SUMMARY The fight against adults of Aedes albopictus is temporary, unsatisfied, and polluting for the environment, while larval treatment is more localized in time and space, resulting less dange- rous. The most common antilarval product used is a crystal protoxin of Bacillus thuringiensis var. israelensis serum-type 14 produced during the sporulation process and considered harm- less for humans, ... [Show full abstract] fishes, and other not dipteran insects. Unfortunately the antilarval activity of B. thuringiensis is lost after 24 hours, when larvae can develop undisturbed and its activity is completely absent against eggs and pupae. Acqueous extract of roots of Codonopsis javanica Hook. f. & Thoms (Campanulaceae) was tested to develop new natural formulations against larval and pupal stages of A. albopictus showing poor or no activity against larvae; on the contrary, statistically significant activity was observed against pupae after 48 hrs with 75% of mortality both at 12.79% and 6.39% concen- tration of the decoction.