EFFICACY OF CERTAIN CHEMICAL CONTROL AGENTS AGAINST LAND SNAILS WITH SPECIAL REFERENCES TO THEIR PHYSIOLOGICAL EFFECTS

Abstract

The terrestrial chocolate band snail Eobania vermiculata (Muller) family Helicidea is one of the most commonly disturbed land snails in Egypt. This snail cause great damage to all parts of different vegetations i.e orchard trees, vegetable, field crops as well as ornamental plants. Laboratory and field experiments were carried out to study the molluscicides of six pesticides,other three biocompounds and their mixture using leaf dipping or thin film layer technique against the land snail Eobania vermiculata. The tested pesticides were oxamyl,L- cyhalothrin,cadusafos, dinotefuran, Emamectin benzoate and chitosan while the three other bio compounds were thymol, spurg plant extract and mineral fertilizer 1. Toxicity studies a. Laboratory studies 1. Molluscicidal effect The toxic effect of the tested compounds was tested as dipping and thin layer film techniques against the land snail E. vermiculata. The concentrations prepared in dipping as contact method whereas 2ml of each concentration was used for each compound. Results revealed that, chitosan was the most toxic one against E. vermiculata and its LC50 was 142.77 ppm followed by oxamyl 151.2 ppm while plant extract was the lowest effective compound with 780.64 ppm using dipping technique.Concerning the contact application L- cyhalothrin was the superior compound recorded LC50 58.6 ppm.While, chitosan