Study of control methods and economic injury level of slugs pest on lettuce in Mazandaran province

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Two slug species (Parmacella ibera and Agriolimax agresteris) from Parmacelidae and ‎Limacidae families were found dominant injuries slugs in nursery and field conditions during ‎2001-2003. Different methods of control under field condition in Grakheil station of Sari vicinity ‎studied. The experiment conducted in complete randomized block design with eight treatments and ‎four replications. Each replicate consist of the three meters in length and 50 cm in width and lettuce ‎plant to plant spacing of 25 cm. In total 36 lettuce plants cultivated in each replicate. Means were ‎compared using Duncan’s Multiple Range Test (P? 0.05). The results indicated that maximum ‎damages according leave injuries and minimum lettuce yield obtained for ploughing treatment, ‎which 27.3 percent damages with lettuce yield 29.1 ton per hectare. Min. damages with Max. Yield ‎found with Metaldehyde, Methiocarb and Iron phosphate treatments, with two percent and nine ‎percent damages and lettuce yield 39.3, 39.1 and 36.2 ton per hectare, respectively. Metaldehyde ‎and Methiocarb were the best treatments for control of slugs. Among the various control methods, ‎the percentage of loses at the beginning of the injury was lowest for Methaldehyde (4.3 percent) and ‎highest for the thick rough rope (15.5 percent).‎

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