Molluscicidal effects of acetone and ethanol extracts of clove (Syzygium aromaticum)‎ against Monacha cartusiana (Gastropoda : Hygromiidae)‎ snails under laboratory and field conditions at Sharkia governorate

Abstract EN

The present study aimed to investigate the effects of ethanol and acetone extracts of clove (Syzygium aromaticum) flower bud against the adult snails of Monacha cartusiana (Müller) (Gastropoda: Hygromiidae), at concentrations of 1, 2, 4 and 6% w/v, through using spray, contact and bait techniques under laboratory conditions, and at concentration of 6% under field conditions through bait technique only.

The results showed that the mortality percentage of M.

cartusiana was increased with increasing concentration of both crude extracts and time elapsed under the used methods.

The mortality and the assessment of the lethal concentrations for 50% (LC50) were determined at 3, 5 and 7 days of treatment.

The bioassay of S.

aromaticum against the land snail M.

cartusiana, indicated that ethanol extract had a more potent effect than acetone extract as regard spray and bait methods all over the experiment, however, it had a less potent effect during 5th and 7th days with contact method.

The lowest lethal concentration LC50 values of ethanol extract were 0.94, 1.14 and 3.47% for spray, contact and bait techniques for 7 days exposure period and for acetone extract were 1.06 and 0.52% at 5th and 7th days exposure period, respectively.

Field application by using a higher concentration (6%) as toxic baits, 60.28 and 49.28 % of reduction of M.

cartusiana snails were recorded for both clove ethanol and acetone extract, respectively within 21 days.

Snails display hyperactivity, a massive of air bubbles around the shell a perature, the body water lost as a result of excessive production of mucous secretion, complete withdrawal into their shell and died by the end of the experiment.