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Essential oil of mustard to control Rhizoctonia solani causing seedling damping off and seedling blight in nursery Trop. Plant Pathol.
Dhingra,Onkar D.; Costa,Maria L. N.; Silva, Jr.,Geraldo J.; Mizubuti,Eduardo S. G..
The essential oil extracted from mustard (Brassica rapa) seeds was evaluated for its effect on suppression of Rhizoctonia solani growth in vitro, and in field soils, for reducing saprophytic substrate colonization and seedling damping off and blight using snap beans as indicator plant, the in vitro growth was completely inhibited at a concentration of 50 mul/l. The saprophytic substrate colonization in soils 24 h after treatment was drastically reduced to 45% at 150 mul/kg soil concentration, in contrast to 100% colonization at concentrations of 0, 50, or 75 mul/kg. This recovery rate gradually declined to 6% and 60%, respectively, in nine days. A control of pre and post-emergence seedling damping off and blight in common beans (Phaseolus vulgaris),...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Allyl isothiocyanate; Flavoring agent; Soil treatment; Nursery.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000600017
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Influence of internal seedborne Fusarium semitectum on cotton seedlings Trop. Plant Pathol.
Costa,Maria L. N.; Dhingra,Onkar D.; Silva,Janaina L. da.
Fusarium semitectum was found to be the major seed colonizing fungus in the commercial acid delinted cotton (Gossypium hirsutum) seed lots. There was no correlation, however, between its incidence and seedling emergence and disease symptoms on the emerged seedlings in autoclaved sand. Inoculation technique simulating internally seedborne nature of the fungus showed that the observed non-correlation might be related to the threshold level of seed coat colonization. The internally seedborne inoculum besides reducing seedling emergence, incited an array of symptoms on the emerged seedlings, which ranged from negative geotropism, leaf tearing, collar rot leading to dry root rot and seedling mortality. The dry root rot continued to develop on the plants...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Negative geotropism; Root rot; Seedborne inoculum; Cotton diseases; Gossypium hirsutum.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582005000200014
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