Titre du document / Document title

Suppression of wheat growth and yield by Pratylenchus neglectus in the Pacific northwest

Auteur(s) / Author(s)

SMILEY Richard W. ⁽¹⁾ ; WHITTAKER Ruth G. ⁽¹⁾ ; GOURLIE Jennifer A. ⁽¹⁾ ; EASLEY Sandra A. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Oregon State University, Columbia Basin Agricultural Research Center, P.O. Box 370, Pendleton 97801, ETATS-UNIS

Résumé / Abstract

Many wheat (Triticum aestivum) fields planted annually in the Pacific Northwest are infested by high populations of the lesion nematode, Pratylenchus neglectus. Spring wheat cultivars varying in tolerance and resistance to P. neglectus were treated or not treated with aldicarb to examine relationships between the nematode and growth and yield of annual direct-seeded (no-till) wheat. Increasing initial density of P. neglectus in soil was more strongly associated with declining growth and yield of intolerant (Machete and Spear) than moderately tolerant (Frame and Krichauff) cultivars. Yield suppression by P. neglectus was generally 8 to 36% for intolerant cultivars, but reached 71% in soil also harboring Heterodera avenae, Rhizoctonia solani AG-8, and Gaeumannomyces graminis var. tritici. Intolerant cultivars had lower yields than Krichauff in rainfed but not in irrigated experiments. Density of P. neglectus in mature roots was generally lower for moderately resistant Krichauff than for susceptible Machete and Spear. Aldicarb improved yields in irrigated but not in rainfed experiments, and increased plant height and reduced variability in tiller height, canopy temperature, and density of P. neglectus in roots. This is the first report of damage to wheat by P. neglectus in the Pacific Northwest. Breeding wheat for tolerance and resistance to P. neglectus is suggested.

Revue / Journal Title

Plant disease   ISSN 0191-2917   CODEN PLDIDE 

Source / Source

2005, vol. 89, n^o9, pp. 958-968 [11 page(s) (article)] (51 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Phytopathological Society, St. Paul, MN, ETATS-UNIS  (1980) (Revue)

Mots-clés anglais / English Keywords

Ascomycetes ; Thallophyta ; Fungi ; Fungi Imperfecti ; Systemic ; Pesticides ; Insecticide ; Carbamate ; Cereal crop ; Pacific Ocean ; Invertebrata ; Helmintha ; Nemathelminthia ; Nematoda ; Spermatophyta ; Angiospermae ; Monocotyledones ; Gramineae ; Root ; Irrigation ; Gaeumannomyces graminis ; Rhizoctonia solani ; Heterodera avenae ; Soils ; Aldicarb ; Resistance ; Lesion ; Northwest Pacific ; Yield ; Suppression ; Cultivar ; Pratylenchus neglectus ; Triticum aestivum ;

Mots-clés français / French Keywords

Ascomycetes ; Thallophyta ; Fungi ; Fungi Imperfecti ; Systémique ; Pesticide ; Insecticide ; Carbamate ; Plante céréalière ; Océan Pacifique ; Invertebrata ; Helmintha ; Nemathelminthia ; Nematoda ; Spermatophyta ; Angiospermae ; Monocotyledones ; Gramineae ; Racine ; Irrigation ; Gaeumannomyces graminis ; Rhizoctonia solani ; Heterodera avenae ; Sol ; Aldicarbe ; Résistance ; Lésion ; Océan Pacifique Nord Ouest ; Rendement ; Suppression ; Cultivar ; Pratylenchus neglectus ; Triticum aestivum ;

Mots-clés espagnols / Spanish Keywords

Ascomycetes ; Thallophyta ; Fungi ; Fungi Imperfecti ; Sistémico ; Plaguicida ; Insecticida ; Carbamato ; Planta cerealista ; Océano Pacífico ; Invertebrata ; Helmintha ; Nemathelminthia ; Nematoda ; Spermatophyta ; Angiospermae ; Monocotyledones ; Gramineae ; Raíz ; Irrigación ; Gaeumannomyces graminis ; Rhizoctonia solani ; Heterodera avenae ; Suelo ; Aldicarb ; Resistencia ; Lesión ; Océano Pacífico Noroeste ; Rendimiento ; Supresión ; Cultivar ; Pratylenchus neglectus ; Triticum aestivum ;

Mots-clés d'auteur / Author Keywords

Fusarium crown rot ; Fusarium pseudograminearum ; Pratylenchus thornei ; Pythium root rot ; Pythium spp ; Rhizoctonia root rot ; take-all ;

Localisation / Location

INIST-CNRS, Cote INIST : 12673, 35400013240024.0060