Field experiments had been conducted to evaluate the efficiency of certain biocides compared with some molluscicides against M. contiana land snails infesting sugar beet crop in Dakahlia and Kafr El-Sheikh governorates during 2008-2009 season. Results can be concluded that Agrein, Diple 2X, Protecto and Vertimec were tested as poisonous baits with rates of 2, 4 and 6 %. Reduction percentages were [(26.91, 30.19 and 41.10 %) and (26.14, 28.03 and 31.09 %)], [(26.91, 29.62 and 37.67 %) and (23.16, 28.67 and 32.66 %)], [(35.98, 45.15 and 47.36 %) and (27.12, 36.11 and 39.7 %)] and [(76.95, 82.07 and 81.05) and (72.60, 78.51 and 80.37)] in the two districts 21 day after treatment, respectively. Biocides reduced M.contiana population density with low values after 3 days of treatment but thereafter the reduction increased gradually to reach its maximum after 21 days,  this reduction isn't satisfactory so, it wasn't reached fifty percent except Vertimec. The efficiency of Gastrotox, Molotov and Neomyl were  ( 78.14,79.68 and 68.17% ) and (80.22, 78.61 and 72.14 %) 3 days after application, respectively. while values were (96.78, 98.46 and 97.18 %) and (94.36, 96.14 and 92.75 %) 21 days after treatment for above mention molluscicides in two districts, respectively.