Abstract

RANGEL-RUIZ, Luis José et al. Molluscicidal activity of Laguncularia racemosa (L) C.F. Gaerth on Galba cubensis (Pfeiffer, 1839). Ecosistemas y recur. agropecuarios [online]. 2017, vol.4, n.11, pp.309-316. ISSN 2007-901X.  https://doi.org/10.19136/era.a4n11.978.

The molluscicidal effciency of Laguncularia racemosa on Galba cubensis was assessed using two aqueous extracts and direct application of powder (DAP). The aqueous extracts were prepared by the raw method extract (RME) and infusion method extract (IME) procedures. A randomized design with three treatments, one control and five replicates was used. For determining LD50 and LD90, the Probit-Log program was used. LT50 and LT90 were obtained; the RME concentrations were 500, 400, 333 and 289 g L-1; for IME, 50, 25, 12.5 and 6 g L-1; and for DAP, 0.540, 0.270 and 0.135 g. The efficacy of the treatments and the residuality of the IME at 50 g L-1 were determined. For RME, the cumulative mortalities were 100, 96, 90 and 66 % with a LD50 of 267.56 g L-1 and LD90 of 392.68 g L-1. For IME, it was 100, 98, 92 and 20 %, with LD50 of 8.08 g L-1 and LD90 of 12.78 g L-1; for DAP, it was 50, 48 and 48 %; only the concentration of 0.540 g reached 50 %; the LD50 was 1.0 g. For RME, LT90 occurred at 18, 72 and 96 h for 500, 400, 333 g L-1; for IME, at 2 h for 50, 25 g L-1 and 14 h for 12.5 g L-1. Residuality showed a low persistence of toxicity on the substrate.

Keywords : Molluscicidal activity; Laguncularia racemosa; Galba cubensis.