In traditional agriculture, plant extracts were the most effective source to protect the food, but by the nineteenth century this practice was gradually replaced by synthetic products. However, those products are expensive and induce the insect resistance, so researches are oriented to study the insecticidal activity of plant extracts aimed to isolate active (s) compound(s). In this work we studied the insecticidal activity of essential oils of three Chrysanthemum species against Tribolium confusum. Three methods are used, such as ingestion, topical application against adults and nymphs and fumigation against adults. The results analysis showed that ingestion of artificial medium treated by essential oils causes a decrease in larvae consumption and we noticed that C. macrotum essential oil was the most antifeedant one. In addition this oil caused significant mortality (68 %) in treated larvae. Topical application of essential oils against adults and nymphs beetle showed that C. macrotum essential oil is more toxic against adults (44%) than nymphs (28%). The analysis of fumigation results showed that the highest toxicity (48%) was caused by C. macrotum essential oil and that so it doesn’t exceed 1% in the case of C. trifurcatum and C. fuscatum. These results highlight that C. macrotum essential oil was most effective against T. confusum. Chemical analysis of different essential oils showed that C. macrotum essential oil was very rich in terpenes, where sesquiterpenes are the most abundant compounds. According these results we have determine the species and the chemical composition of the most toxic essential oil on T. confusum. Further study will be very useful to determine the toxic compound (s).
Comparison of chemical composition and bio-insecticidal activity of three Chrysanthemum species essential oils on Tribolium confusum Du Val (Coleoptera: Tenebrionidae)
FLAMINI, GUIDO;
2014-01-01
Abstract
In traditional agriculture, plant extracts were the most effective source to protect the food, but by the nineteenth century this practice was gradually replaced by synthetic products. However, those products are expensive and induce the insect resistance, so researches are oriented to study the insecticidal activity of plant extracts aimed to isolate active (s) compound(s). In this work we studied the insecticidal activity of essential oils of three Chrysanthemum species against Tribolium confusum. Three methods are used, such as ingestion, topical application against adults and nymphs and fumigation against adults. The results analysis showed that ingestion of artificial medium treated by essential oils causes a decrease in larvae consumption and we noticed that C. macrotum essential oil was the most antifeedant one. In addition this oil caused significant mortality (68 %) in treated larvae. Topical application of essential oils against adults and nymphs beetle showed that C. macrotum essential oil is more toxic against adults (44%) than nymphs (28%). The analysis of fumigation results showed that the highest toxicity (48%) was caused by C. macrotum essential oil and that so it doesn’t exceed 1% in the case of C. trifurcatum and C. fuscatum. These results highlight that C. macrotum essential oil was most effective against T. confusum. Chemical analysis of different essential oils showed that C. macrotum essential oil was very rich in terpenes, where sesquiterpenes are the most abundant compounds. According these results we have determine the species and the chemical composition of the most toxic essential oil on T. confusum. Further study will be very useful to determine the toxic compound (s).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
