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European Journal of Plant Pathology

, Volume 108, Issue 9, pp 893–902 | Cite as

Biological and Physical Constraints on Maize Production in the Humid Forest and Western Highlands of Cameroon

  • Z. Ngoko
  • K.F. CardwellEmail author
  • W.F.O. Marasas
  • M.J. Wingfield
  • R. Ndemah
  • F. Schulthess
Article

Abstract

The aim was to identify biological and physical factors responsible for reducing maize yield in Cameroon. Two surveys were conducted in 137 fields in two agroecological zones in 1995–1997. In the Humid Forest (HF), Bipolaris maydis, Stenocarpella macrospora, Puccinia polysora, Rhizoctonia solani and soil fertility were factors that reduced maize production in 1995 and 1996. In the Western Highlands (WHL), Cercospora zeae-maydis, and the interaction between soil fertility and maize variety were the most important constraints to maize production in 1996. In 1997, C. zeae-maydis, S. macrospora, physiological spot and stem borer damage (Busseola fusca) were negatively related to ear weight. The combination of these biological factors (diseases and insects), and the physical parameter of soil fertility were responsible for reducing maize yield in these selected benchmarks of Cameroon. Maximum potential yield reductions were estimated at 68% due to B. maydis and 46% due to S. macrospora, respectively, in the HF in 1995. In 1996, maximum potential yield reductions in the HF were estimated at 34%, 41% and 30% due to S. macrospora, P. polysora and R. solani, respectively. In the WHL, C. zeae-maydis had the potential to cause a yield reduction of 79% in 1996. In the WHL in 1997, the interaction between C. zeae-maydis and B. fusca, stem diseases and the physiological spot caused potential reductions of 52%, 34% and 39%, respectively.

Cameroon field pathogens maize regression analysis yield loss 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Z. Ngoko
    • 1
  • K.F. Cardwell
    • 2
    Email author
  • W.F.O. Marasas
    • 3
  • M.J. Wingfield
    • 4
  • R. Ndemah
    • 5
  • F. Schulthess
    • 2
  1. 1.IRAD BambuiBamendaCameroon
  2. 2.International Institute of Tropical Agriculture (IITA)Biological Control Center for AfricaCotonou, 08Republic of Benin
  3. 3.Programme on Mycotoxins and Experimental Carcinogenesis (PROMEC)Medical Research CouncilTygerbergSouth Africa
  4. 4.Forestry and Agricultural Biotechnology Institute (FABI), Faculty of Biological and Agricultural SciencesUniversity of PretoriaPretoriaSouth Africa
  5. 5.IRADMessa, YaoundeCameroon

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