Histopathological alterations in the foot and digestive gland of the land snail, Monacha sp. (Gastropoda: Helicidae)‎ treated with some plant oils and neomyl

Abstract EN

The aim of this study was to test if the essential plant oils: Clove oil, Syzygium aromaticum (S.

aromaticum); black cumin oil or black seed oil, Nigella sativa L (N.

sativa) and mustard oil, Brassica alba (B.

alba) have a molluscicidal potential that induced histological alternations against the land snail Monacha sp.

(Muller) (Gastropoda: Helicidae) comparing with neomyl as a slandered chemical molluscicide.

The tested oils were applied separately as a spray with sublethal concentration (60% of LC50 /24 hrs.) to the snails and their food.

The estimated value of LC50 was 0.

125%, 4.17%, 9.29 % and 15.29 % of neomyl, clove oil, black cumin oil and mustard oil respectively, and the values of (60% of LC50) were 0.075, 2.502, 5.574 and 9.174% respectively.

The effect was observed on the histological structure of the foot and hepatopancreas after four days of treatment.

Snails in both control group and the vehicle (1% tween 80) treated group exhibited nearly the same normal histological structures of the examined tissues, whereas those treated with sublethal concentrations of the tested compounds exhibited substantial damages almost proportional to the potency of the applied compounds.

Neomyl was the most effective one followed by clove oil, black cumin oil and mustard oil which is the least effective one.

Thus, it can be concluded that these tested oils obtained from plants are toxic to the snail Monacha sp.

and can introduce economic control of its population without causing environmental pollution.