Actividad fungicida e insecticida de emulsiones agua/aceite de mezclas de extractos de nicotiana tabacum, Azadiractha indica y Eucalyptus tereticornis

Abstract

A study on the acute and chronic insecticide potential on Drosophila melanogaster and antifungal on Fusarium oxysporum of oil-in-water emulsions of binary and ternary mixtures of extracts of Nicotiana tabacum and Azadiractha indica (neem) and Eucalyptus tereticornis essential oil. Dose/response curves for the mean lethal time, pupae-egg ratio, adult-pupae and inhibitory rate for antifungal activity were constructed, compared with the bioactivity mixtures, measuring synergism, antagonism and joint activity. High insecticidal acute activity was observed in tobacco to 6 g/L (mean lethal time=2.3 ± 0.5 minutes), the neem larvicide to 0.2 g/L (pupae-egg ratio=0.05) and fungicide in the eucalyptus to 3 g/L (inhibitory rate=100%). The bioactivities were enhanced in almost all binary and ternary mixtures, except for the fungicidal activity. The ternary mixture exhibits fungicidal activity antagonistic. The study shows the potential application of these technologies to control pests and diseases.