Evaluation of Certain Chemical Fungicides for Controlling the White Garden Snail, Theba pisana (Muller)

Abstract

The present research was carried out during the season of 2014 for controlling the white garden snail, Theba pisana (Muller) under laboratory conditions by using some chemical fungicides (Copper sulfate 50%, Copper hydroxide 53.8% and Benalaxyl) with three concentrations (0.5, 0.25 and 0.125%) for each insecticides as spraying lettuce leaves and baits. The results showed that, in all concentrations, the mortality rates increased by the time and most mortality achieved over seven days post fungicides treatments, for the white garden snail, Theba pisana (Muller) by concentrations of 0.5%, 0.25% and 0.125%, in respectively for both treated spraying lettuce leaves and baits. Spraying lettuce leaves of copper sulfate 50 % were achieved mortality percentages 64, 57 and 38 for concentrations (0.5, 0.25 and 0.125%), respectively while baits were achieved mortality percentages 52, 48 and 24 for the same concentrations after 7 days, in this respect. The corresponding LT50 (day) values were 5.21, 6.08 and 9.27 for spraying lettuce leaves and 7.03, 6.96 and 9.70 for baits at tested concentrations of 0.5%, 0.25% and 0.125%. Copper hydroxide 53.8% achieved mortality percentages 48. 32 and 17 for the same concentrations in spraying lettuce leaves but in baits achieved 28, 21 and 13 for the same concentrations after 7 days, respectively, corresponding to LT50 (day) values were 8.46, 8.59 and 10.27 for spraying lettuce leaves and 10.27, 9.31 and 11.32 for baits at its tested concentrations of 0.5%, 0.25% and 0.125%, in respect. Also. benalaxyl achieved mortality percentages 62, 34 and 16 for the same concentrations in spraying lettuce leaves but in baits the mortalities achieved 54, 30 and 11 for the same concentrations after 7 days, in respect, corresponding to LT50 (day) values of 6.24, 9.56 and 22.20 for spraying lettuce leaves while for baits the values were 7.04, 8.56 and 15.21 at its tested concentrations.