GERMINAÇÃO DE Urochloa brizantha CV. MARANDU APÓS O TRATAMENTO DAS SEMENTES COM FUNGICIDA E ESCARIFICAÇÃO MECÂNICA

Abstract

RESUMOA Brachiaria spp. assim como outras forrageiras, são destinadas principalmente para pastejo, corte, conservação do solo ou uso direto para produção de sementes, na qual é necessária para suprir a cadeira produtiva. Porém o elevado índice de dormência nas sementes de gramíneas e o ataque de fungos dificultam a germinação dessas espécies. Sendo assim, o objetivo deste trabalho foi avaliar a germinação das sementes de Urochloa brizantha, c.v. Marandu, após escarificação mecânica e tratamento com fungicida. O experimento foi conduzido na unidade de beneficiamento de sementes e laboratório de análise de sementes localizado em Presidente Prudente/SP. Avaliou-se a germinação e os valores obtidos foram submetidos à análise de variância e teste de médias usandoTukey, ao nível de 5% de probabilidade. Concluiu-se que, sementes não escarificadas tratadas com fungicida melhoram a germinação das sementes de Urochloa brizantha cv. Marandu. Palavras-chave: Forrageira. Escarificação. Dormência. Brachiaria spp. Tetrazólio. GERMINATION OF Urochloa brizantha CV. MARANDU AFTER TREATMENT OF SEEDS WITH FUNGICIDE AND MECHANICAL SCARIFICATION ABSTRACTBrachiaria spp. as well as other forages, are mainly intended for grazing, cutting, soil conservation or direct use for seed production, in which it is necessary to supply the productive chair. However, the high dormancy index in grass seeds and the fungus attack make the germination of these species difficult. Therefore, the objective of this work was to evaluate the germination of the seeds of Urochloa brizantha, c.v. Marandu, after mechanical scarification and treatment with fungicide. The experiment was conducted at the seed processing unit and seed analysis laboratory located in Presidente Prudente / SP. The germination was evaluated and the values obtained were submitted to analysis of variance and test of means using Tukey, at the level of 5% of probability. It was concluded that non-scarified seeds treated with fungicide improved the germination of the seeds of Urochloa brizantha cv. Marandu.

Fungi associated with Paspalum guenoarum seeds: their impact on physiology and control

“…Despite the fact that several authors have detected phytopathogenic fungi associated with forage seeds (LA VALE et al, 2017;MALLMANN et al, 2013;SANToS et al, 2014), there is a relative lack of reports of the occurrence and control of fungal pathogens in P. guenoarum seeds. GASPARETTo et al (2017) has been one of the first reports to describe fungi associated with P. guenoarum seeds; although no attempts to control them was done so far.…”