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Título

Evaluation of Spanish isolates of Plasmopara halstedii for tolerance to metalaxyl

AutorMolinero-Ruiz, Leire ; Domínguez, Juan; Melero-Vara, José M.
Palabras claveDowny mildew
Fungicide tolerance
Sunflower
Fecha de publicaciónsep-2000
EditorUniversity of Novi Sad
CitaciónHelia, 23 (33) 33-38 (2000)
ResumenOne out of 42 Spanish isolates of P.halstedii ascribed to races 1, 2, 4, 6, 7 or 10 showed consistent tolerace to metalaxyl when seeds of sanflower 'Peredovik', treated with this fungicide at 2 g.a.i./kg, were inoculated by whole-seeding dipping. When this metalaxyl-tolerant isolate of P.halstedii was inoculated to sunflower seedings by this method, the fungicide seemed to affect neither zoosporangia nor zoospores. In contrast, the incidence of seedlings with high sporulation on cotyledons after 10-12-day incubation was significantly decreased with increasing dosages of metalaxyl applied to the seeds of sunflower. EC50 of this tolerant isolate of P.halstedii was estimated at 3.5-54 g.a.i./kg
Descripción6 pages; 1 figure; 1 table
URIhttp://hdl.handle.net/10261/22344
ISSN1018-1806
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