Laboratory evaluation of the root exudates of the Clerodendron inerme in controlling on Aphis craccivora Koch

Abstract

This study was conducted to check for the biological efficacy of root exudates of Clerodendron inerme on some biological aspects of Aphis craccivora. Also, the study included the detection of the compounds in root exudates of C. inerme by using the gas chromatography-mass spectrometry technique. Results showed that the high concentration of root exudates recorded high cumulative mortality of the adult insects after exposure time 1, 2, and 3 days from treatments 28.5, 33.8, and 40.3% respectively compared with 32.4, 39.3, and 48.5% respectively of nymphs insects. The developmental period of the immature stages has increased from 6.5days in the control treatment compared with 9.3days at high concentration while the fecundity of adult females reduced to reach 18.00nymph at high concentration compared with 26.66nymphs in the control treatment. GC-MS analysis of root exudates of C. inerme showed the presence of many compounds such as2-Propenoic acid, ethenyl ester, 2-Phenanthrenol.