芪蓝抗毒饮治疗鸡传染性法氏囊病的剂量研究     

邢玉娟  陈玉库  胡元亮  张宝康  刘家国  钱建飞  李银  张则斌  唐余华 《中兽医医药杂志》2003,22(6):14-16

比较了芪蓝抗毒饮三种剂量和中剂量三种给药次数对雏鸡实验性传染性法氏囊病的疗效。结果表明，中剂量和发病后该剂量每天给药1次、连续4天的疗效最好。  相似文献   

麦蚜对吡虫啉的敏感性及吡虫啉有效用量的评价   总被引：1，自引：0，他引：1  

刘爱芝  王晓军  李素娟  武予清  李巧丝 《植物保护》2002,28(3):15-18

室内测定结果表明 ,禾谷缢管蚜对吡虫啉的敏感性比麦长管蚜高 ,其LC₅₀之比为1∶3左右。田间试验结果明确 ,吡虫啉持效性好 ,其持效期与吡虫啉用量和麦蚜种类有关。小麦穗蚜发生始盛期是吡虫啉防治麦蚜的最佳时期 ,防治禾谷缢管蚜最佳有效用药量为1g/667m²,麦长管蚜为2g/667m²。  相似文献   

一种监测棉铃虫对Bt杀虫晶体蛋白抗性的技术   总被引：1，自引：0，他引：1  

范贤林  芮昌辉  孟香清  梁桂梅  李永平 《植物保护学报》2002,29(3):254-258

研究了以诊断试剂盒监测棉铃虫对苏云金杆菌(Bt)杀虫晶体蛋白(ICP)抗性的技术。将1日龄幼虫在含诊断剂量的饲料中(每毫升饲料含Bt ICP0.01mg)取食7天,以生长至3龄以上的个体作为抗性个体的判断指标;筛选出人工饲料中防腐剂剂量的最佳值为每350毫升饲料中含丙酸2.5ml。经对多个棉铃虫不同抗性种群的验证试验,证明诊断试剂盒检测抗性个体频率较为精确且应用简便。  相似文献   

Effect of air temperature, rain and drought on hot water weed control   总被引：1，自引：1，他引：1  

D Hansson  & J E Mattsson 《Weed Research》2003,43(4):245-251

The influence of rain and drought before, and air temperature during, weed control with hot water was studied in laboratory experiments on the test weed Sinapis alba (white mustard). The plants were grown in a greenhouse and treated outdoors. There was no difference in weed control effect when S. alba plants at the four‐leaf stage were treated at the air temperatures 7°C and 18^°C. The effective energy dose for a 90% fresh weight reduction was 465 kJ m^?2 for both air temperatures. Weed control of S. alba at the four‐ to six‐leaf stage in rainfall above the rainwater run‐off level increased the required effective energy dose by 20% (i.e. 120 kJ m^?2) compared with dry plants. A short period of drought just before treatment on S. alba at the two‐ to four‐leaf stage increased the plant fresh weight reduction, which was 22% at low energy dose (190 kJ m^?2) and 44% at high energy dose (360 kJ m^?2). Hot water weed control should thus be carried out when the plants are drought stressed and avoided when the plants are wet. The air temperature seems to be of little importance in the range 7–18^°C.  相似文献   

Changes in the abundance of weeds in spring cereal fields in Finland     

T Hyvönen  E Ketoja†  & J Salonen 《Weed Research》2003,43(5):348-356

  相似文献   

Predicting effective doses for the joint action of two fungicide applications   总被引：1，自引：0，他引：1  

N. D. Paveley †  J. M. Thomas  T. B. Vaughan  N. D. Havis  D. R. Jones 《Plant pathology》2003,52(5):638-647

A function was derived to predict fungicide efficacy when more than one application of a single active ingredient is made to a crop, given parameters describing the dose–response curves of the component single-spray applications. In the function, a second application is considered to act on that proportion of the total pathogen population which was uncontrollable at the time of the first application (represented by the lower asymptote of the dose–response curve for the first treatment), plus any additional part of the population which survived the first application as a result of a finite dose being applied. Data to estimate the single-spray dose–response curve parameters and validate predictions of two-spray programme efficacy were obtained from separate subsets of treatments in four field experiments. A systemic fungicide spray was applied to wheat at a range of doses, at one or both of two times (t₁ and t₂), in all dose combinations. Observed values of the area under the disease progress curve (AUDPC) for septoria leaf blotch (Mycosphaerella graminicola) were used to construct response surfaces of dose at t₁ by dose at t₂ for each culm leaf layer. Parameters were estimated from single-spray and zero-dose treatment data only. The model predicted a high proportion (R² = 71–95%) of the variation in efficacy of the two-spray programmes. AUDPC isobols showed that the dose required at t₂ was inversely related to the dose at t₁, but the slope of the relationship varied with the relative timings of t₁ and t₂ in relation to culm leaf emergence. Isobols were curved, so the effective dose – the total dose required to achieve a given level of disease suppression – was lower when administered as two applications.  相似文献   

狂犬病毒中和抗体检测试验中病毒回归试验的重要性     

陈先国  支海兵  滕颖  吴华伟  刘金玲 《中国兽药杂志》2004,38(4):22-24

狂犬病毒中和试验的病毒回归试验表明,病毒攻毒液的实际剂量与理论剂量不完全一致.建议在新版<中华人民共和国兽用生物制品质量标准>中增加对病毒攻毒实际剂量范围的规定,以使结果的判定更为合理.  相似文献   

治疗仔猪黄白痢中兽药临床处方筛选     

夏鑫超  王胜义  王慧  齐志明  刘世祥  牛煦  王海军  刘永明 《黑龙江畜牧兽医》2014,(4):84-87

为了筛选出治疗仔猪黄白痢的最佳中药处方，确定其合理用药剂量和适用范围，试验将478头确诊为黄白痢的哺乳仔猪随机分为6组，分别用3种预选处方（处方一、处方二和处方三）、氧氟沙星、诺氟沙星、氧氟沙星与诺氟沙星联合用药进行治疗，比较预选处方与对照药物对仔猪黄白痢的治疗效果，筛选最佳的中药处方；并对每种中药处方按照低、中、高3种剂量进行用药，确定预选处方的合理用药剂量；按照发病特点进行用药。探讨预选处方对不同病症的适用性。结果表明：预选处方对仔猪黄白痢的治疗效果优于对照药物，且复发率显著低于后者；3种中药处方中，处方一的疗效最好，治愈率为82．9％，总有效率可迭84．7％，显著高于其他处方；处方一中剂量组的疗效最好，治愈率为88．9％，总有效率可达91．1％，显著高于其他剂量组，而且治愈后无复发现象。  相似文献   

Hormetic effect of glyphosate persists during the entire growth period and increases sugarcane yield     

Renata P Pincelli‐Souza  Fernanda PAP Bortolheiro  Caio A Carbonari  Edivaldo D Velini  Marcelo de A Silva 《Pest management science》2020,76(7):2388-2394

  相似文献   

Application of imidacloprid controlled-release granules to enhance the utilization rate and control wheat aphid on winter wheat          下载免费PDF全文

YUAN Wan-ling  XU Bo  RAN Gang-chao  CHEN Hui-ping  ZHAO Peng-yue  HUANG Qi-liang 《农业科学学报》2020,19(12):3045-3053

During winter wheat production, aphids need to be controlled with pesticides for the entire growth period. Controlled-release technology has been regarded as an alternative method for the improvement of pesticide efficiency. This study investigated two types of imidacloprid controlled-release granule (CR-GR): 2% imidacloprid CR-GR and 0.2% imidacloprid pesticide-fertilizer controlled-release granule (PF-CR-GR) when wheat was sown in winter. The release performance, utilization rate, terminal residues in edible parts, control effect on aphids, and achieved winter wheat yield were evaluated for both laboratory experiments and field application. Imidacloprid PF-CR-GR released more quickly in aqueous medium than CR-GR because of its good water solubility. After CR-GR treatments, the concentrations in wheat roots and soil were similar throughout the entire sampling period, and the concentrations in shoots were about 10–20% of those in roots. Imidacloprid was better absorbed when CR-GR was used as root treatment, compared with foliar treatment. Field application showed that imidacloprid CR-GR and PF-CR-GR controlled aphids throughout the entire growth period of winter wheat and improved the wheat yield. These findings identified application of imidacloprid CR-GR and PF-CR-GR on winter wheat as an effective way to enhance the pesticide utilization rate and ensure adequate yield. This paper provides a theoretical basis for the scientific use of pesticides and guides scientific pesticide application.  相似文献