35 research outputs found

    Bananas and food security= Les productions bananieres: un enjeu economique majeur pour la securite alimentaire: International symposium, Douala, Cameroon, 10-14 November 1998

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    The proceedings of the first International Symposium on the socioeconomics of non-export banana production 'Bananas and food security' held in November 1998 in Douala, Cameroon, include 61 contributions from all over the world and cover the following topics: Importance of bananas economically and as a source of food (16 contributions); Diversity and dynamics of the sectors (18 contributions); Organisation of markets and marketing (13 contributions) and Production systems (14 contributions). Papers are published in their original language (English or French) and include abstracts in both languages. These proceedings will provide a valuable tool for sharing the wide range of experiences and information presented during the symposium and will promote increased activity in the area of socioeconomics

    Sigatoka leaf spot diseases: Black leaf streak disease (black Sigatoka); Sigatoka disease (yellow Sigatoka)

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    Musa disease fact sheet on Sigatoka leaf spot diseases (black and yellow). The black leaf streak disease caused by Mycosphaerella fijiensis and the Sigatoka disease caused by Mycosphaerella musicola. This double sheet provides updated information on the distribution of the two diseases and reviews the most recent research information and requirements: symptoms, control measures and breeding for resistance

    The acute effects of plyometric and sled towing stimuli with and without caffeine ingestion on vertical jump performance in professional soccer players

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    Abstract Background Post-activation potentiation (PAP) is the phenomenon by which muscular performance is enhanced in response to a conditioning stimulus. PAP has typically been evidenced via improved counter movement jump (CMJ) performance. This study examined the effects of PAP, with and without prior caffeine ingestion, on CMJ performance. Methods Twelve male professional soccer players (23 ± 5 years) performed two trials of plyometric exercises and sled towing 60 min after placebo or caffeine ingestion (5 mg.kg− 1) in a randomized, counterbalanced and double-blinded design. CMJ performance was assessed at baseline and 1, 3 and 5 min after the conditioning stimulus (T1, T3 and T5, respectively). Results Two way ANOVA main effects indicated a significant difference in jump height after the PAP protocol (F[3, 11] = 14.99, P  0.05) compared to placebo. Conclusions The results of this study suggest that acute plyometric and sled towing stimuli enhances jump performance and that this potentiation is augmented by caffeine ingestion in male soccer players

    Modélisation en protection des cultures

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    La cercosporiose des agrumes provoquĂ©e par #Phaeoramularia angolensis$ (de Carvalho & O. Mendes) P.M. Kirk, occasionne de sĂ©rieux dĂ©gĂąts sur feuilles et fruits au Cameroun. Une Ă©tude de l'Ă©volution de la maladie en champ a Ă©tĂ© rĂ©alisĂ©e Ă  Nkolbisson (zone forestiĂšre humide) entre octobre 1989 et octobre 1991. L'observation de sept sĂ©ries de fruits Ă  diffĂ©rentes saisons a permis de constater que : les chutes de fruits malades sont prĂ©coces et nombreuses en seconde campagne (floraison de septembre Ă  dĂ©cembre), mais plus tardives et peu nombreuses en premiĂšre campagne (mars-juin); les proportions de fruits tachĂ©s sont Ă©levĂ©es mĂȘme sur variĂ©tĂ©s rĂ©putĂ©es peu sensibles Ă  la cercosporiose pendant toutes les campagnes (81 % sur Satsuma St Jean, 61 % sur citronnier Eureka dans la floraison de mars 1991); les fruits demeurent sensibles durant tout leur dĂ©veloppement, c'est ce que traduit l'augmentation continue du nombre moyen de lĂ©sions par fruit ainsi que des proportions de fruits tachĂ©s; l'accroissement du diamĂštre moyen des fruits est faible en seconde campagne (septembre - dĂ©cembre) suite aux attaques prĂ©coces et intenses; une fructification dĂ©clenchĂ©e par des arrosages en saison sĂšche (fĂ©vrier 1990) n'a Ă©tĂ© attaquĂ©e que tardivement aprĂšs le retour des pluies. Les rĂ©sultats sont prĂ©sentĂ©s pour 3 sĂ©ries de fruits sur 7 (une de premiĂšre, une de deuxiĂšme campagne ainsi que celle correspondant Ă  la floraison dĂ©calĂ©e). (RĂ©sumĂ© d'auteur
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