Slug facts.

Grey Field Slug

Grey Field Slug (Deroceras reticulatum)

Black Keeled Slug

Black Keeled Slug (Milax gagates)

The two most serious problem slugs are the Grey Field slug (Deroceras reticulatum), and the Black Keeled slug (Milax gagates) Grey Field slug (Deroceras reticulatum) Black Keeled slug (Milax gagates).

Slugs vary in length from less than 10mm to more than 50mm.

Slugs in an upturned flower pot

Upturned flowerpot can be used to detect slug threat

Unlike snails, that live on the soil surface and aestivate in the crop canopy, or on shelter points such as rocks or posts, slugs live under the soil surface and can be difficult to detect. Slug burrows can be seen and eggs can be found on the backs of dead leaves or on other surfaces. Slugs do not have a summer aestivation, hence they can be active at any time if soil is moist.

Detecting slugs is achieved by using a moist harborage on the soil surface. Slugs will be drawn into this from below the soil surface and can be detected when the harborage is overturned. A simple plastic tray or moistened upturned earthenware flower pot or tray is all that is needed.

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