APHICIDAL AND REPELLENT ACTIVITIES OF PLANT EXTRACTS FROM Hertia cheirifolia L. AND Marrubium deserti de Noé

Abstract

The black bean aphid Aphis fabae constitutes a dangerous pest. The use of pesticides provokes undesirable effect on the environment and the human health. Thus, the research for methods with low negative secondary effect becomes very important. The purpose of this study is the screening of the aphicidal activity of extracts from Marrubium deserti and Hertia cheirifolia. Moreover, the effect of the same treatments was tested on the orientation of A. fabae.
Through our study, ANOVA revealed significant differences between the studied essential oils. Those of H. cheirifolia with a concentration of 10000 ppm were the most effective with 96.67% of corrected mortality rate after 6 hours. Whereas for aqueous extracts, the mortality rate were less important and it reached only 30% after 24 h for H. cheirifolia 30% extracted by maceration. For the test of orientation, the results showed that after 24 hours, the essential oils of H. cheirifolia with a concentration of 10000 ppm and the extracts obtained by maceration of the two plants had an important repellency rate superior than 70%.