[Effect of lethal doses of plants of the Agavaceae family on the cardiac activity and oviposition of Biophalaria havanensis (Mollusca: Planobidae)].

Work was carried out with lethal doses of 3 agavaceas, Agave legrelliana, Agave fourcroydes and Agave franzosinii, and it was determined the influences of LD50 and LD90 of agavaceas on the cardiac activity reduction. As a result, it was found that A. fourcryodes has the aqueous extract influencing the most on the reduction of heart rate. LD90 of agavaceas also affects the embrionary development of eggs having between 1 and 7 days of oviposition. The greatest affectation was found among the first. A. fourcroydes and A. legrelliana, respectively, influence the most on the reduction of the amount of eggs. The number of eggs ovipositted by mollucs surviving the application of LD90 from A. franzosinii is lower, as well as the number of hatched eggs.