Variation in susceptibility of 'Grand Naine' (AAA) to Colletotrichum musae, one of the causal agents of crown rot, in relation to fruit position in the bunch

Lassois Ludivine, Jijakli M. Haïssam, De Lapeyre de Bellaire Luc. 2007. Variation in susceptibility of 'Grand Naine' (AAA) to Colletotrichum musae, one of the causal agents of crown rot, in relation to fruit position in the bunch. In : First ISHS : ProMusa ProMusa Symposium: Recent advances in banana crop protection for sustainable production and improved livelihoods, White River, South Africa, 10-14 september 2007. ISHS. Montpellier : Cirad, 1 p. International Symposium on recent advances in banana crop protection for sustainable production and improved livelihoods. 1, White River, Afrique du Sud, 10 Septembre 2007/14 Septembre 2007.

Résumé : Crown rot, caused by a parasitic complex, is one of the main post-harvest diseases affecting bananas. Colletotrichum musae is often regarded as one of the most prevalent fungi contributing to the crown rot complex. Geographical and seasonal variations in symptom expression have been observed for disease caused by C. musae. It has been suggested that this phenomenon results partially from variations at the level of fruit quality potential. Quality potential is controlled by a physiological component, but also by a parasitic component, which appears as the level of banana contamination. The physiological component of the fruit quality potential determines fruit susceptibility, i.e. the response of the fruit to inoculum pressure. For better knowledge of the mechanisms influencing fruit susceptibility to crown rot, the within-bunch variability of fruit susceptibility was evaluated. For this, one bunch per week reaching 900 degree-days (dd) as calculated by the method of Ganry (1978) was harvested at the Diadia station (PHP, Njombé, Cameroon) over a 10-week period. Bunches harvested were equivalent in size with no observable defects. Hands were numbered from 1 to 8 according to their order of appearance on the bunch (hand 1: top of the bunch, hand 8: bottom of the bunch, near the final bud). The susceptibility of each hand was evaluated. Statistical test showed highly significant (p<0.001) within-bunch variability in fruit susceptibility to C. musae. The fruits of hands 1 to 3 showed statistically the same susceptibility and appeared as the most susceptible, with an internal necrotic surface (INS) average of 138.3 mm2. The second statistical group comprised the fruits of hands 4 to 8 and had an INS average of 87 mm2. A strict linear correlation (R=0.95) was observed between INS and hand position in the bunch.

Mots-clés Agrovoc : Musa, banane, Colletotrichum, anthracnose, facteur du milieu, développement biologique, fruit (botanique), récolte

Mots-clés complémentaires : Pourriture de la couronne, Colletotrichum musae

Classification Agris : H20 - Maladies des plantes
J11 - Manutention, transport, stockage et conservation des produits d'origine végétale

Auteurs et affiliations

• Lassois Ludivine, Gembloux Agricultural University (BEL)
• Jijakli M. Haïssam, Gembloux Agricultural University (BEL)
• De Lapeyre de Bellaire Luc, CIRAD-PERSYST-UPR Systèmes bananes et ananas (CMR) ORCID: 0000-0003-1243-0887

Source : Cirad - Agritrop (https://agritrop.cirad.fr/542556/)

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