Cinétique de l'infection de plants d'Heveabrasiliensis (Willd. ex Adr. de Juss) Mull. Arg. par Rigidoporuslignosus (Kl.) Imazeki

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Abstract
Using an artificial inoculation technique, a kinetic infection study of H. brasiliensis (Willd. ex Adr. de Juss) Mull. Arg. by R. lignosus (Kl.) Imazeki showed the existence of a 3-stage infection process: one being (i) a particularly fast contamination stage. After 15 days of exposure, all plants showed rhizomorphs to be present on taproots; (ii) the spread of epiphytic mycelium all over taproots is associated with numerous punctual penetrations allowing tissue invasion and infection. Beginning at the apex, a rot develops and progresses upward; in < 3 mo., it affects nearly 40% of the invaded plants'' taproot. In response to this, the host develops reaction mechanisms which become evident at the cellular level and on the entire plant; and (iii) at this time, a state of equilibrium is reached between the host and the parasite which is shown through a stagnant disease progress. The efficiency of the various host reactions observed in the plants is discussed.

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