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Les technologies de recolte du latex de l’hevea peuvent etre ajustees selon le clone et la disponibilite de la main-d’oeuvre saigneur. Cette etude vise a determiner une technologie adaptee a la saignee descendante du clone PB 235 d’hevea en conditions de faibles regimes de stimulation hormonale. Les heveas ont ete plantes selon un dispositif en blocs completement randomises. La frequence de saignees d3, avec deux stimulations, et celles en d4 et d6, avec quatre stimulations ont ete comparees. Les resultats ont montre que la frequence de saignees d4 a favorise une production de caoutchouc importante et un taux d’encoche seche plus faible par rapport au temoin d3. Les saignees en d4 et d6 permettent de reduire le besoin en main-d’oeuvre saigneur respectivement de 25% et 50% et d’allonger la duree de saignee sur panneau bas de trois et huit ans. La d6 a enregistre une production de caoutchouc moins elevee avec un taux d’encoche seche identique a celui de la d4. La saignee descendante en d4, plus productive, permet en outre une preservation de l’etat physiologique des heveas et, est donc plus adaptee au clone PB 235. La d6 ne peut etre pratiquee qu’en situation de manque de saigneurs. © 2017 International Formulae Group. All rights reserved. Mots cles: Caoutchouc, latex, production, recolte, saigneur, technologie English Title: Effect of latex harvesting technologies d3, d4 and d6 at lower hormonal stimulation on downward tapping of rubber tree clone PB 235 in Cote d'Ivoire English Abstract Latex harvesting technologies of rubber tree can be adjusted according to clone and availability of tapping manpower. This study aims at determining a technology adapted to the downward tapping of clone PB  235 in case of lower frequencies of hormonal stimulation. Rubber trees were planted according to completely randomized blocks. Tapping frequency in d3, with two stimulations, was compared with tapping in d4 and d6 both with 4 stimulations. The results showed that tapping at d4 frequency supported significant rubber production and lower rate of panel dryness compared with d3. Tapping frequencies at d4 and d6 allow reduction of the need for tapping manpower by 25% and 50% and stretch the tapping time on downward panel of three and eight years with respect to d3. The d6 recorded a lower rubber production with an identical rate of panel dryness of that of d4. Downward tapping at d4 frequency, more productive, allows besides preservation of physiological state of rubber trees and is thus more adapted to clone PB 235. The d6 is only appropriate in case of lack of tappers. © 2017 International Formulae Group. All rights reserved. Keywords: Rubber, latex, production, harvest, tapper, technology

international journal of biological and chemical sciences

Incidence des fréquences de saignées d3, d4 et d6, à faibles régimes de stimulation hormonale, sur le panneau descendant du clone PB 235 d’hévéa en Côte d’Ivoire