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Larvicidal activities of sesquiterpenes from Inula helenium (Compositae) against Aedes albopictus (Diptera: Culicidae) and Paratanytarsus grimmii (Diptera: Chironomidae)

2008; Springer Science+Business Media; Volume: 43; Issue: 1 Linguagem: Inglês

10.1303/aez.2008.77

1347-605X

Tenji Konishi, Shigeo Kondô, Nahoko Uchiyama,

Essential Oils and Antimicrobial Activity

The larvicidal activities of three sesquiterpenes, alantolactone, isoalantolactone and dihydroisoalantolactone, isolated from the roots of Inula helenium (Compositae) against 3rd and 4th instars of Aedes albopictus (Diptera: Culicidae) and Paratanytarsus grimmii (Diptera: Chironomidae), were examined. The two sesquiterpenes, alantolactone and isoalantolactone, showed LC50 values of 2.7 μg/ml and 11.9 μg/ml for A. albopictus, and 5.1 μg/ml and 4.1 μg/ml for P. grimmii within 48 h, respectively. Alantolactone was significantly more toxic than isoalantolactone against A. albopictus; however, dihydroisoalantolactone did not entirely show lethal effects against the larvae of both species at a concentration of 1,000 μg/ml.