The Toxicological Effects of Nerium oleander and Yucca glauca as Crude Leaf Extracts by Different Methods against Cowpea Aphid, Aphis craccivora (Koch) and Their Chemical Components

Document Type : Original Article


Plant Protection Research Institute, ARC, Doki, Giza, Egypt


The current study carried out during Spring  season of  2015 year under laboratory conditions, in at Plant Protection Research Institute , Doki, Giza, Egypt. The experiment aimed to study the toxic effects of Oleander,  Nerium oleander and Soapweed, Yucca glauca as a botanical leaf extracts against Aphis craccivora  nymphs , fecundity, physic-chemical properties and the identification of their chemical components. Botanical leavesextracted using  chloroform , ethanol and water as a solvents. The results showed that crude extracts produced from N. oleander were the superb toxic than Yucca glauca, also N. oleander with Chloroform was the most effective followed by ethanol and water against A. craccivora , whereas water produced the least toxic extracts. On the other hand, the results indicated that Y. glauca recorded lowest LC50s and LC90s with Chloroform compared with Y glauca with other solvents.   In case of , N. oleander extracts ( with chloroform, ethanol and water ) reduced fecundity (offspring number)  of A. craccivora  compared with Y glauca extracts, wherever  N. oleander with chloroform recorded the lowest fecundity at a 800 ppm concentration followed by other concentrations. In addition to there are differences in physico-chemical properties between two botanical extracts with different solvent ,  the obtained  result showed that  foam disappearance  in case of extracts with chloroform and ethanol but were 33 and 3 ml in case Y. glauca and N. oleander with water alone, surface tension were decreased when adding chloroform and ethanol recorded 18.74, 31.81 and 19.54, 31.81 with Y. glauca  with chloroform , ethanol and N. oleander with chloroform and ethanol, respectively, but adding water to Y. glauca  and N. oleander cause increasing surface tension recorded 59.48 and 65.14, respectively . Also, PH values ranged between high acidic and slightly acidic. On the other hand data showed that  number of component of Yucca glauca  and Nerium oleander extracts were contain 27 and 38  compounds, respectively.
Recommendation : The paper recommended using Nerium oleander and Yucca glauca extracts with chloroform in A. craccivora ( Koch ) control.