Estimativa de custo de produção de soja, safra 1996/97.

bitstream/item/38996/1/COT-13-1996.pd

Estimativa de custo de produção de milho, safra 1996/97.

bitstream/item/65969/1/CPAO-COM.-TEC.-14-96.pd

Ocorrência do Barley/Cereal yellow dwarf virus e seus vetores em cereais de inverno no Rio Grande do Sul, Santa Catarina, Paraná e Mato Grosso do Sul em 2008.

bitstream/CNPT-2010/40746/1/p-co256.pd

Nanismo amarelo em cereais de inverno no Rio Grande do Sul em 2007.

E em: Tropical Plant Pathology, Brasília, DF, v. 33, p. S288, ago. 2008. Suplemento, ref VIR-012. Edição dos Resumos do XLI Congresso Brasileiro de Fitopatologia, Belo Horizonte, ago. 2008

DIMBOA levels in hexaploid Brazilian wheat are not associated with antibiosis against the cereal aphids Rhopalosiphum padi and Sitobion avenae.

The objective of this study was to evaluate the natural levels of the plant defence compound DIMBOA in young leaves of eight hexaploid Brazilian wheat genotypes and the impact of the genotypes upon development of cereal aphids, Rhopalosiphum padi and Sitobion avenae. HPLC Analysis revealed that the DIMBOA levels varied from 5.376 (in BRS Guabiju) to 30.651 mmol/kgFW (in BRS Timbaúva) with two genotypes outperforming Solstice, a UK variety used as reference. Bioassays were conducted to evaluate the development and fecundity of both aphids when grown on the wheat genotypes. Although BRS Guabiju and BRS Timbaúva were among the genotypes showing the highest and lowest susceptibility respectively, against both aphids, no correlation could be found between DIMBOA levels and antibiosis effects. The cultivar BRS 327 that was among the genotypes showing lower intrinsic rate of population increase for the two aphid species. Elucidating the role of secondary metabolites in plant resistance to aphids and the characterisation of the genotypes that allowed reduced aphid development are important steps to achieve a better natural resistance in hexaploid Brazilian wheat

Barley yellow dwarf virus-PAV in Brazil: seasonal fluctuation and biological characteristics.

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