Repellent and Insecticidal Effects of Some Plant Extracts on Flour Beetle Tribolium castaneum Herbst (Coleoptera:Tenebrionidae)

Document Type : Original Article

Authors

Fac. Agric., King A.Aziz UN, Dept., Environmental sciences, Saudi Arabia

Abstract

The repellency and insecticidal activity of ethanolic plant extracts from Rhazya stricta, Caralluma tuberculata , Capparis spinosa, Marrubium vulgare and Argemone ochroleuca were evaluated against red flour beetle, Tribolium castanium in the laboratory. The dosages used were 200, 400, 600 and 800 ppm. Larvae and adult beetle were exposed to the treated wheat flour for 6 days. Mortality percentage was recorded after 2, 4 and 6 days from exposure. The repellent action of the previous plant extracts was also, studied using the same dosages. All of these extracts showed remarkable toxicities in a dose dependant manner. Results showed that complete mortality of T. catanium was achieved by C. tuberculata at the concentration of 800 ppm for both larvae and adult beetle. Also, complete mortality was recorded with R. stricta extracts for adult of T. castanium only at the same concentration. On the other hand, extract of C. spinosa was more toxic to larvae (95%) than adult (90%) with the same concentration.  The rest of plant extracts mortality was increased with increasing of concentrations. Medium lethal concentrations (LC50) against larvae for C. tuberculata, R. stricta and C. spinosa were 162.79, 201.25 and 210.64 ppm after 2 days and chronic (6 day) were 112.41, 129.91 and 133.08 ppm. As for adult, it were 231.22 , 286.99 and 307.68 ppm LC50s values after 2 days. After 6 days it was 126.47, 137.14 and 142.54 ppm LC50s, respectively. Other plant extracts were less toxic to larvae and adult of red flour beetle. Moreover, R. sricta, C. tuberculata and C. spinosa exhibited high repellency 100%, 90.08% and 82.54 % at concentration of 800 ppm against T. castanium adult. The application of these plant extracts may be promising in protecting of stored products against the attack of T. castanium specially extracts of C. tuberculata, R. stricta. and C. spinosa

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