Effects of insecticides applied to control cucumber beetles (Coleoptera: Chrysomelidae) on watermelon yields     

R. E. Foster  G. E. Brust 《Crop Protection》1995,14(8):619-624

Foliar insecticides applied to control the striped and spotted cucumber beetles, Acalymma vittatum (Fab.) and Diabrotica undecimpunctata howardi Barber, on watermelon, Citrullus lanatus, were of little or no value in three studies conducted in two locations over 2 years. However, an at-planting application of the systemic, soil insecticide carbofuran resulted in higher early yields, although the differences were not statistically significant in small plots. In 1991, large plots comparing carbofuran-treated watermelons with untreated watermelons in two commercial fields showed large and statistically significant increases in melon yield when carbofuran was applied, especially in early yield. Studies in 1992 and 1993 showed that the application of carbofuran at planting stimulated root and shoot growth after transplating and increased yields when compared with untreated plots, plots treated with methyl bromide, or another soil insecticide, terbufos. These studies suggest that carbofuran may be acting as a growth stimulant, as well as an insecticide.  相似文献   

克·杀单颗粒剂的反向离子对色谱分析     

张富生  陈振华  方东白 《农药科学与管理》2002,23(3):11-13

本文采用反相离子对色谱及双通道检测分析克·杀单颗粒剂。以LichrospherRp-8不锈钢柱为色谱柱 ,0.01mol/L四丁基溴化铵 (pH=3.2) +乙腈=70+30为流动相 ,双通道检测 :杀虫单检测波长为245nm,克百威检测波长为280nm。该方法的标准偏差分别为杀虫单0.015、克百威0.0066;变异系数分别为0.79%、1.21% ;线性相关系数分别为0.9999、0.9999,平均回收率分别为99.04%、98.83%。  相似文献   

高效液相色谱柱后衍生化法检测蔬菜中涕灭威和克百威残留的方法研究   总被引：2，自引：0，他引：2  

王艳  叶一  方晓燕  刘剑  马蓉 《农药科学与管理》2009,30(9):37-40

建立了蔬菜中涕灭威和克百威残留的分析方法。样品以乙腈提取,以氨基固相萃取柱净化,甲醇∶二氯甲烷=1∶99（V/V）洗脱,以高效液相色谱柱后衍生系统,荧光检测器检测。在最佳分离条件下,涕灭威和克百威在浓度0.01～1.0mg/L范围内线性关系良好;方法检出限涕灭威为1.4μg/kg,克百威为1.7μg/kg。蔬菜样品中3个添加水平的平均回收率为涕灭威70.6%～82.0%,RSD为5.1%～12.2%;克百威88.0%～98.0%,RSD为1.3%～14.0%。该方法灵敏,准确,适用于蔬菜中涕灭威和克百威的残留检测。  相似文献   

Near‐field air concentrations of pesticides in potato agriculture in Prince Edward Island     

Christine A Garron  Kimberly C Davis  William R Ernst 《Pest management science》2009,65(6):688-696

BACKGROUND: Pesticides in air have become of increasing concern in recent years. This study examined downwind air concentrations of carbofuran, methamidophos, mancozeb and diquat dibromide resulting from spray drift within 24 h of application, within 100 m of potato fields. RESULTS: Concentrations ranged from less than 0.05 µg m^?3 in prespray samples to 6.37 µg m^?3 for methamidophos at 3 h post‐spray. For most applications, air concentrations decreased with distance from the field and with time after application. Methamidophos concentrations in the air downwind continued to increase up to 3 h after spray. Air concentrations during spray were positively correlated with application rate (r = 0.904), and air concentrations at 1 h and 3 h post‐spray were positively correlated with vapour pressure (r = 1.000 and r = 0.999 respectively). Carbofuran, methamidophos and diquat dibromide concentrations during spray were above some Canadian and international health protection guidelines. CONCLUSION: Although pesticide air concentrations measured in this study are generally consistent with other studies, maximum concentrations are greater than those that have been measured elsewhere, and some are above published air quality guidelines. An evaluation of the degree of risk posed by these and other pest control products to human and wildlife receptors is recommended. Copyright © 2009 Crown in the right of Canada. Published by John Wiley & Sons, Ltd.  相似文献   

直接竞争酶联免疫吸附分析法测定甘蔗中的克百威残留     

刘腾飞  刘曙照 《农药学学报》2010,12(3):289-293

采用包被抗体直接竞争酶联免疫吸附分析(ELISA)法测定了甘蔗中的克百威残留量。在优化条件下,对克百威标样检测的线性范围为0.000 1~1 mg/L,抑制中浓度(IC50)=3.09 μ g/L,5次重复测定的相对标准偏差(RSD)为9.3%, IC20值为0.085 μ g/L。甘蔗中分别添加克百威标样1,0.1,0.01 mg/kg,直接竞争ELISA法测定的回收率分别为86.3% ~99.1%,89.0% ~101% 和70.7% ~90.6%,RSD(n=5)分别为5.4% ,5.2% 和10.7%。ELISA法对甘蔗中克百威残留的最小检出量为6.3×10-11g,定量限可达1.26 μ g/kg。而同样前处理条件下高效液相色谱-紫外检测器(HPLC-UV)法对克百威的最小检出量为5×10-8 g,检测甘蔗中克百威残留的定量限仅为2.5 mg/kg。  相似文献   

克百威 甲基对硫磷对湘云鲫脑AchE活性恢复的影响   总被引：1，自引：0，他引：1  

林亲铁  杨仁斌  李适宇  彭晓春  戴志军 《农业环境科学学报》2003,22(1):106-108

采用体内染毒的方法 , 研究了克百威、甲基对硫磷及两者混合物对湘云鲫脑乙酰胆碱酯酶 ( AchE) 活性恢复的影响 . 结果表明 , 湘云鲫被 0.25 mg@ L- 1克百威处理 48 h后转入洁净水环境中 , 其 AchE恢复很快 , 到恢复试验 96 h, AchE基本完全恢复 ( 抑制率仅为 3% ) . 湘云鲫被 2.0 mg@ L- 1甲基对硫磷处理 48 h后 , 其 AchE恢复缓慢 , 到恢复试验 96 h, AchE抑制率还有 20.1% . 湘云鲫被 0.25 mg@ L- 1克百威与 2.0 mg@ L- 1甲基对硫磷混合物处理 48 h后 , 其 AchE恢复极为困难 , 到恢复试验 96 h, AchE抑制率还有 31.6% .  相似文献