ASSESSMENT OF MOLLUSCICIDAL ACTIVITY OF CERTAIN PESTICIDES AGAINST TWO LAND SNAILS UNDER LABORATORY AND FIELD CIRCUMSTANCES AT DAKAHLIA GOVERNORATE.

The activity of certain pesticides were evaluated against Monacha cartusiana
and Eobania vermiculata land snails under laboratory and field conditions at Oakahlia
Governorate using poisons bait technique.
Laboratory experiment revealed that Neomyl exhibited the highest toxic action
against M.cartusiana snails followed by Vertimec, Marshal, Dursban, while Curacron
was the least toxic one. Values of LC50's were 0.44, 0.54, 1.67, 3.69 and 4.67 %
respectively. In respect of E vermiculata snails LC50's values of the same tested
compounds were 0.64,0.65,2.94,4.73 and 10.14 % for Vertimec, Neomyl, Marshal,
Dursban and Curacron, respectively.
In field experiment Neomyl and Vertimec were tested against M.cartusiana on
Egyptian clover crop and E vermiculata infesting ornamental plants with 1, 2, 4 and 8
% concentrations.
The initial and residual activity of the two tested compounds were [(42 and
66.33 % ), (51 and 75.66 %), (55 and 83.33 %) and (62 and 89.66 % ) ] and [(24 and
45 %), (31 and 55.66 %), (35 and 64.66 %) and (40 and 72.66 %)] reduction after 3
and 21 days post-treatment for M.cartusiana snails respectively, while against
Evermiculata snails were [(31 and 54.66 %), (38 and 74.33 %), (52 and 82.33 %) and
(57 and 88 %)) and [(44 and 47 %), (49 and 58.66 %), (51 and 70.66 %) and (58 and
81 %)]reduction respectively.