn leaves and the greatest synergistic effect on prevention and control of corn leaf spot. |
| Key words: coumoxystrobin and tebuconazol 40% SC spray additives surface tension critical surface tension |
