z. mojib haghghadam

The effect of new formulations of Neem, Neemarin® and metaldehyde on slug, A. agrestis was evaluated in laboratory and greenhouse conditions. In bioassay experiments, the leaves of the ornamental plant (Spathiphyllum wallisii Regel) were dipped in different concentrations of neem and Neemarin®, and then same-age immature slugs were released on the leaves and their mortality and feeding were determined up to 14 days. The LC50 values for Neem and Neemarin® were estimated 34.1 and 22.5 ml/lit, respectively, and relative toxicity of Neemarin® was 1.59 times of /more than Neem. The greenhouse experiments were conducted in RCD with 4 treatments, and the maximum effect of the treatments was obtained for metaldehyde with a mean of 95.75% after 15 days compared to the Neem and Neemarin® with 47.85% and 51.63% mean mortality, respectively. Also, the effect of Neem and Neemarin® on the nutrition was 1.72 g and 1.9 g, respectively, in comparison with control (9 g) and the percentage of egg hatching significantly decreased compared to the control. According to the results, Neem and Neemarin® compounds in the concentrations 34.1 and 22.5 per thousand, respectively, and up to ten times on leaves of S. wallisii had a negative effect on the nutrition of A. agrestis and reduced the damage in greenhouse conditions. This effect with increasing age and body size of the slug and subsequent increase in concentration was maintained. However, they were less lethal than methaldehyde.