Synergistic effect of two spray adjuvants on thiamethoxam in the control of Megalurothrips usitatus in cowpea
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摘要: 为探索有机硅助剂Silwet stik和植物油助剂迈丝对噻虫嗪防治豇豆上蓟马 Megalurothrips usitatus的效果及其残留行为的影响,通过田间试验,比较了25%噻虫嗪水分散粒剂 (WG) 在登记剂量和减量10%、20%、30%条件下分别添加两种助剂后5 d和7 d的防效,以及施药后噻虫嗪及其代谢物噻虫胺在豇豆上的消解动态与残留量。豇豆样品采用乙腈提取,经N-丙基乙二胺 (PSA) 净化,高效液相色谱-串联质谱 (HPLC-MS/MS) 检测,外标法定量。田间试验结果显示:添加体积分数0.4% 的Silwet stik和0.5% 的迈丝助剂均能显著增加噻虫嗪在豇豆上的原始沉积量;施用25%噻虫嗪WG后7 d,添加助剂Silwet stik或迈丝的处理对豇豆上蓟马的防治效果均显著高于未添加助剂的处理,分别提高了8.84%和6.58%;登记剂量减少10%~30%情况下,添加Silwet stik或迈丝,施药5 d后的防效均高于未添加助剂的处理,分别提高4.04%~8.55%和10.37%~12.25%。研究表明,添加Silwet stik和迈丝两种助剂均能提高噻虫嗪在豇豆上的沉积量,提高对豇豆上蓟马的防治效果。结果可为噻虫嗪防治豇豆上蓟马的科学使用提供依据。Abstract: Organosilicon adjuvant Silwet stik and vegetable oil adjuvant Maisi were selected to conduct field experiments with thiamethoxam to verify the preventive effect on cowpea thrips and residual behavior. Dissipation dynamic and residues of recommended application dose 75, 67.5, 60, and 52.5 g a.i/hm2 of 25% thiamethoxam water dispersible granules (WG) with two different adjuvants were compared respectively and the preventive effect of 5 and 7 days after the last spray was investigated. The cowpea samples were extracted by acetonitrile, purified with primary secondary amine (PSA), and detected using high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). The results of field tests indicated that the initial deposition of thiamethoxam on cowpea were significantly increased by 8.84% and 6.58% respectively when the adjuvant 0.4% Silwet stik or 0.5% Maisi was added. The control effect against cowpea thrips of 25% thiamethoxam WG added with the two adjuvants above were significantly higher than that without adjuvant 7 days after treatments. Five days after treatments, the addition of adjuvant Silwet stik or Maisi increased preventive effect by 4.04%-8.55% and 10.37%-12.25% respectively, while the recommended application dose of thiamethoxam was reduced by 10%-30%. The results showed that the adjuvant treatments increased the deposition of thiamethoxam on cowpea, which would benefit the synergistic effect of pesticide, and improved control effect on thrips. The study provides evidence for the synergistic control effect of adjuvants and the scientific use of thiamethoxam against cowpea thrips.
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表 1 药效与残留田间试验设计
Table 1. Design of efficacy test and residue test
处理
Treatment有效成分施药剂量
Application dose,
a.i./(g/hm2)药效调查时间
Time of efficacy
investigation/
d残留采样间隔期
Time of residue
sampling interval/
d登记剂量
Registration dose75 5, 7 0 (2 h), 1, 3, 5, 7, 10 登记剂量 + 0.4% Silwet stik
Registration dose + 0.4% Silwet stik75 90% 登记剂量 + 0.4% Silwet stik
90% registration dose + 0.4% Silwet stik67.5 80% 登记剂量 + 0.4% Silwet stik
80% registration dose + 0.4% Silwet stik60 70% 登记剂量 + 0.4% Silwet stik
70% registration dose + 0.4% Silwet stik52.5 登记剂量 + 0.5% 迈丝
Registration dose + 0.5% Maisi75 90% 登记剂量 + 0.5% 迈丝
90% registration dose + 0.5% Maisi67.5 80% 登记剂量 + 0.5% 迈丝
80% registration dose + 0.5% Maisi60 70% 登记剂量 + 0.5% 迈丝
70% registration dose + 0.5% Maisi52.5 表 2 噻虫嗪和噻虫胺质谱测定参数
Table 2. MS parameters for the detection of thiamethoxam and clothianidin
农药
Pesticide定量离子对
Quantitative ion pair, m/z定性离子对
Qualitative ion pair, m/z驻留时间
Dwell time/msQ1 预杆偏差
Q1 pre bias/V碰撞能量
CE/eVQ3 预杆偏差
Q3 pre bias/V噻虫嗪 thiamethoxam 292.00>211.10 292.00>211.10 50.0 −15.0 −12.0 −22.0 292.00>181.15 50.0 −22.0 −21.0 −19.0 噻虫胺 clothianidin 250.10>169.10 250.10>169.10 50.0 −17.0 −12.0 −17.0 250.10>132.05 50.0 −27.0 −15.0 −25.0 表 3 噻虫嗪和噻虫胺在豇豆样品中的添加回收率及相对标准偏差(n=5)
Table 3. Average recovery, relative standard deviation of thiamethoxam and clothianidin in cowpea (n=5)
农药
Pesticide添加水平
Spiked level/(mg/kg)平均回收率
Average recovery/%相对标准偏差
RSD/%噻虫嗪
thiamethoxam0.01 101 2.8 0.1 96 3.5 1 89 4.3 噻虫胺
clothianidin0.01 86 3.6 0.1 91 4.5 1 95 5.1 表 4 25%噻虫嗪水分散粒剂对豇豆上蓟马的田间防治效果
Table 4. Result of field trial test of 25% thiamethoxam WG against Megalurothrips usitatus in cowpea
处理
Treatment施药前虫口基数
Population base before application5 d 7 d 残虫数
No. of insects防效
Control efficacy/%残虫数
No. of insects防效
Control efficacy/%登记剂量
Registration dose146 87 69.34±5.43 a 87 77.61±7.79 ab 登记剂量 + 0.4% Silwet stik
Registration dose + 0.4% Silwet stik147 45 81.25±3.66 abc 48 86.45±8.39 c 90% 登记剂量 + 0.4% Silwet stik
90% Registration dose + 0.4% Silwet stik115 54 73.38±12.32 abc 66 76.93±1.34 ab 80% 登记剂量 + 0.4% Silwet stik
80% Registration dose + 0.4% Silwet stik126 54 77.89±4.22 abc 78 75.23±9.17 ab 70% 登记剂量 + 0.4% Silwet stik
70% Registration dose + 0.4% Silwet stik144 70 74.98±3.54 abc 99 72.19±3.58 a 登记剂量 + 0.5% 迈丝
Registration dose + 0.5% Maisi133 41 84.33±7.10 bc 52 84.19±2.65 c 90% 登记剂量 + 0.5% 迈丝
90% Registration dose + 0.5% Maisi149 45 81.59±2.91 abc 66 81.61±6.04 bc 80% 登记剂量 + 0.5% 迈丝
80% Registration dose + 0.5% Maisi142 55 79.71±12.31 abc 80 78.16±5.02 ab 70% 登记剂量 + 0.5% 迈丝
70% Registration dose + 0.5% Maisi145 51 81.08±12.71 abc 82 74.74±12.61 ab 注:表中数据为平均值±标准差 (n = 5)。同列数据后不同小写字母表示差异显著 (P<0.05)。
Notes: Data in the table are mean±SD (n = 5). Different lowercase letters indicate significant difference among the same column data (P<0.05).表 5 噻虫嗪在豇豆中的消解动力学参数
Table 5. Dissipation kinetic parameters of thiamethoxam in cowpea
处理
Treatment原始沉积量
Original residue/(mg/kg)消解动态方程
Dissipation dynamics equation相关系数
Correlation coefficient, r半衰期
Half-life
/d登记剂量
Registration dose0.64±0.07 a ct = 0.9422e−0.435t 0.9626 1.6 登记剂量 + 0.4% Silwet stik
Registration dose + 0.4% Silwet stik0.99±0.16 c ct =0.9182e−0.432t 0.9800 1.6 90% 登记剂量 + 0.4% Silwet stik
90% registration dose + 0.4% Silwet stik0.82±0.10 b ct = 0.9006e−0.316t 0.9789 2.2 80% 登记剂量 + 0.4% Silwet stik
80% registration dose + 0.4% Silwet stik0.67±0.09 ab ct = 0.7306e−0.370t 0.9754 1.9 70% 登记剂量 + 0.4% Silwet stik
70% registration dose + 0.4% Silwet stik0.60±0.10 a ct = 0.7105e−0.434t 0.9529 1.6 登记剂量 + 0.5% 迈丝
Registration dose + 0.5% Maisi0.91±0.07 b ct =0.8318e−0.302t 0.9611 2.3 90% 登记剂量 + 0.5% 迈丝
90% registration dose + 0.5% Maisi0.66±0.08 ab ct=0.8303e−0.422t 0.9707 1.6 80% 登记剂量 + 0.5% 迈丝
80% registration dose + 0.5% Maisi0.62±0.07 a ct =0.7036e−0.410t 0.9901 1.7 70% 登记剂量 + 0.5% 迈丝
70% registration dose + 0.5% Maisi0.53±0.06 a ct =0.6774e−0.412t 0.9645 1.7 注:表中数据为平均值±标准差 (n = 3)。同列数据后不同小写字母表示差异显著 (P<0.05)。Notes: Data in the table are mean±SD (n = 3). Different lowercase letters indicate significant difference among the same column data (P<0.05). 表 6 噻虫嗪和噻虫胺在豇豆中的最终残留
Table 6. The terminal residue of thiamethoxam & clothianidin in cowpea
处理
Treatment残留量 Residues/(mg/kg) 药后 3 d
3 d after treatment药后 5 d
5 d after treatment噻虫嗪
thiamethoxam噻虫胺
clothianidin噻虫嗪
thiamethoxam噻虫胺
clothianidin登记剂量
Registration dose0.422±0.014 0.011±0.001 0.138±0.022 <0.01 登记剂量 + 0.4% Silwet stik
Registration dose + 0.4% Silwet stik0.297±0.023 0.033±0.004 0.131±0.020 <0.01 90% 登记剂量 + 0.4% Silwet stik
90% registration dose + 0.4% Silwet stik0.355±0.015 0.011±0.002 0.202±0.007 <0.01 80% 登记剂量 + 0.4% Silwet stik
80% registration dose + 0.4% Silwet stik0.336±0.022 0.011±0.003 0.123±0.010 <0.01 70% 登记剂量 + 0.4% Silwet stik
70% registration dose + 0.4% Silwet stik0.293±0.021 0.012±0.003 0.124±0.005 <0.01 登记剂量 + 0.5% 迈丝
Registration dose + 0.5% Maisi0.325±0.015 0.011±0.003 0.223±0.008 <0.01 90% 登记剂量 + 0.5% 迈丝
90% registration dose + 0.5% Maisi0.339±0.016 0.012±0.004 0.144±0.011 <0.01 80% 登记剂量 + 0.5% 迈丝
80% registration dose + 0.5% Maisi0.211±0.010 0.011±0.004 0.123±0.007 <0.01 70% 登记剂量 + 0.5% 迈丝
70% registration dose + 0.5% Maisi0.323±0.018 0.009±0.003 0.121±0.006 <0.01 注:表中数据为平均值±标准差 (n = 3)。Note: Data in the table are mean±SD (n = 3). -
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