Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease
The brown pud disease caused by phytophthora leads to serious loss of production in cocoa growing areas. The priority area of the flight was the selection of cocoa-trees with low sensitivity to this disease. The search for cocoa-trees with total resistance remained vain in spite of several attempts made. This suggests to the existence of partial resistance which is probably very polygenic. The transmission of characters of resistance to this disease seems to be mainly additive. Nevertheless, ignorance about the species of phytophthora which causes this disease has for a long time delayed the progress made by genetic control because each species has special epidemiological characteristic which require specific methods of control. The scope of losses in a given country therefore depends on the species found there and climatic conditions. Since 1980, four main species of phytophthora which cause cocoa disease have been characterized : P. megakarya (Africa), P. palmivora (all cocoa zones), P. capsici Acacoa (America) and P. citrophthora at Brazil. Within the framework of this study, we will only talk about the results obtained with the two most aggressive ones (P. megakarya and P. palmivora). The large collection of material isolated from these two diseases causing agents found at CIRAD Montpellier (about 900 stems), from all cocoa growing areas enabled us to carry out the following work with the objectives being: to characterize the level of aggressiveness of stems representative of P. megakarya and P. palmivora (isolated in 1994-95). (Texte intégral)
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Subjects: | H20 - Maladies des plantes, Theobroma cacao, Phytophthora palmivora, pouvoir pathogène, http://aims.fao.org/aos/agrovoc/c_7713, http://aims.fao.org/aos/agrovoc/c_27307, http://aims.fao.org/aos/agrovoc/c_5629, |
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dig-cirad-fr-4769692024-01-28T08:42:10Z http://agritrop.cirad.fr/476969/ http://agritrop.cirad.fr/476969/ Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease. Ducamp Michel, Herail Claude, Nyassé Salomon, Cilas Christian, Paulin Didier. 2000. In : 13 Conférence internationale sur la recherche cacaoyère : résumés = 13 International cocoa research conference: summaries ; 13 Conferencia internacional de pesquisas em cacau : resumos ; 13 Conferencia internacional de investigacion en cacao : resumenes. Lagos : Cocoa Producers' Alliance, 1 p. Conférence Internationale sur la Recherche Cacaoyère. 13, Kota Kinabalu, Malaisie, 9 Octobre 2000/14 Octobre 2000. Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease Ducamp, Michel Herail, Claude Nyassé, Salomon Cilas, Christian Paulin, Didier eng 2000 Cocoa Producers' Alliance 13 Conférence internationale sur la recherche cacaoyère : résumés H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 The brown pud disease caused by phytophthora leads to serious loss of production in cocoa growing areas. The priority area of the flight was the selection of cocoa-trees with low sensitivity to this disease. The search for cocoa-trees with total resistance remained vain in spite of several attempts made. This suggests to the existence of partial resistance which is probably very polygenic. The transmission of characters of resistance to this disease seems to be mainly additive. Nevertheless, ignorance about the species of phytophthora which causes this disease has for a long time delayed the progress made by genetic control because each species has special epidemiological characteristic which require specific methods of control. The scope of losses in a given country therefore depends on the species found there and climatic conditions. Since 1980, four main species of phytophthora which cause cocoa disease have been characterized : P. megakarya (Africa), P. palmivora (all cocoa zones), P. capsici Acacoa (America) and P. citrophthora at Brazil. Within the framework of this study, we will only talk about the results obtained with the two most aggressive ones (P. megakarya and P. palmivora). The large collection of material isolated from these two diseases causing agents found at CIRAD Montpellier (about 900 stems), from all cocoa growing areas enabled us to carry out the following work with the objectives being: to characterize the level of aggressiveness of stems representative of P. megakarya and P. palmivora (isolated in 1994-95). (Texte intégral) conference_item info:eu-repo/semantics/conferenceObject Conference info:eu-repo/semantics/closedAccess http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=162574 |
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H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 |
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H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 Ducamp, Michel Herail, Claude Nyassé, Salomon Cilas, Christian Paulin, Didier Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
description |
The brown pud disease caused by phytophthora leads to serious loss of production in cocoa growing areas. The priority area of the flight was the selection of cocoa-trees with low sensitivity to this disease. The search for cocoa-trees with total resistance remained vain in spite of several attempts made. This suggests to the existence of partial resistance which is probably very polygenic. The transmission of characters of resistance to this disease seems to be mainly additive. Nevertheless, ignorance about the species of phytophthora which causes this disease has for a long time delayed the progress made by genetic control because each species has special epidemiological characteristic which require specific methods of control. The scope of losses in a given country therefore depends on the species found there and climatic conditions. Since 1980, four main species of phytophthora which cause cocoa disease have been characterized : P. megakarya (Africa), P. palmivora (all cocoa zones), P. capsici Acacoa (America) and P. citrophthora at Brazil. Within the framework of this study, we will only talk about the results obtained with the two most aggressive ones (P. megakarya and P. palmivora). The large collection of material isolated from these two diseases causing agents found at CIRAD Montpellier (about 900 stems), from all cocoa growing areas enabled us to carry out the following work with the objectives being: to characterize the level of aggressiveness of stems representative of P. megakarya and P. palmivora (isolated in 1994-95). (Texte intégral) |
format |
conference_item |
topic_facet |
H20 - Maladies des plantes Theobroma cacao Phytophthora palmivora pouvoir pathogène http://aims.fao.org/aos/agrovoc/c_7713 http://aims.fao.org/aos/agrovoc/c_27307 http://aims.fao.org/aos/agrovoc/c_5629 |
author |
Ducamp, Michel Herail, Claude Nyassé, Salomon Cilas, Christian Paulin, Didier |
author_facet |
Ducamp, Michel Herail, Claude Nyassé, Salomon Cilas, Christian Paulin, Didier |
author_sort |
Ducamp, Michel |
title |
Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
title_short |
Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
title_full |
Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
title_fullStr |
Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
title_full_unstemmed |
Characterization and evolution of the level of aggressiveness of the various Phytophthora megakarya and Phytophthora palmivora which cause cocoa disease |
title_sort |
characterization and evolution of the level of aggressiveness of the various phytophthora megakarya and phytophthora palmivora which cause cocoa disease |
publisher |
Cocoa Producers' Alliance |
url |
http://agritrop.cirad.fr/476969/ |
work_keys_str_mv |
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1792494777548144640 |