Slugs and snails

What are they?

Slugs and snails are molluscs, like oysters and clams. They are both similar in structure, except that the snail is protected by a hard shell that makes it less vulnerable than slugs to dry conditions and the sun.

Slugs and snails have a soft, unsegmented body that is 2 to 4 cm (.79 to 1.5 inches) long. The head has one or two pairs of tentacles. The front tentacles are sensitive to odours and sometimes taste, while each of the larger back tentacles have an eye at the end.

Slugs and snails are known as gastropods, which means "stomach foot." The foot located on the stomach is how they move around. Slugs and snails are also hermaphrodites, with both male and female organs. Snails have an external shell large enough to cover the entire animal, helping them to survive severe drought and heat.

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Should I be concerned?

When slugs and snails invade vegetable or herb gardens, they can cause major damage, eating up to 40 percent of their weight in a day. Slugs and snails attack seedlings, roots, tubers, and young plants, leaving large jagged holes and sticky silvery deposits, mainly on the leaves of herbs and garden vegetables.

Did you know?

In spring, soft sounds can be heard from slugs and snails under shrubs whose leaves are coming out. The animals crawl out of their winter shelter in search of damp surroundings where they can live. Moisture and mulch encourage slugs and snails to multiply.

How do I know if I have a problem?

During the day, slugs and snails hide in cool, dark places: under dead leaves, lumps of earth, rocks, mulch, and wooden boards. When dusk falls, they come out from their shelters in search of food. They are also more active under cloudy conditions or after a light rain. Their active period is from about April to October, and then they hibernate until the next spring.

How can I get rid of slugs and snails?

To prevent slugs and snails from invading vegetable gardens, it is important to remove all decaying vegetables and other sources of food, as well as bricks, boards, and piles of debris that are directly in contact with the soil. It is also a good idea to rake fallen leaves and to thin plants so the sun can get through more easily.

Snail and slug removal

Did you know?

When snails are faced with difficult living conditions, they react by sealing the opening of their shells with a mucus sheet (known as an operculum), which soon hardens to a leathery texture. The snails can then become dormant, and can remain this way for up to four years.

Products

Important!

If you use a pesticide to control your pest problem, read the label to make sure you are choosing the right product for the right pest. Follow all label directions and warnings carefully. Always look for a Pest Control Products (PCP) number on the label so you know the product has been approved by Health Canada. See Use pesticides safely for more information on using pesticides safely

Important!

Chemicals should not be used on the leaves and edible parts of garden vegetables. Make sure that children and pets can't get at the bait, which can cause poisoning.

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