Abstract
The reproductive system of snails represents essential organ that affects snail population size. Therefore, the present research was directed to evaluate the effect of two biopesticides chitosan (Ch) and emamectin benzoate (EMB) LC50 on the reproductive system of Eobania vermiculata (Muller). Land snails were treated using thin-film layer technique. Snails were dissected and organs of reproductive system were weighted and examined for any pathological changes at 24, 48 and 72 h post treatment. Moreover, steroidal hormones were determined after 72 h of treatment with either chitosan or emamectin benzoate in comparison to untreated snails. Results revealed that the penis and dart sac increased in size, while ovotestis was decreased at the 3 different periods than the same organs of untreated snails. In addition, there was swelling in the size of some organs, i.e penis and vagina. While there was stunting in the albumen gland at 72 h of treatment with Ch or EMB. However, histological examination showed damage of the ovotestis and atrophy of induced cells in the dart sac and penis. The incidents of both compounds on the level of steroidal hormones gave fluctuating results, either increasingly or decreasingly. In conclusion, data emphasize that both tested compounds caused reduction in the numerical density of the E. vermiculata reproductive system and consequently decreased their fertility, as well as reduction in its population.
Highlights
Terrestrial gastropods form the most important threats of sustainable agriculture in many parts of the world (Barker, 2002)
Effects of tested biopesticides on Eobania vermiculata using the residual film technique The molluscicidal activity of Emamectin benzoate (EMB) and Ch against E. vermiculata was determined under laboratory conditions
The results showed that Ch exhibited 2-fold molluscicidal potency than EMB
Summary
Terrestrial gastropods form the most important threats of sustainable agriculture in many parts of the world (Barker, 2002). They play an important role in transmitting and spreading diseases to cultivated plants (Godan, 1983). Eobania vermiculata (Muller), is the most widespread snail species in the agricultural field and orchards in Egypt (El-Sayed, 2013). Kandil et al Egyptian Journal of Biological Pest Control (2020) 30:21 compounds are nontraditional control agents and could be used to combat land snails. The main objective of this study was to evaluate the effect of both compounds (Ch and EMB) on the sexual hormonal disruption in E. vermiculata as well as examine their anatomical, histopathological impact on the reproductive system (hermaphrodite) and egg production
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