Effect of Melia azadirchta Fruit extract on the eggs, embryo and Juveniles of the fresh water snail Physa acuta ( Draparnaud) , at different experimental tern per a tures.

(Gastrula, Trochophore& hatching) as the incubation temperatureincreased and it was very The influence of the alcoholic extract of Meliaazadirchta fruit of different concentrations at different experimentaltemperatures on the fecundity, embryonic development and hatching of Physa.acuta were investigated. There was significant difference between theembryonic development reared at relatively higher temperature ( 32C 2) andthose reared at low temperature( 10 C 2 ),their was small acceleration in therate of development at various developmental stagessignificant (3.90 days) forTrochophore stage at 30C when it was compared with that at 10&15C(13.6&15.6 days respectiv~ly.While the molluscicide showed reverse effect as the temperature increase,its effect decrease to certain extend. The botanic molluscicide toxicity againsteggs of P.acuta was more effective when newly laid eggs exposed to themolluscide , as well as the subsequent developmental stages affected ascomparing the duration time of hatching stage & the size of juvenile snails,with those exposed to the molluscicide at Gastrula & Trochophore stages.