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 ?
The completion of this study allowed us to identify sixteen genera of nematode in ten vineyards of western Algeria represented by: Pratylenchus, Paratylenchus, Scutellonema, Tylenchorhynchus, Xiphinema, Helicotylenchus, Aphelenchoides, Aphelenchus, Ditylenchus, Psilenchus, Tylenchus Rhabditis, Cephalobus, Chiloplacus, Mononchus and Dorylaimus.
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.
Maize: Ditylenchus angustus, Tylenchorhynchus annulatus, Pratylencus pratensis, Lebronema thorne, Trichodorus pakistanensis, Haplolaimus seinhorstei, Helicotylenchus dihystera, Meloidogyne incognita, M.
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].
2005, Alarcon 2007, Lopez & Castano 2012), han permitido identificar la presencia de seis generos de hongos: Rhizpctonia, Fusarium, Pestalotia, Curvularia, Helminthosporium y Colletotrichum, tres generos de bacterias: Erwinia, Ralstonia y Pseudomonas, siete generos de nematodos fitoparasitos: Meloidogyne, Helicotylenchus, Tylenchus, Ditylenchus, Aphelenchoides, Rotylenchus, Pratylenchus y Radopholus, y dos generos de virus: Banana Streak Virus (BSV, Badnavirus) y Cucumber Mosaic Virus (CMV, Cucumovirus).
Por otra parte, el segundo orden dominante en cuanto a numero de generos fue Tylenchida destacandose que la mayoria de nematodos, a excepcion del genero Ditylenchus, fueron fitoparasitos, encontrandose la familia Hoplolaimidae con el genero Helicotylenchus (Figura 13), la familia Criconematidae con los generos Criconema (Figura 14) y Hemicycliophora (Figura 15), coincidiendo la identificacion de estos generos con los registrados por LEGUIZAMO & PARADA (2008) en ecosistemas naturales de la altillanura en el departamento del Meta; la familia Pratylenchidae con los generos Pratylenchus (Figura 16) y Rotylenchulus (Figura 17) y la familia Tylenchidae con el genero Tylenchus (Figura 18), los cuales fueron encontrados en mayor proporcion en las muestras de raices con 5.