Elsevier

Crop Protection

Volume 17, Issue 5, July 1998, Pages 427-439
Crop Protection

Research paper
Occurrence and distribution of Peronosclerospora sorghi [Weston and Uppal (Shaw)] in selected countries of West and Southern Africa

https://doi.org/10.1016/S0261-2194(98)00037-4Get rights and content

Abstract

Surveys of sorghum and maize crops were undertaken in Nigeria, Zimbabwe, Zambia, Mozambique and Rwanda during 1991 and 1992. The occurrence and prevalence of sorghum downy mildew (SDM) caused by Peronosclerospora sorghi [(Weston and Uppal) Shaw] was assessed in regions of each country. In Nigeria only maize was systemically infected in the southern humid zone, where rainfall was 1200–1800 mm and the altitude 300–1000 m. This epidemic zone appeared to be geographically isolated from other areas of Nigeria where SDM was observed. Within the southern epidemic zone, yield loss was estimated to be 11.7%. Individual fields had up to 95% incidence of systemically infected plants. In the arid north of Nigeria (rainfall < 1300 mm, altitude 600–1200 m) both maize and sorghum were infected, and disease incidence was invariably low (<5%). Systemic SDM incidence on maize was negatively correlated with growth stage (r = −0.7746, P = 0.01). In Zimbabwe, Zambia, Mozambique and Rwanda sorghum and maize were infected with SDM in areas with an annual rainfall of 600–1200 mm and an altitude range of <300–1800 m. Incidence of infection within crops was generally low, and sites with infected crops were scattered in these countries. SDM local lesion infection was observed only on sorghum. Yield loss due to SDM in Zambia, Zimbabwe and Rwanda at the time of the survey was negligible. However, SDM is widespread in Africa and occurs in many different agricultural areas, and thus remains a threat to sorghum and maize production. Management of the disease using resistant varieties, cultural and chemical control should reduce the risk of future epidemics.

References (37)

  • V. Adenele et al.

    Downy mildew diseases of maize in Nigeria

  • A.B. Anaso

    Survival of downy mildew pathogen of maize in Nigerian guinea savanna

    Applied Agricultural Research

    (1989)
  • A.B. Anaso et al.

    Identity of a downy mildew in maize in Nigerian guinea savanna

    Samaru Journal of Agricultural Research

    (1987)
  • A.B. Anaso et al.

    Assessment of loss in yield due to sorghum downy mildew (Peronosclerospora sorghi) of maize in Nigerian guinea savanna

    Tropical Pest Management

    (1989)
  • R.A. Bandyopadhyay
  • C.H. Bock et al.

    Host range of sorghum downy mildew in Africa

    International Sorghum and Millets Newsletter

    (1995)
  • C.H. Bock et al.

    Production of conidia of Peronosclerospora sorghi on sorghum in Zimbabwe

    Plant Pathology

    (1998)
  • M.R. Bonde et al.

    Host range of an American isolate of Peronosclerospora sorghi

    Plant Disease Reporter

    (1979)
  • K.F. Cardwell

    Eradication strategy for maize downy mildew

  • Y. Cohen et al.

    The role of airborne conidia in epiphytotics of Sclerospora sorghi on sweet corn

    Phytopathology

    (1977)
  • W.A.J. de Milliano

    Sorghum diseases in southern Africa

  • H. Doggett

    Downy mildew in East Africa

    Indian Phytopathology

    (1970)
  • H. Doggett
  • J. Fajemisin

    Downy mildew of maize in Nigeria

  • R.A. Frederiksen

    Sorghum downy mildew in the United States: overview and outlook

    Plant Disease

    (1980)
  • R.A. Frederiksen

    Seed transmission of Peronosclerospora sorghi in grain sorghum: how can it be avoided

  • R.A. Frederiksen et al.

    Distribution symptoms and economic loss from downy mildew caused by Sclerospora sorghi in grain sorghum in Texas

    Plant Disease Reporter

    (1969)
  • R.G. Kenneth

    The downy mildews of corn and other gramineae in Africa and Israel and the present state of knowledge and research

    Kasetsart Journal

    (1976)
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