Efficiency of certain plant extracts on Aphis craccivora Koch. and its predator Chrysoperla carnea, steph., in Southern Valley of Egypt
2012
Haddad, H.A.
Four different plants species; Hyoscyamus muticus, Citrullus colocynthis,Schrad, Crozophora tinctoria and Ambrosia maritime were chosen in order to investigate the toxticty of their leaf, stem, flower, fruit or root extracts (using ethanol, acetone, chloroform and hexane) to nymphs and adults of Aphis craccivora and its predator Chrysoperla carnea. The plant extracts were treated using direct spraying, thin layer .film and feeding on infested insects. The results showed that, high concentration of H muticus hexane stem extract and ethanol leaf extract using thin layer film and H muticus ethanol leaf extract using direct spraying gave a high mortality rates after 24 and 48 h. For the C. colocynthis, stem extracts, high concentration in ethanol and hexane resulted also in high mortality rates of the pest after 24 and 48 h. For the C. tinctoria (leaves and flowers mixed), extracted by acetone using direct spraying gave a high, mortality rates after 24 and 48 h. A. maritime flower and leaf extracts in chloroform and acetone, respectively, using direct spraying gave low mortality rates after 24 and 48 h. Moreover, these high plant extract concentrations had no detrimental effect to Ch. carnea, can be considered as safety adjuvants of prospect of integrated pest control.
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