Use of some plant extracts to control Biomphalaria alexandrina snails with emphasis on some biological effects

Bakry, Fayez A.

doi:10.1016/j.pestbp.2009.08.007

Cited by 38 publications

(28 citation statements)

References 18 publications

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“…Our data on the infection of B. alexandrina with S. mansoni show that although the prepatent period of the parasite within the snail tissues following incubation with Cu-chl and Mg-chl three and 21 days after exposure to S. mansoni miracidia was not significantly different from that of the light control group, the duration of cercarial shedding and cercarial production per infected snail were significantly reduced. Similar results were obtained by Gawish (2008), bakRy (2009), MahMoud et al (2011) and rizK et al (2012 who found that exposure of B. alexandrina to the plants Syzygium jambos, Euphorbia splendens, Atriplex stylosa, Datura stramonium, S. sesban and H. tuberculatum had an obvious negative effect on the duration of shedding of cercariae of S. mansoni and on the total cercarial production per infected snail. The authors conjectured that the reason could be disturbances in the activities of the snail enzyme system and the total protein concentration in the tissues and haemolymph which suppressed the development of parasite larval stages in the snail tissues.…”

Section: Discussionsupporting

confidence: 86%

Fecundity, sex hormones and release of cercariae of Schistosoma mansoni in Biomphalaria alexandrina (Ehrenberg, 1831) treated with copper and magnesium chlorophyllin

Ragheb¹,

El-Tayeb²,

El-Emam³

et al. 2018

Folia Malacol.

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Schistosomiasis is a public health problem in many developing countries. Control of the snail intermediate hosts of Schistosoma is a promising method for eliminating this disease. Copper (Cu-chl) and magnesium chlorophyllin (Mg-chl) are potent photosensitisers used in diverse biological applications. Their effects on the fecundity of Biomphalaria alexandrina (Ehrenberg): its reproductive rate (R 0 ) and total levels of progesterone, testosterone and estradiol were evaluated. Besides, we determined the production of cercariae of S. mansoni. The concentrations LC 10 and LC 25 of Cu-chl and Mg-chl significantly reduced the fecundity and R 0 of the treated snails which could be partially due to the decrease in the level of steroid sex hormones. The reduction rates of R 0 for the snails treated with LC 10 Cu-chl and Mg-chl were 72.7% and 89.7%, respectively. Moreover, Cu-chl and Mg-chl significantly suppressed the cercarial production which dropped from 9,778 cercariae per snail in the light control group to 3,126 and 107 cercariae per snail in the groups treated with LC 10 Cu-chl and Mg-chl 21 days after exposure to miracidia, respectively. Since Cu-chl and Mg-chl negatively interfere with the parasite transmission, they should be considered in schistosomiasis control programmes.

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Section: Discussionsupporting

confidence: 86%

Fecundity, sex hormones and release of cercariae of Schistosoma mansoni in Biomphalaria alexandrina (Ehrenberg, 1831) treated with copper and magnesium chlorophyllin

Ragheb¹,

El-Tayeb²,

El-Emam³

et al. 2018

Folia Malacol.

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“…Studies on the molluscicidal activity of natural products have been stimulated due to the high cost of synthetic molluscicides and recurrent resistance of snails to these (Bakry 2009;Bezerra et al 2002;Luna et al 2005;Mello-Silva et al 2007;Rapado et al 2011;Silva et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Molluscicidal activity of some marine substances against the snail Biomphalaria glabrata (Mollusca, Planorbidae)

et al. 2011

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Freshwater snails of the genus Biomphalaria play a major role as intermediate hosts of Schistosoma mansoni, the etiologic agent of schistosomiasis. While Biomphalaria spp. control by molluscicides is one of the main strategies to reduce the snail population in infected areas, there are few effective molluscicides commercially available. Natural products may be considered as potentially useful and safe molluscicides. We have evaluated the molluscicidal activity of 12 extracts from ten marine organisms on adult and embryonic stages of Biomphalaria glabrata. Only extracts of the red algae Liagora farinosa and of the sponge Amphimedon viridis presented molluscicidal activity. Lethal concentration (LC)(50) values obtained were 120 μg/mL for L. farinosa CH(2)Cl(2) extract (apolar fraction) and 20 μg/mL for A. viridis extract and halitoxin. The polar alga fraction and halitoxin had no effect on B. glabrata embryos. The algae apolar fraction was active on B. glabrata in all embryonic development stages, with LC(50) values for blastulae at 42 μg/mL, gastrulae at 124 μg/mL, trochophore at 180 μg/mL, and veliger at 222 μg/mL. This is the first report of extracts from marine organisms which presented molluscicidal activity.

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“…The authors stated that alga secrets substance (acrylic acid), which causes high mortality, low fecundity and low hatchability of affected snails. This explanation was also adopted by Bakry, (2009), who indicated that S. platensis secrets organic substances or metabolic products such as phycobiline, phenols, terponoids, steroids, polysaccharides and saponins.…”

Section: Discussionmentioning

confidence: 94%

Molluscicidal effect of some red and green marine algae on Lymnaea natalensis

Saad¹,

Hassanain²,

Darwish³

et al. 2019

Egypt. J. of Aquatic Biolo. and Fish.

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Molluscicide Fasciola gigantica bioactive metabolites Ulva lactuca Jania rubens Marine algae are economically important aquatic photosynthetic organisms act as a source of highly bioactive metabolites that might be useful against predators and parasites. In the present study, aqueous and ethanol extracts of four algal species of marine algae; Pterocladia capillacaea (P. capillacaea), Jania rubens (J. rubens), Ulva lactuca (U. lactuca), and Enteromorpha intestinalis (E. intestinalis) were tested for their lethal effect on Lymnaea natalensis (L. natalensis) snail, the intermediate host of the trematode parasite; Fasciola gigantica, (F. gigantica). Preliminary experiments were done to determine the molluscicidal toxicity of different concentrations of aqueous and ethanol algal extracts against the studied snail. Five concentrations of aqueous and ethanol extracts; 100, 200, 300, 400 and 500 ppm for each algal species were used. LC 50 for each extract was calculated daily till the end of the experiment. It is clear from the results that molluscicidal effect of algal extracts is concentration dependent. The most potent extracts as proved by calculated LC 50 are P. capillacaea and J. rubens aqueous extract (red algae); 111.3 and 127 ppm respectively and U. lactuca ethanolic extract (green algae) 121 ppm. The current study introduces marine algae of promising molluscicidal activity on L. natalensis snail. P. capillacaea and J. rubens aqueous extracts and U. lactuca ethanolic extract are the most potent and highly significant ones in the net reproductive rate and reduction. Further investigations for isolation of active principals of the algal potent extracts for evaluation as molluscicides and or anthelmintics are necessary required.

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Use of some plant extracts to control Biomphalaria alexandrina snails with emphasis on some biological effects

Cited by 38 publications

References 18 publications

Fecundity, sex hormones and release of cercariae of Schistosoma mansoni in Biomphalaria alexandrina (Ehrenberg, 1831) treated with copper and magnesium chlorophyllin

Fecundity, sex hormones and release of cercariae of Schistosoma mansoni in Biomphalaria alexandrina (Ehrenberg, 1831) treated with copper and magnesium chlorophyllin

Molluscicidal activity of some marine substances against the snail Biomphalaria glabrata (Mollusca, Planorbidae)

Molluscicidal effect of some red and green marine algae on Lymnaea natalensis

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