Potencial de Lecanicillium longisporum no controle do oídio da abobrinha.

2008

Óleo de nim (Azadirachta indica) estimula o crescimento micelial de agentes de biocontrole.

2008

Comunidade de leveduras do fitoplano de lírio originário de produção convencional e integrada dos problemas fitossanitários.

2008

Avaliação de isolados de Trichoderma sp. e Clonostachys rosea selecionados para o controle biológico de mofo-branco como agentes promotores de crescimento em feijoeiro.

2008

Genetic structure and mating type analysis of the Pyricularia oryzae population causing widespread epidemics in southern Brazil.

Blast is a major disease of rice in Brazil, the largest rice-producing country outside Asia. This study aimed to assess the genetic structure and mating-type frequency in a contemporary Pyricularia oryzae population, which caused widespread epidemics during the 2012/13 season in the Brazilian lowland subtropical region. Symptomatic leaves and panicles were sampled at flooded rice fields in the states of Rio Grande do Sul (RS, 34 fields) and Santa Catarina (SC, 21 fields). The polymorphism at ten simple sequence repeats (SSR or microsatellite) loci and the presence of MAT1-1 or MAT1-2 idiomorphs were assessed in a population comprised of 187 isolates. Only the MAT1-2 idiomorph was found and 162 genotypes were identified by the SSR analysis. A discriminant analysis of principal components (DAPC) of SSR data resolved four genetic groups, which were strongly associated with the cultivar of origin of the isolates. There was high level of genotypic diversity and moderate level of gene diversity regardless whether isolates were grouped in subpopulations based on geographic region, cultivar host or cultivar within region. While regional subpopulations were weakly differentiated, high genetic differentiation was found among subpopulations comprised of isolates from different cultivars. The data suggest that the rice blast pathogen population in southern Brazil is comprised of clonal lineages that are adapting to specific cultivar hosts. Farmers should avoid the use of susceptible cultivars over large areas and breeders should focus at enlarging the genetic basis of new cultivars.

Adubação nitrogenada foliar e incidência da podridão parda (Monilinia fructicola) em pêssegos da cultivar 'Chimarrita'.

2011

Adubação orgânica e as consequências na podridão parda (Monilinia fructicola) em pêssegueiros da cultivar 'chimarrita'.

2011

Avaliação agronômica de videiras infectadas por vírus.

2011

Inativação térmica do crescimento micelial de Cylindrocarpon destructans.

2011

Atividade fungitóxica de produtos alternativos sobre Elsinoe ampelina.

2011

A black foot extract can delay downy mildew progress in grapevine under greenhouse conditions.

2011

Boro, aplicação foliar e conseqüências na podridão parda (Monilinia fructicola) em pêssegos da cultivar 'Chimarrita'.

2011

Aplicação foliar de cálcio e consequências na podridão parda (Monilinia fructicola) em pêssegueiros da cultivar 'Chimarrita'.

2011

Aplicação de potássio e cálcio diminui a incidência de Monilinia fructicola em pessegueiro.

2011

No evidence of transmission of grapevine leafroll-associated viruses by phylloxera (Daktulosphaira vitifoliae).

Abstract Grapevine leafroll disease is associated with several species of phloem-limited grapevine leafrollassociated viruses (GLRaV), some of which are transmitted by mealybugs and scale insects. The grape phylloxera, Daktulosphaira vitifoliae (Fitch) Biotype A (Hemiptera: Phylloxeridae), is a common vineyard pest that feeds on the phloem of vine roots. There is concern that these insects may transmit one or more GLRaV species, particularly GLRaV-2, a species in the genus Closterovirus. A field survey was performed in vineyards with a high incidence of grapevine leafroll disease and D. vitifoliae was assessed for acquisition of GLRaV. In greenhouse experiments, the ability of D. vitifoliae to transmit GLRaV from infected root sections or vines to co-planted virus-free recipient vines was tested. There were no GLRaV-positive D. vitifoliae in the field survey, nor did D. vitifoliae transmit GLRaV- 1, ?2, ?3, or -4LV in greenhouse transmission experiments. Some insects tested positive for GLRaV after feeding on infected source vines in the greenhouse, however there was no evidence of virus transmission to healthy plants. These findings, in combination with the sedentary behaviour of the soil biotype of D. vitifoliae, make it unlikely that D. vitifoliae is a vector of any GLRaV.