تأثیر عصاره فرموله شده سیر روی راب Agriolimax agrestis درگلخانه کاهو

Agriolimax agrestis (Linne, 1758) is one of the most important pests of vegetables, summer and greenhouse crops all over the world, which sometimes cause irreparable damages to these crops. According the problems caused by using chemical molluscicides, the main priority in slug management is to find suitable alternatives for high-risk compounds. In the present study, the effectiveness of formualted garlic extracts (50% emulsion) on A. agrestis in lettuce (Lactuca sativa) greenhouses of Mazandaran (Sari) and Alborz (Karaj) provinces were evaluated in the form of a completely randomized statistical design. Bioassay test was performed on immature slugs of the same age weighing 0.5 to 0.7 grams and their mortality percentage were determined after 24 hours and the LC50 value was estimated. Efficiency evaluation experiments were done in the greenhouse with treatments 1- garlic extract (in two concentrations of 1 and 2 times LC50), 2- mineral molluscicide, Ferricol® (5 g/m2), 4- Chemical molluscicides, Lumakidin 5G® (0.7 g/m2) and 5- control. Based on the results of bioassay tests, the LC50 value for garlic extract was estimated as 24.6 g/L. In the greenhouse, with the increase in the concentration of the extracts, the effectiveness percentage increased. The average efficacy of garlic extract treatment with twice the LC50 concentration in two provinces after two, four, eight, fifteen and twenty-one days were calculated 55.83±2.51, 60.83±2.94, 64.98±2.31, 70.27 ± 2.33 and 73.70 ± 2.42 percent respectively. Although this efficiency was significantly lower on the 21st day compared to metaldehyde, but the results show that garlic extract is able to cause losses in the population of immature slug A. agrestis. Besides, in the mentioned concentration, with a significant reduction feeding amount, on the 21st day of the experiment (in Mazandaran and Alborz provinces, 37.7% and 32.8%, respectively) Compared with metaldehyde treatment (26.5% and 30.9%, respectively) had not statistically significant difference. Therefore, in order to reduce the consumption and adverse effects of chemical poisons, alternating use of garlic extract with other slug killers can be considered in A. agrestis management programs.