? What is a large red slug

The large red slug (Arion rufus) has no shell, measures 8–20 cm and ranges in color from orange-red to dark brown. It secretes thick mucus that makes it difficult to handle. It is active at night and in cool, damp weather. It is a notable agricultural pest in greenhouses and nurseries.

Large red slug life cycle

The life cycle varies: woodlice reproduce through eggs in a brood pouch, while mollusks lay eggs in damp soil.

Where large red slugs occur

They occur worldwide in damp environments and are found in humid and agricultural areas of the Gulf, Saudi Arabia and Egypt.

Damage and risks associated with large red slugs

They feed at night on shoots, roots and leafy crops. In severe infestations, they destroy entire batches of farm seedlings. They do not directly transmit human diseases.

Signs of large red slugs

Signs include the animals themselves in damp, dark places, plant damage and slimy secretions (from mollusks).

Where large red slugs are found

They occur under tiles and damp wood, along the edges of garden beds, and under mulch and organic waste in greenhouses.

Large red slug control methods

Reducing humidity is the most important step. Remove firewood and accumulated organic matter. Use metaldehyde baits for slugs and diatomaceous earth for prevention.

Large red slug control products

Use metaldehyde for snails and slugs, environmentally safe iron phosphate, and diatomaceous earth for isolation.

Food-facility control requirements

FSSC/BRCGS: woodlice and mollusks indicate unacceptable moisture conditions and must be included in pest-control plans.

A fact about large red slugs

The slug’s mucus contains adhesive proteins that biotechnology researchers study as a model for adhesives used in wet environments. These proteins retain their adhesive properties in water, unlike all synthetic materials.

Frequently asked questions

Q: Are large red slugs dangerous?

A: Their risk level is moderate. Their presence in a facility indicates a moisture problem. Addressing the moisture source is more important than treating them directly.

Q: What does a moisture indicator mean?

A: The presence of these organisms indicates high humidity or a drainage problem in the facility. Addressing the moisture will reduce their presence automatically.