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Inhibition of the germination and growth of Phymatotrichopsis omnivora cotton root rot by oilseed meals and isothiocyanates

Coimbra, Joao Carlos; Pinto, Iraja Damiani; Wurdig, Norma Luiza; Do Carmo, Dermeval Aparecido

Applied Soil Ecology 49(none): 0-75

2011


ISSN/ISBN: 0929-1393
DOI: 10.1016/j.apsoil.2011.06.014
Accession: 036156618

The meals (co-products remaining after oil extraction) from many oilseed crops contain biocidal chemicals that are known to inhibit the growth and activity of some soil microorganisms including several plant pathogens. The fungus Phymatotrichopsis omnivora (Duggar) Hennebert is the causal agent of cotton root rot that has greatly hindered the production of cotton and alfalfa in Texas and the southwestern USA. We investigated the effect of oilseed meals from both brassicaceous plants including mustard and camelina as well as non-brassicaceous plants including jatropha, flax, and Chinese tallow on P. omnivora sclerotial germination and hyphal growth in Branyon clay soil, as. Highlights: Seed meals of mustard, camelina, and jatropha inhibited Phymatotrichopsis omnivora sclerotial germination and hyphal growth in Branyon clay. Allyl, butyl, phenyl, and benzyl isothiocyanates inhibited Phymatotrichopsis omnivora OKAlf8 hyphal growth on PDA. Mustard and allyl isothiocyanates were most effective.

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