Ditylenchus destructor

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symptoms of Ditylenchus destructor infestation on carrots (click on image to enlarge it)
Author(s): Bonsak Hammeraas, Bioforsk - Norwegian Institute for Agricultural and Environmental Research
Source: IPM Images

Ditylenchus destructor Thorne, 1945 - (potato tuber nematode)

symptoms of Ditylenchus destructor infestation on potato tuber (click on image to enlarge it)
Author(s): Bonsak Hammeraas, Bioforsk - Norwegian Institute for Agricultural and Environmental Research
Source: IPM Images

The nematode has a world-wide distribution in areas with a temperate climate. It is endoparasitic and migratory, without a fixed location in the plant. It attacks tubers, bulbs and rhizomes of crops like potato, hop and ornamentals, particularly in wet soil. The infested tubers become brown and rot, with dark patches and cracks on the skin. There are few above ground symptoms, apart from stunting.

The nematode disperses short distances through the soil and spreads to other areas through the transport of infested tubers. Management involves the use of nematicides and crop rotation.

The eggs hatch as 2nd instar juveniles (J2) which develop through 2 additional juvenile stages before reaching the adult stage. The adult has a length of up to 1½ mm. The development from egg to adult lasts about 1 week. The nematodes can survive in infected tubers but not in a dehydrated state.

Vernacular names
• Deutsch: Älchenkrätze der Kartoffel
• English: potato tuber nematode
potato rot nematode
• Español: anguilulosis de la patata
• Français: nématode de la pomme de terre

For details see the respective page in Wikipedia.