Effect of Alternaria cassiae, Pseudocercospora nigricans, and soybean (Glycine max) planting density on the biological control of sicklepod (Senna obtusifolia)

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dc.contributor.authorPitelli, Robinson A. [UNESP]
dc.contributor.authorCharudattan, R.
dc.contributor.authorDevalerio, James T.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Florida
dc.date.accessioned2014-05-27T11:19:32Z
dc.date.available2014-05-27T11:19:32Z
dc.date.issued1998-01-01
dc.description.abstractThe interactions of two fungal biocontrol agents, Alternaria cassiae and Pseudocercospora nigricans, and soybean planting density on sicklepod mortality and dry weight were studied in the field over 2 yr. The experimental field was divided into three equal areas: one without soybean and two where the soybean was sown in densities of 20 and 36 seeds per meter row with a 0.95-m row spacing. The fungi were sprayed alone or in a mixture at three growth stages of sicklepod plants grown at three levels of crop interference resulting from the three soybean planting densities. The fungal treatments were: an untreated control, A. cassiae (105 spores/m2), P. nigricans (3.3 g mycelium/m2), and the mixture of these two fungi. Sicklepod was at the cotyledonary leaf, two-leaf, and four-leaf stages when treated. Alternaria cassiae was most effective in reducing both sicklepod survival and dry weight. The mixture of P. nigricans and A. cassiae was generally comparable to but not better than A. cassiae alone in killing the weed (mortality) and reducing its growth (dry weight). Soybean density did not have significant effects on the mortality or the dry weight of sicklepod. Thus, there is no advantage to combining the highly effective biocontrol agent A. cassiae with the less effective P. nigricans or with soybean interference to control sicklepod. However, the results validate the efficacy of A. cassiae by itself as a bioherbicide.en
dc.description.affiliationSao Paulo State University, Jaboticabal, Sao Paulo
dc.description.affiliationUniversity of Florida, Gainesville, FL 32611
dc.description.affiliationUnespSao Paulo State University, Jaboticabal, Sao Paulo
dc.format.extent37-40
dc.identifierhttp://www.jstor.org/stable/3988686
dc.identifier.citationWeed Technology, v. 12, n. 1, p. 37-40, 1998.
dc.identifier.issn0890-037X
dc.identifier.scopus2-s2.0-0031953036
dc.identifier.urihttp://hdl.handle.net/11449/65376
dc.language.isoeng
dc.relation.ispartofWeed Technology
dc.relation.ispartofjcr1.246
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectBiocontrol
dc.subjectBioherbicide
dc.subjectCassia obtusifolia
dc.subjectCompetition
dc.subjectIntegrated weed management
dc.subjectbiological pest control
dc.subjectmycelium
dc.subjectseed oil
dc.subjectAlternaria cassiae
dc.subjectGlycine max
dc.subjectPseudocercospora nigricans
dc.subjectSenna obtusifolia
dc.titleEffect of Alternaria cassiae, Pseudocercospora nigricans, and soybean (Glycine max) planting density on the biological control of sicklepod (Senna obtusifolia)en
dc.typeArtigo
dcterms.licensehttp://www.jstor.org/page/info/about/policies/terms.jsp
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt

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