References of "Tropicultura"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailPrincipal disease and Insect pests of Jatropha curcas L. in the lower valley of the Senegal river
Terren, Marieke ULg; Mignon, Jacques ULg; De Clerck, Caroline ULg et al

in Tropicultura (2012), 30(4), 222-229

Jatropha curcas L. seed oil is proven to be toxic to many microorganisms, insects and animals. Despite its toxicity, Jatropha is not pest and disease resistant. The following major pests and diseases ... [more ▼]

Jatropha curcas L. seed oil is proven to be toxic to many microorganisms, insects and animals. Despite its toxicity, Jatropha is not pest and disease resistant. The following major pests and diseases affecting Jatropha in the lower valley of the Senegal river have been identified: the leaf miner Stomphastis thraustica (Meyrick, 1908) (Lepidoptera, Gracillariidae), the leaf and stem miner Pempelia morosalis (Saalmuller, 1880) (Lepidoptera, Pyralidae) and the shield-backed bug Calidea panaethiopica (Kirkaldy, 1909) (Heteroptera, Scutelleridae), which can cause flower and fruit abortion. Damage from these pests was particularly great during the second year after the plantations were set up (2009) and before later receding. Nevertheless, the worst attacks were caused by a vascular disease transmitted through the soil, which killed 65% of the plants in four years. It is mainly characterised by collar and root rot, which causes foliage to yellow and wilt, before the plant eventually dies. These threats should increase if larger areas are planted with Jatropha. Considering the scale of the damage caused by these attacks in Bokhol, the development of an integrated pest management programme adapted to the local context should be considered. [less ▲]

Detailed reference viewed: 267 (24 ULg)
Full Text
Peer Reviewed
See detailAttempted cultivation of Jatropha curcas L. in the lower Senegal river valley: story of a failure
Terren, Marieke ULg; Saverys; Jacquet de Haveskercke, Paul et al

in Tropicultura (2012), 30(4), 204-208

With the objective of determining whether it would be possible to sustainably produce Jatropha curcas L. seeds on the marginal land situated close to the Senegal River, a 6-hectare pilot plantation was ... [more ▼]

With the objective of determining whether it would be possible to sustainably produce Jatropha curcas L. seeds on the marginal land situated close to the Senegal River, a 6-hectare pilot plantation was cultivated under drip irrigation between September 2007-November 2011, close to the village of Bokhol (Lat. 16°31’N, Long. 15°23’W). A series of tests were conducted on this plot, in order to identify the best cultivation methods for the area (date, density and method of planting, appropriate type of pruning, fertilisers to be applied, irrigation method, etc.). The average yields obtained at this site, after four years of cultivation (less than 500 kg.ha-1 of dry seed), using the best known production techniques, are significantly lower than anticipated, compared to the available figures for the irrigated cultivation of Jatropha in other parts of the world. The main causes of this failure are the plant’s limited useful vegetation period of six months per year, instead of twelve, and the scale of attacks by a soilborne vascular disease, which destroyed over 60% of the plantation within four years. [less ▲]

Detailed reference viewed: 63 (9 ULg)
Full Text
Peer Reviewed
See detailValue added and equity in the smallholder-produced teak (Tectona grandis L.f.) poles value chain in Southern Benin
Aoudji, Augustin; Adégbidi, A.; Akoha, V. et al

in Tropicultura (2012), 30(1), 55-60

Detailed reference viewed: 31 (5 ULg)
Full Text
Peer Reviewed
See detailInsecticidal effect of Jatropha curcas oil on the aphid Aphis fabae (Hemiptera: Aphididae) and on the main insect pests associated with cowpeas (Vigna unguiculata) in Niger
Abdoul Habou, Zakari; Haougui, A.; Mergeai, Guy ULg et al

in Tropicultura (2011), 29(4), 225-229

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as ... [more ▼]

The insecticidal activity of Jatropha curcas has been evaluated on various crop pests. Oil concentrations of 0.5, 1, 2.5, 5, 10 and 15% were first tested on the black bean aphid (Aphis fabae Scop.) as part of an efficacy test conducted in the laboratory. During a second stage, the insecticidal efficacy of 5 and 7.5% oil concentrations was evaluated on the main pests infesting cowpea crops (Vigna unguiculata L.) as part of a field test conducted at the University of Niamey (Niger). The results obtained in the two tests demonstrate the biocidal effect of the treatments applied, which increases with the concentration. On the black bean aphid, the biocidal effect increases during the hours following the application of oil before reaching a peak after 4 days. On cowpeas, J. curcas oil concentrations of 5% and 7.5% make it possible to reduce the level of attack by aphids (Aphis craccivora) by 10 and 50% respectively compared to the control. A 50% and 75% fall in the number of thrips (Megalurothrips sjöstedti) and bugs (Anoplocnemis curvipes), respectively, can be observed under the same conditions. This treatment made it possible to greatly increase yields compared to the untreated control. [less ▲]

Detailed reference viewed: 106 (6 ULg)
Full Text
Peer Reviewed
See detailAn alternative view of deforestation in Central Africa based on a Boserupian framework
Bamba, I.; Visser, M.; Bogaert, Jan ULg

in Tropicultura (2011), 29(4), 250-254

Detailed reference viewed: 27 (0 ULg)
Full Text
Peer Reviewed
See detailAnalyse du rôle de la biodiversité végétale des forêts de Kigwena et de Rumonge au Burundi
Hakizimana, P; Masharabu, T; Bangirimana, F et al

in Tropicultura (2011), 29(1), 28-38

Detailed reference viewed: 23 (4 ULg)
Full Text
Peer Reviewed
See detailAmélioration du taux de multiplication in vitro de Jatropha curcas L.
Medza Mve, Samson Daudet ULg; Mergeai, Guy ULg; Baudoin, Jean-Pierre ULg et al

in Tropicultura (2010), 28(4), 200-204

In order to improve the in vitro multiplication rate (number of shoots/explant/subculture) of Jatropha curcas L. axillary nodes taken from young plants of two accessions of this species (originating from ... [more ▼]

In order to improve the in vitro multiplication rate (number of shoots/explant/subculture) of Jatropha curcas L. axillary nodes taken from young plants of two accessions of this species (originating from Cameroon and Senegal) have been cultivated for three weeks on a MS medium supplemented with 8,87 µM BAP, 4.92 µM IBA, and 30 g.l-1 sucrose at pH 5.7±0.1, and solidified with 0.7% agar. The shoots obtained from each original explant were then transferred to proliferation media (PM) consisting of MS medium supplemented with 2.21 to 8.9 µM BA or 2.21 to 8.9 µM kinetin in combination with 2.46 µM IBA. Each combination was completed with 33.12 µM adenine sulfate, 82.92 µM of glutamine and 30 g.l-1 sucrose. The best multiplication rate was obtained for the PM medium containing 6.65 µM BA and 2.46 µM AIB. On this medium 42.72±3.22 and 38.15±4.7 shoots/explant were obtained respectively for the accessions from Cameroon and Senegal after 6 weeks of culture, and the mean multiplication rates were 8.27±1.27 (accession from Cameroon) and 7.89±1.13 (accession from Senegal) shoots per explant during the 7 following subcultures (3 weeks/subculture). This medium was also the one that allowed the best overall growth in shoot height. Leafy shoots obtained have been rooted in a medium containing half of the major mineral components of MS supplemented with 5.7 µM IBA, 1.5% sucrose and solidified with 0.7% agar, then acclimated with a survival rate of 97%. These results allow considering the establishment of industrial units of plantlet multiplication from elite clones of J. curcas. [less ▲]

Detailed reference viewed: 50 (18 ULg)
Full Text
Peer Reviewed
See detailEffets de la substitution du tourteau d’arachide par la fève de coton conventionnel en production de poulet de chair au Sénégal
Diaw, Mamadou Tandiang; Dieng, Abdoulaye; Mergeai, Guy ULg et al

in Tropicultura (2010), 28(3), 139-147

A study has been conducted on 400 chicks to evaluate conventional cottonseed kernels on broilers production. Groundnut cake has been substituted by cottonseed kernels at 0, 25, 50 and 75% levels ... [more ▼]

A study has been conducted on 400 chicks to evaluate conventional cottonseed kernels on broilers production. Groundnut cake has been substituted by cottonseed kernels at 0, 25, 50 and 75% levels. Cottonseed kernel incorporation decreased significantly (p< 0.001) the growing parameters, feed intake, feed efficiency and nutrients digestibility of the experimental diets. This reduction was proportional to the level of substitution. The study suggests that only the level of gossypol in cottonseed kernels limits their incorporation in broilers diets and that this by-product should be excluded from the formulation in broilers production or that its level of incorporation should be limited to a maximal level of 10% when production duration is not a constraint for breeders. [less ▲]

Detailed reference viewed: 97 (7 ULg)
Full Text
Peer Reviewed
See detailDésertification des parcours arides au Maroc
Mahyou, Hamid ULg; Tychon, Bernard ULg; Balaghi, Riad et al

in Tropicultura (2010), 28(2), 107-114

Rangeland or natural arid pastures of Morocco are ecosystems where there is a natural or seminatural vegetation composed of steppes, shrubs and grassland. They cover about 82% of the Moroccan arid lands ... [more ▼]

Rangeland or natural arid pastures of Morocco are ecosystems where there is a natural or seminatural vegetation composed of steppes, shrubs and grassland. They cover about 82% of the Moroccan arid lands. These areas represent livelihoods for thousands of people and protect the country from desertification. Despite the importance of the rangelands and the threat of desertification, it is surprising that up to date there is no comprehensive assessment of their condition and their evolution, hindering any plan for desertification alleviation. However, the available information on selected pilot areas shows that these rangelands are threatened by desertification. It’s associated with biodiversity loss and contributes to climate change. The leading causes of land degradation are the human actions combined with climate. The establishment of a comprehensive surveillance system based on remote sensing, biophysics and socio-economic data must be envisaged to provide policymakers with an operational tool adapted to the spatio-temporal monitoring of desertification. [less ▲]

Detailed reference viewed: 171 (18 ULg)
Full Text
Peer Reviewed
See detailDetermination of a Suitable Protocol for Indigenous Oilseed Cucurbits Plant Regeneration
Gnamien, Yah Gwladys; Zoro Bi, I. A.; Djè, Y. et al

in Tropicultura (2010), 28(4), 217-225

The present work was carried out to establish rapid in vitro propagation of the indigenous oilseed Citrullus lanatus. Efficiency of 3 protocols for seed decontamination was investigated. High level of ... [more ▼]

The present work was carried out to establish rapid in vitro propagation of the indigenous oilseed Citrullus lanatus. Efficiency of 3 protocols for seed decontamination was investigated. High level of seed sterilization was obtained after removing seed coat and soaking the seeds in 1.6 % sodium hypochlorite with a drop of Tween 20. Shoot tips, single node and cotyledon explants of 3 morphotypes have been screened for adventitious shoot formation in tissue culture. Best response in termis of multiple shoot induction was obtained from cotyledon proximal part with hypocotyl segmenet on Murashige and Skoog medium supplemented with 1 mg/l 6-Benzylaminopurine, 30 g/l sucrose and 8 g/l agar. After 3 weeks of culture, 90% of cotyledon proximal parts induced shoot. An average of 12.6 shoots per explants and a mean shoot length of 8 mm were obtained after multiplication stage. Shoot induction appeared to be strongly influenced by genotype and explant type. The percentage of shoot induction from cotyledon proximal parts ranged from 23.3% to 64.0% according to the genotype. Efficient rooting was achieved on half-solid MS medium containing 0.1 mg/l 1-Naphthaleneactic acid or without growth regulator. Acclimatised plantlets were transferred to greenhouse where they grew and flowered like seeded plantlets. [less ▲]

Detailed reference viewed: 37 (3 ULg)
Full Text
Peer Reviewed
See detailEvaluation de l'impact économique du cotonnier sans gossypol en Côte d'Ivoire.
Zagbai, H. S.; Berti, Fabio ULg; Lebailly, Philippe ULg

in Tropicultura (2008), 26(1), 28-31

Detailed reference viewed: 21 (6 ULg)
Full Text
Peer Reviewed
See detailEnvahissement des cuvettes par apports éoliens: processus, impacts et moyens de lutte
Ambouta, Karimou J-M; Tychon, Bernard ULg

in Tropicultura (2008), 26

Detailed reference viewed: 20 (1 ULg)
Full Text
Peer Reviewed
See detailPossible Contributions of Jatropha curcas L. to Rural Poverty Alleviation in Senegal: Vision and Facts
Saverys, S.; Toussaint, André ULg; Defrise, L. et al

in Tropicultura (2008), 26(2), 125-126

Detailed reference viewed: 12 (7 ULg)
Full Text
Peer Reviewed
See detailLes enjeux socio-économiques autour de l’agroforesterie villageoise à Aguié (Niger)
Dramé Yayé, A.; Berti, Fabio ULg

in Tropicultura (2008), 26(3), 141-149

Detailed reference viewed: 55 (2 ULg)
Full Text
Peer Reviewed
See detailPossible Contributions of Jatropha curcas L. to Rural Poverty Alleviation in Senegal : Vision and facts
Savery, S.; Toussaint, André; Defrise, L. et al

in Tropicultura (2008), 26(2), 125-126

Detailed reference viewed: 29 (5 ULg)
Full Text
Peer Reviewed
See detailGestion participative du sanctuaire de gorilles de plaine de l’Ouest (Gorilla gorilla gorilla) de Lossi en République du Congo-
Mbete, Roger A.; Banga Mboko, Henri; Njikam Nsangou, Ibrahim ULg et al

in Tropicultura (2007), 25(1), 44-50

The gorilla sanctuary of Lossi experiments the synergy between scientific research and nature conservation. Three partners are involved in a management participative process. These partners include the ... [more ▼]

The gorilla sanctuary of Lossi experiments the synergy between scientific research and nature conservation. Three partners are involved in a management participative process. These partners include the Republic of Congo, the local community of Lossi and the European programme on the forest ecosystems in Central Africa. An investigation was carried out on the sanctuary of Lossi in 2003, in order to study in situ the effects generated by the participative management and to identify the constraints linked to the participative approach. The work of primatologists allowed the habituation of the gorillas to the human presence and opened eyesight tourism of western lowland gorillas. A camp for tourists and the access road to the sanctuary have been constructed. The tourism generated jobs in favour of the local population which is also a take-partner of contracts on road repairing. The income from the tourism allowed the construction of a health centre. However, the works of researchers and tourism activities failed during the outbreaks of the Ebola hemorrhagic fever and during the three civil war episodes. The consolidation and the long term of this process of co-management of natural resources of Lossi remains the establishment of a management that should include conservation, rural development and scientific research, with equitably in the distribution of gain between the partnerses. [less ▲]

Detailed reference viewed: 45 (6 ULg)
Full Text
Peer Reviewed
See detailDevelopment of a radioimmunoassay for bovine chymosin B
Idrissa-Sidikou, Djibo; Remy, Benoit; Dufrasne, Isabelle ULg et al

in Tropicultura (2007), 25(3), 134-139

The present study was conducted to develop and validate a specific radioimmunoassay system for measurement of bovine chymosin B (bChyB) concentrations in plasma samples. Bovine ChyB was used for ... [more ▼]

The present study was conducted to develop and validate a specific radioimmunoassay system for measurement of bovine chymosin B (bChyB) concentrations in plasma samples. Bovine ChyB was used for immunization of rabbits and as standard and tracer. Chymosin B concentrations were measured in plasma samples from two groups of calves (Group 1: calves sampled from birth to 24 hours; Group 2: calves sampled from Day 1 to 21 after birth) and from one cow during the peri-partum period. Detection limit of the assay was 9.0 ng/mL. Recovery was higher than 89.3%. Repeatability and reproducibility ranged from 1.52% to 5.23% and from 1.52% to 12.57% respectively. No cross-reaction was found with pepsinogen A from bovine, porcine or human origins. In Group 1, bChyB concentrations increased from 47.3±45.1 ng/mL (5 min after birth) to 325.5±161.2 ng/mL (12 hours after birth), then it decreased till 293.0±161.5 ng/mL (24 hours after birth). In Group 2, concentrations decreased from Day 1 (455.3±191.1 ng/mL) to Day 21 (117.9±85.1 ng/mL). In adult cow, mean concentration was 136.0±32.3 ng/mL. In conclusion, bChyB is able to cross the stomach basal membrane and to reach the blood circulation at detectable levels in both young calves and adult cows. [less ▲]

Detailed reference viewed: 62 (5 ULg)
Full Text
Peer Reviewed
See detailDynamique de la filière viande de brousse dans la partie continentale du Rio Muni en Guinée équatoriale
Njikam Nsangou, Ibrahim ULg

in Tropicultura (2004), 22(4), 204-210

The aim of this study was to do surveys about bush meat networks around urban centers near the Monte Alen National Park in Equatorial Guinea. During 8 weeks, in the Mundoasi market, one of two principal ... [more ▼]

The aim of this study was to do surveys about bush meat networks around urban centers near the Monte Alen National Park in Equatorial Guinea. During 8 weeks, in the Mundoasi market, one of two principal market of Bata, 4328 wild animal carcases have been indexed, representating 22,600 kg of biomass. A total of 48 animals species have been identified, including 14 which hunting are prohibited. The mammals represent 91.87% of total number with 3 dominants orders, ungulates (37.7%), primates (28.6%) and rodents (18%). The duiker (Cephalophus), the African Brushtailed Porcupine and Guenon are the most important. The district of Niefang, Bata and Evinayong are the principal sources of supply. Hunting with gun becomes very important, follow by snaring, a very wasteful method. Despite that this business squarely growth, signs of wildlife decrease are perceptible, showing evidence of overexploitation. As far as Monte Alen National Park is concerned, this study shows the positive effects of this protected area as wildlife reservoir for peripheral hunting zones. [less ▲]

Detailed reference viewed: 27 (7 ULg)