Data/hora: 24/06/2024 00:55:01

Biblioteca(s): | Embrapa Meio Norte / UEP-Parnaíba.
Data corrente: | 16/09/1992
Data da última atualização: | 16/09/1992
Autoria: | LAWRENCE, J. S.
Título: | Evaluation of methods for assessing resistance of cacao Theobroma cacao L. cultivars and hybrids to Phytophthora.
Ano de publicação: | 1978
Fonte/Imprenta: | Itabuna: Comissao Executiva do Plano da Lavoura Cacaueira, 1978.
Páginas: | 47p.
Série: | (Boletim Tecnico, 62).
Idioma: | Inglês
Conteúdo: | This study was conducted to select or develop a rapid and easy but reliable standardized inoculation method for preliminary screening of cacao for resistance to P. palmivora. Previously published methods and various modifications of some of them were examined using the same cacaocultivars and the same P. palmivora isolate throughout. Results from these methods were compared with each other and with data of natural infection in the field. Screening methods examined were: 1)Inoculation of attached pods using zoospore suspension without wounding or mixed mycelial-sporangial suspension with and without wounding, 2) Inoculationof detached pods using zoospore suspension with and without wounding, 3) Inoculation of blocks of pod pericarp tissue with zoosporesuspension, 4) Inoculation with mycelium-agar discs of seedling-stems and branches on the tree, 5) Inoculation of attached leaves with mycelium-agar disc or zoospore suspension, 6) Inoculation of seedling rootswith zoospore suspension, 7) Inoculation of germinated seeds with zoospore suspension or mycelial-sporangial suspension. Methods varied in the degree with they differentiated between resistant and susceptible cultivar reactions, and in consistency over replicated tests. However, the most resistant cultivars (Pound 7, Scavina 6, Scavina 12 and Catongo) were graded as resistant in most methods. The most reliable screening method for use with fruiting trees was point-inoculation of unwounded attached pods using zoospore suspension and recording percentage
Palavras-Chave: | Cacao-bean; Periodic; Periodicos.
Thesagro: | Cacau.
Thesaurus Nal: | Theobroma.
Categoria do assunto: | --
Registro original: | Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)
Exemplares: | CPAMN-UEPP - (1445-1) - ADD - FL - -- -  -  - 1992.02030 - DIS