Insecticidal effect of the extracts of cladonia foliacea (huds.) willd and flavoparmelia caperata (l.) hale against adults of the grain weevil, sitophilus granarius (l.) (coleoptera: curculionidae) [electronic resource]

Includes references.

Four different concentrations of cxtracts, obtained from the two lichen species (Cladonia foliacea (Huds.) Willd. and Flavoparmelia caperata (L.) Hale), were tested against the grain weevil, Sitophilns granaries (L.) under laboratory conditions. Mortality rate of adults was determined at 24, 48, and 96 h. Obtained results showed that the extracts of C. foliacea and F. capcrata had insecticidal effects on the adults of S. granarins in comparison with control. The insecticidal effect was influenced by thc concentration of the extract and the exposure time. Higher concentrations and longer exposure time resulted to highest toxicity levels on S. granarins. Mortality rates after 96 h of treatment with highest concentration (20 mg.mr') of the extracts of F. caperata and C. foliacea were determined as 91 and 83%, respectively. Bioassay revealed that 96 h LC50 values were 0.107 and 0.354 mg.mr', respectively. The results suggest that lichen compounds could be uscful as alternatives of pesticides.

Summary in Arabic.

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