Ditylenchus


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Ditylenchus

 

a genus of roundworms, or nematodes, of the family Tylenchidae. The body is long, thin, and pointed. Adult worms are 0.8–1.5 mm long and 0.02–0.03 mm in diameter. The entire life cycle is passed in plant tissues. The most dangerous species are D. destructor, which infests potatoes, and D. dipsaci, which infests onions, garlic, parsnip, parsley, tomatoes, clover, and cereal grains. The nematodes attack bulbs, tubers, rhizomes, and stems. When the infected plant dies, the worms either drop onto the soil and search for a new host or remain in the tissues of the dead plant. The worms can be controlled by returning affected crops to their former position in the crop rotation no more often than once every three years.

REFERENCE

Kir’ianova, E. S., and E. L. Krall’. Paraziticheskie nematody raslenii imery bor’by s nimi, vol. 2. Leningrad, 1971.
References in periodicals archive ?
Ditylenchus gallaeformans remains external to plant tissues, and induces galls by feeding on the meristematic cell surfaces of Miconia spp.
All genera have a fairly stable number, mostly 2n = 16 or 2n = 18, except the genus Ditylenchus Filipjev, 1936, whose only species studied D.
The nematological analysis nematodes associated with viticulture revealed the present of sixteen kinds of nematode divided according to their diets 4 trophic groups whose phytophagous are the most abundant (Paratylenchus sp., Pratylenchus spp., Tylenchus sp., Tylenchorhynchus sp., Helichotylenchus sp., Scutellonema spp., and Xiphinema sp.), followed by fungivorous (Aphelenchus sp., Aphelenchoides spp., Ditylenchus spp.
The nematodes Helicotylenchus sp., Tylenchus sp., Ditylenchus sp., Pratylenchus sp., Criconemella spp., Boleodurus sp.
Because of this, growers face serious problems under continuous cropping including growth retardation, plant mortality and Ditylenchus destructor infestation.
Like alfa alfa shoot stunting by Ditylenchus dipsaci [20] potato cyst by Globodera species and certain grape diseases are due to Xiphinema index [21].
China, for example, will not allow Cambodian rice to be imported unless the government can certify that the milled rice exported to China are free from the following quarantine pests of Chinese concern: Leptochloa chinensis, Striga asiatica, Apenlenchoides besseyi, Ditylenchus angustus.
sibthorpii were Chiloplacus, Malenchus and Ditylenchus, although not in the same order.
Solanaceae: Rishitin is a sesquiterpenoid phytoalexin found in potato tuber discs (Solanum tuberosum), which infected with the potato rot nematode Ditylenchus dipsaci [29].
Chizhov, "Length variation and repetitive sequences of Internal Transcribed Spacer of ribosomal RNA gene, diagnostics and relationships of populations of potato rot nematode, Ditylenchus destructor Thorne, 1945 (Tylenchida: Anguinidae)," Nematology, vol.