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Controlling Slugs Cultural, Mechanical, Biological & Chemical Methods

Controlling Slugs Cultural, Mechanical, Biological & Chemical Methods. Slug on a fence . Photo: www.tammyslug.com. Written and designed by Julie Weisenhorn, Teaching Specialist, Department of Horticultural Science, University of Minnesota. May 1, 2001. Taxonomy Phylum: Mollusca

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Controlling Slugs Cultural, Mechanical, Biological & Chemical Methods

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  1. Controlling Slugs Cultural, Mechanical, Biological & Chemical Methods Slug on a fence . Photo: www.tammyslug.com Written and designed by Julie Weisenhorn, Teaching Specialist, Department of Horticultural Science, University of Minnesota. May 1, 2001

  2. Taxonomy Phylum: Mollusca Class: Gastropoda 3 Familes: Arionidae, Limacidae, & Milacidae Common in Midwest: Deroceras reticulatum Habitat: cool, moist & dark areas Black Slug (Photo: B. Symondson) Physiology Soft, unsegmented body Protective mucus Two pair of tentacles Chewing; radula Muscular foot; slime trail Grey Slug (Drawing: B. Symondson)

  3. Reproduction Hermaphrodites Average 20-30 eggs laid several times per year Eggs can be viable several years Photo: J. Hahn Damage Living & dead plant material – esp. leafy, bulbs, seedlings Damage: Irregular holes, slime trails, stripped stems, ragged foliage Photo: J. Hahn

  4. Cultural Control Slug on fence. Photo: Tammyslug.com • Change environment • First step; most effective • Good watering techniques • Reduce hiding places • Sanitation & plant care • Plant selection • Create environment to attract natural predators Dicentra spectablis. Photo: H. Wilson Carabid beetle. Photo: D.N. Ferro

  5. Mechanical Control • Traps & Bait • Desiccating, caustic, & rough surface barriers: Egg shells, wood ash wood chips, diatomaceous earth • Physical barriers: Copper, plastic, screening • Hand-picking • Animals Slug-X Slug Trap Photo: Gardener’s Supply

  6. Biological Control Parasitic nematode, Phasmarhabditis hermphrodita Left: healthy slug. Right: infected slug. Photo: R. Harvey • Isolated in Europe,1994 • Safe for humans, mammals & other invertebrates • Infects slug with Moraxella osloensis bacterium • Not found YET in North America • As effective as chemicals Parasitic nematode Photo: B. Wright, Univ. of Nebraska

  7. Decollate snail. Photo: www. Bionet.com Biological Control • Rumina decollata, predatory decollate snails • Sciomyzids, marsh flies • Carabid beetles: ground & rove beetles • Wildlife: frogs, fox, birds, moles • Trombidiid mites Carabid beetle. Photo: D.N. Ferro

  8. Chemical Controls • Metaldehyde • Methiocarb • Sulfur-based products • Salt • Cupric hydroxide • Ammonia + water solution • Herbal-based teas Photo: Eartheasy www.eartheasy.com

  9. Controlling Slugs Cultural, Mechanical, Biological & Chemical Methods Slug on a fence . Photo: www.tammyslug.com Written and designed by Julie Weisenhorn, Teaching Specialist, Department of Horticultural Science, University of Minnesota. May 1, 2001

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