杨帆, 杨绍丽, 陈浩, 王攀, 望勇, 彭斌, 司升云. 不同助剂提高烯酰吗啉防治莴苣霜霉病的效果研究[J]. 农药学学报, 2021, 23(1): 168-175. DOI: 10.16801/j.issn.1008-7303.2020.0131
    引用本文: 杨帆, 杨绍丽, 陈浩, 王攀, 望勇, 彭斌, 司升云. 不同助剂提高烯酰吗啉防治莴苣霜霉病的效果研究[J]. 农药学学报, 2021, 23(1): 168-175. DOI: 10.16801/j.issn.1008-7303.2020.0131
    YANG Fan, YANG Shaoli, CHEN Hao, WANG Pan, WANG Yong, PENG Bin, SI Shengyun. Study on the effect of different adjuvants on dimethomorph against lettuce downy mildew[J]. Chinese Journal of Pesticide Science, 2021, 23(1): 168-175. DOI: 10.16801/j.issn.1008-7303.2020.0131
    Citation: YANG Fan, YANG Shaoli, CHEN Hao, WANG Pan, WANG Yong, PENG Bin, SI Shengyun. Study on the effect of different adjuvants on dimethomorph against lettuce downy mildew[J]. Chinese Journal of Pesticide Science, 2021, 23(1): 168-175. DOI: 10.16801/j.issn.1008-7303.2020.0131

    不同助剂提高烯酰吗啉防治莴苣霜霉病的效果研究

    Study on the effect of different adjuvants on dimethomorph against lettuce downy mildew

    • 摘要: 为研究不同喷雾助剂提高烯酰吗啉防治莴苣霜霉病的效果,采用喷雾法测定了有机硅助剂Silwet 408、阴离子表面活性剂捷成、植物源助剂克欧森和怀农特4种助剂对50%烯酰吗啉可湿性粉剂在莴苣上的沉积率及对霜霉病防治效果的影响。烯酰吗啉不添加助剂以及分别添加4种助剂后,第1次施药后1 d在莴苣植株内的沉积量分别为4.10、5.71、6.24、9.18和7.41 mg/kg,沉积率分别为26.35%、36.73%、40.08%、59.01%和47.63%;第2次施药后7 d对霜霉病的田间防治效果分别为63.82%、89.90%、77.84%、76.35%和76.94%。分别在不同浓度的烯酰吗啉中添加克欧森,烯酰吗啉按推荐剂量减量10%,药剂在莴苣上的最大沉积量和沉积率均显著高于对照,对霜霉病的防治效果无显著差异;减量20%处理与对照相比也均无显著差异;而减量30%处理则均显著低于对照。研究结果表明:4种喷雾助剂均可提高烯酰吗啉的药效,其中植物源助剂对提高烯酰吗啉沉积率的作用最强,而有机硅表面活性剂对提高霜霉病防治效果的作用最强;在保证烯酰吗啉沉积率和防治效果不降低的前提下,添加一定浓度的植物源助剂可以减少10%~20%的农药用量。

       

      Abstract: The influence of four adjuvants, including organosilicon surfactant Silwet 408, anionic surfactant Jiecheng, vegetable oils Coerce and WETCIT, on the effective utilization and bioactivity of dimethomorph 50% WP against lettuce downy mildew was conducted by spraying method. The deposition rates of dimethomorph without adjuvants, and with Silwet 408, Jiecheng, Coerce and WETCIT were 4.10, 5.71, 6.24, 9.18 and 7.41 mg/kg, respectively, 1 day after the first application, and the deposition rates of dimethomorph on lettuce plant were 26.35%, 36.73%, 40.08%, 59.01% and 47.63%, respectively. The field control efficacy of dimethomorph against lettuce downy mildew, 7 days after the second application, were 63.82%, 89.90%, 77.84%, 76.35% and 76.94%, respectively. The maximum deposition and deposition rates after the treatment of dimethomorph (recommended dosage reduced by 10%) with Coerce were significantly higher than those after the treatment of dimethomorph for recommended dose and without Coerce (control group). And no significant difference was found in the control effect of downy mildew. There were no significant difference between the treatment of dimethomorph (recommended dosage reduced by 20%) with Coerce and the control group. However, the treatment of dimethomorph (recommended dosage reduced by 30%) with Coerce were significantly decreased than the control group. The results indicated that all the tested spray adjuvants showed certain synergistic effect on dimethomorph. Vegetable oils had strongest effect on increasing the deposition rate of dimethomorph, while organosilicon surfactants had strongest effect on improving the bioactivity of dimethomorph against lettuce downy mildew. While ensure the effective utilization and control effect, adding a certain concentration of spray adjuvant can reduce the use of pesticides by 10%-20%.

       

    /

    返回文章
    返回