Contribution à la mise au point d'une méthode de lutte biologique contre la maladie des pourritures de la couronne de la banane

The antagonist activity of two yeast strains (Pichia anómala K strain and Candida oleophila O strain) against the parasitic complex responsible for crowns rot of banana has been evaluated. Their efficiency has been tested on three separated fungi: Colletotrichum musae, Fusarïum moiliforme, Cephalosporium sp. and on a parasitic complex formed by the association of these three fungi. Antagonist effects have been observed both on the two first fungi and on the complex. Strain O added at 108 ufc/ml on crowns which were previously inoculated with the complex showed the highest protection (56,0 %). This protection was superior to those observed against the fungi inoculated separately. The influence of the time between the addition of the O strain (10" ufc/ml) and the inoculation of the pathogens on the level of protection has also been measured. It appeared that protection by the O strain was remarkably reinforced when the strain was added 24 hours before the complex (57,0 %). This, in comparison with the additions performed 15 minutes or 3 hours after the pathogens inoculation. The utilisation of the O strain at 108 ufc/ml has been combined with the utilisation o f 50um polybags. These latter allow the formation of a modified atmosphere during the length of the bunches transfer. The protection level was at 61,0% when both methods were combined whereas protection by the yeast alone was o f 41,0%. A strict correlation between the severity of the symptoms and the protection by the yeast has been highlighted. When the severity of the disease increases, protection by the yeast decreases.

Bibliographic Details

Main Author:	Lassois, Ludivine
Format:	thesis biblioteca
Language:	fre
Published:	FUSAGx
Subjects:	H20 - Maladies des plantes, Musa, maladie des plantes, pourriture, banane, Colletotrichum, Fusarium, Cephalosporium, pouvoir pathogène, levure, Pichia, Candida, maladie fongique, lutte biologique, symptome, http://aims.fao.org/aos/agrovoc/c_4993, http://aims.fao.org/aos/agrovoc/c_5962, http://aims.fao.org/aos/agrovoc/c_6667, http://aims.fao.org/aos/agrovoc/c_806, http://aims.fao.org/aos/agrovoc/c_1761, http://aims.fao.org/aos/agrovoc/c_3156, http://aims.fao.org/aos/agrovoc/c_1459, http://aims.fao.org/aos/agrovoc/c_5629, http://aims.fao.org/aos/agrovoc/c_8480, http://aims.fao.org/aos/agrovoc/c_16013, http://aims.fao.org/aos/agrovoc/c_1247, http://aims.fao.org/aos/agrovoc/c_11042, http://aims.fao.org/aos/agrovoc/c_918, http://aims.fao.org/aos/agrovoc/c_7566,
Online Access:	http://agritrop.cirad.fr/516209/ http://agritrop.cirad.fr/516209/1/LASSOIS-2003-lutte%20biologique%20maladie%20banane.pdf
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