Laboratory and field evaluation of certain chemicals comparing with methomyl against land snail Monacha sp. (Stylommatophora : Hygromiidae)‎ infesting Egyptian clover plant

الملخص EN

The land snails feed on leaves, roots, tubers and seeds of of ornamental plants, , citrus, peach, plam , cabbage, carrot and bean as well as thses crops lose their marketability and hence their export potential in many countries.

Efficacy of some chemicals as Potassium hydroxide, Ferrous sulphate and Sulphonic acid compared with Methomyl as standard pesticide was evaluated against Monacha sp.

(Stylommatophora: Hygromiidae) under laboratory and field conditions infesting Egyptian clover plant.

The obtained results in the laboratory exhibit the following ; the all tested chemicals exerted substantial mortality against Monacha sp.

after one day of evaluation where the general mean of mortality percentage values was 63.3, 63.3, 25.8 and 21.6 for Methomyl, Potassium hydroxide , Ferrous sulphate and Sulphonic acid , respectively.

Methomyl treatment was more toxic than that appeared with other tested treatments after 3 days of treatments where values were 87.5, 72.5, 36.6 and 31.6 for Methomyl, Potassium hydroxide , Ferrous sulphate and Sulphonic acid , respectively ( values increased as concentration and time increased).

According to mortality percentages, the descending order of the tested chemicals was Methomyl, Potassium hydroxide , Ferrous sulphate and Sulphonic acid where the general mean was 87.5, 74.1, 45.8 and 41.6 , respectively after 21 days.

The field experiment appeared that, the spray of Methomyl (1%) gave the highest reduction percentages 93 and 83% after 7 and 15 days of treatments, respectively; while it was 73 and 49% with Potassium hydroxide and was 49 and 50 % with Ferrous sulphate and the least values were 43 and 42 % with Sulphonic acid .