Ecotoxicological potential of bordeaux mixture and Neem oil on non-target soil organisms

V.M.D. Rosa, R.N. Scoriza, M.E.F. Correia, D. Baretta
2017 Revista Brasileira de Ciências Agrárias  
The use of alternative pesticides has as main function to maximize agricultural production with little or no environmental impact. However, due to the lack of studies and repeated application in certain cultures it is important to check whether there are adverse effects on non-target soil organisms. Thus, the aim of this study was to evaluate the effect of Neem oil and Bordeaux mixture on survival and reproduction Enchytraeus crypticus and Folsomia candida. The tests followed the relevant
more » ... the relevant standards, where the pesticides are applied separately in tropical artificial soil, the tested doses 0, 0.3, 0.5, 1, 3 and 5%, corresponding to concentrations of 0.41, 0.69, 1.38, 4.15 and 6.91 mg g -1 soil. Effects on the organisms survival were only observed at doses equal to or higher than 3%. However, doses equal to or less than recommended (1%) had negative effects on reproduction. These results have a potential impact of Neem oil and Bordeaux mixture on non-target soil organisms, which must be proven with field studies. Figure 2. Exponential regression and effective concentration values (EC 50 ) for juveniles of E. crypticus and F. candida submitted to increasing doses of Neem oil and Bordeaux mixture. Values of the confidence interval of the estimates (CL95%): Neem oil in E. crypticus (0.25-0.70) and F. candida (0.88 -4.06); Bordeaux mixture in E. crypticus (0.36 -1.21) and F. candida (0.32 -5.58). Juveniles Juveniles Juveniles Juveniles Concentration of Neem oil (mg g -1 ) Concentration of Neem oil (mg g -1 ) Concentration of Bordeaux mixture (mg g -1 ) Concentration of Bordeaux mixture (mg g -1 ) EC 50 = 0.48 EC 50 = 2.47 EC 50 = 0.79 EC 50 = 2.95
doi:10.5039/agraria.v12i4a5480 fatcat:wbllfrakrvf6xcyukejsze3iai