Pesquisa Agropecuária Brasileira (2002) 37, 251-257

Renato Fernando Amabile, Caroline Machado Vasconcelos and Antônio Carlos Gomes (2002)
Severidade da mancha-de-alternária em cultivares de girassol na região do Cerrado do Distrito Federal
[Severity of alternaria in sunflower crop in the Cerrado region of Federal District, Brazil]
Pesquisa Agropecuária Brasileira 37 (3), 251-257
Abstract: Severity of alternaria leaf spot was evaluated in five genotypes of sunflower as a result of two densities of population and two sowing dates. The experiments were conducted in the Embrapa-Centro de Pesquisa Agropecuária dos Cerrados experimental field, at Planaltina, DF, Brazil, on the crop season of 1998/1999 on an Oxisol soil. The experimental design was in randomized blocks in a 5 x 2 factorial with three replicates. The percentage of infected plants was estimated based on weekly observations considering scores from 0 to 5 in lower, middle and upper parts of the plant. The occurrence of alternaria was not influenced by density of population of 42,000 or 49,000 plants/ha. All cultivars were susceptible to the disease. The climatic conditions for each sowing date changed the disease severity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
surveys/sampling/distribution
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Alternariaster helianthi	Sunflower (Helianthus annuus)	Brazil (south)