What traditional method is recommended for monitoring Slugs in a field?

Using shelter traps is a traditional method recommended for monitoring slugs in a field for several reasons. Shelter traps work by providing a protected environment that attracts slugs in search of moisture and shelter. These traps typically consist of flat surfaces, such as boards or tiles, placed on the soil. Slugs, which are nocturnal creatures, tend to hide underneath these materials during the day. When checking the traps, you can directly observe the presence and quantity of slugs, giving you valuable data on their population levels and activity within the field.

This method is effective because it mimics the slugs' natural behavior, allowing for simple and straightforward monitoring. The other methods, while useful in monitoring different pests or aspects of the environment, do not specifically cater to the habits and biology of slugs, making shelter traps the most appropriate choice for directly assessing slug populations.