Session 1

• P. Seneviratne and A. Nugawela, Use of young buddings as a planting material.
  
• A.S. Devakumar, Jacob James and M.R . Sethuraj, A novel approach to obtain increased growth in nursery seedlings of Hevea brasiliensis using CO2 fertilization.
  
• G.A. Sagay and K.O. Omokhafe, Evaluation of rootstock and scion compatibility in Hevea brasiliensis.
  
• N.E.M. Jayasekera, K. B. Karunasekera and S. Herath, Genetic control of growth (girthing) and its response to tapping in Hevea brasiliensis.
  
• Garanad Jarin and Sinthurahat Somyot, Optimum planting density for rubber production in Thailand.

Session 2

• Lalani Samarappuli, S. Dharmakeerthi, A.M.A. Perera, R. Hettiarachchi, P.Karunadasa and U. Mitrasena, Possibilities of growing rubber in marginal dry areas.
  
• H. Omont, J.M. Eschbach, Tran-Van Canh, G.B. Dea and Z.J. Keli, Rubber tree (Hevea brasiliensis) behaviour in marginal agroclimatic zones of Côte d'Ivoire: assessment of 10 years of observations.
  
• D.M.A.P. Dissanayaka, T. Dissanayaka and C. Maheepala, Sri Lankan rock phosphate: a useful source of phosphorus for rubber.
  
• H. Zainab and S. Sivakumaran, Nutrient status in relation to tree dryness; K.G. Karnika de Silva, M.G.T.R. Kariyawasam,
  
• D.M.S. Medhavi Wijesekara and Indra Denawaka, Controlled release of nutrients from fertilizers through membranes based on natural rubber and coir dust.
  

Session 3

• A. Nugawela, K.A.G.B. Amaratunga, S. Wilbert and R.P. Karunasena, Response of clone PB 86 to low frequency tapping under smallholder management conditions;
  
• Kwei Chong and S. Sivakumaran, Periodic tapping system as an effective approach for sustained yield responses on young mature rubber;
  
• Faiz Ahmad, Efficacy of herbicides and herbicide mixtures on weeds under rubber.
  

Session 4

• C.K. Jayasinghe, W.P.K. Silva, D.S. Wettasinghe, J.L.P.C. Wettasinghe and T.H.P.S. Fernando, A decade of experience with Corynespora leaf fall (CLF) disease in Sri Lanka;
  
• R. Jayaratne, Beneficial effects of vesicular arbuscular (VA) mycorrhizal associations;
  
• K.E. Jayasuriya, Use of potentially antagonistic fungi to control some Hevea pathogens in vitro;
  
• T. Warnakula, P.J.B. Bliss, L.M.K. Tillekeratne, N. Aslibalt and S. Kudaligama, A new medium for biological waste water treatment.
  

Proceedings of an IRRDB Symposium on Farming Systems for Hevea held at Beruwela, Sri Lanka. (Cost £50)

Session 1

• J. Nguema, W. Ziebell and F. Enjalric, Rubber and associated food crops in a Central African country;
  
• A.M. C. Kouadio, J.Z. Keli and B.D. Goue, Food crops associated with Hevea in Côte d'Ivoire: resulting effect on production;
  
• M.J. Rosyid, G. Wibawa and A. Gunawan, Development of smallholder rubber through improvement of integrated rubber-based farming systems in Indonesia;
  
• G. Wibawa, W. Thomas, M.J. Rosyid, D. Tambunan and A. Gunawan, Study of the component interactions in Hevea-based intercropping systems;
  
• L.S.S. Pathiratna and M.K.P. Perera, Performance of cinammon and forage grass plus tree legume mixture under rubber (Hevea).
  

Session 2

• J.Z. Keli, G. Dea, C. Kouadio, S. Obouayeba and H. Omont, Cropping systems in Côte d'Ivoire associating rubber, annual crops and perennial crops: evaluation of 20 years of experimentation;
  
• E. Penot, Complex rubber agroforestry systems in Indonesia: an alternative to low productivity of jungle rubber conserving agroforestry practices and benefits;
  
• M.D. Jessy, Philip Varghese, K.Prathapan, K.I. Punnoose and M.R. Sethuraj, Multispecies cropping system with rubber: a preliminary report;
  
• Wasana Wijesuriya, R.O. Thattil, N. Yogaratnamand S.M.M. Iqbal, Analysis of intercropping systems under rubber;
  
• J.M. Eschbach, European Union Research Projects: Hevea-based farming systems.
  

Session 3

• Lin Weifu and Chen Qiubo, Mixed farming in China's rubber plantations;
  
• Lai Van Lam, Thanh Tinh Pham and Thi Dung Pham, Intercropping with Hevea in Vietnam;
  
• I.N. Samarappuli, A. Eyanayake and A. Naranpanawa, Natural rubber industry in transition;
  
• P.M.H.U. Herath, Some factors affecting replanting of smallholder rubber in Sri Lanka;
  
• C. Anwar, H. Suryaningtyas and C. Conroy, A survey of smallholder rubber farmers in South Sumatra, Indonesia;
  
• Tran van Canh, G.B. Dea, S. Obouayeba and Z.J. Keli, Research training in the smallholder rubber (Hevea) sector in Côte d'Ivoire;
  

Proceedings of an IRRDB Symposium on natural rubber technology and end uses held at Beruwela, Sri Lanka. (Cost £50)

Session 1

• H. Livonniere, Natural rubber consistency - current knowledge and trends;
  
• S. Sylla, Achi A. Koman, Don A. Allet and J.C. Laigneau, Assessment of clonal typology in natural rubber molecular sizing;
  
• D.P.S.T.G. Attanayaka, R.G.O. Kekwick, S. Herath and F.C.H. Franklin, Expression of rubber elongation factor (REF) protein (a potential allergen from natural rubber goods) in E. coli.
  

Session 2

• K.P. Jones, Substitution of natural rubber by synthetic rubber and vice versa;
  
• N.M.V. Kalyani Liyanage, L. Karunanayake and P.H. Sarath Kumara, Evaluation of the performance of some antioxidant/antioxidant systems in radiation prevulcanized natural rubber latex;
  
• S.A. Pushpa P. Goonetilleke, Champa Wellappili, Chitra Kuruppu and L.P. Witharana, Preparation and characterization of Epoxidized Natural Rubber from low nitrogen latex;
  
• Chen Ying, Preparation and properties of Epoxidized Natural Rubber latex;
  
• Alex Rosamma, Kuriakose Baby and W.C.M. Kurupu, Studies on factors affecting initial plasticity of natural rubber and their influence on processing and vulcanizate properties;
  
• N.M.V. Kalyani Liyanage and U. Wijesinghe, Thickening of natural rubber latex by zinc/ammine system.
  

Session 3

• C.S.L. Baker, 500 years of natural rubber;
  
• J. Sainte-Beuve, Drying of crumb natural rubber: latest results; Nguyen Thanh Nguyen, Production and quality consistency of Standard Vietnamese Rubber (SVR);
  
• W.M.G. Seneviratne, Cost effective rubber effluent treatment;
  
• T. Warnakula, S. Kudaligama, D. Ramawickrema and P.D.J. Rodrigo, Attempt to reduce the concentrated waste volume from crepe rubber factories without affecting the quality of rubber;
  
• A.I. Aigbodion and F.E. Okieimen, Estimation of dilute solution viscosity parameters of rubber seed alkyds;
  
• Nucharat Na-Ranong and V. Kajornchaiyakul, Using modified silicas in the rubber industry;
  
• S. Siriwardena, Investigation of alternative energy resources for drying of natural rubber in Sri Lanka.
  

IRRDB Information Quarterly

Part 1

• Reducing SALB risks cultivating rubber in "Escape Areas";
  
• In vitro culture by temporary immersion;
  
• Natural rubber in Cambodia;
  
• Chemical control of "Chinese Taxillus" ;
  
• The IRRDB's first Rothamsted International Fellow;
  
• Report on the TPD field experiment conducted by the Chinese Academy of Tropical Agricultural Science .
  

Part 2

• IRSG in Thailand;
  
• Latex protein allergy;
  
• White Root disease;
  
• Developments with natural rubber.
  

Part 3

• Rubber trends and outlook (EIU).
  
• Outlook for natural rubber to the year 2000.
  
• The Internet.
  
• CIRAD confirms its strategies.
  
• Can there be a green recycling policy?.
  
• Environmental auditing.
  
• Phytophthora diagnosis.
  

Part 4

• EPDM: a significant competitor;
  
• Rubber industry in Russia and Eastern Europe;
  
• INRA III: status, prospects and future buffer stock operations;
  
• Characterization of natural rubber from different producers;
  
• Effects of water storage on seed germination and seedling growth of rubber (Hevea brasiliensis Muell Arg.);
  
• Phytophthora diagnosis;
  
• Control of white root disease (Fomes) on Hevea.