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Annals of Botany 78: 653-657, 1996
© 1996 Annals of Botany Company

Production of Microconidia by Cercospora henningsii Allesch, Cause of Brown Leaf Spot of Cassava (Manihot esculenta Crantz) and Tree Cassava (Manihot glaziovii Muell.-Arg.)

E. N. AYESU-OFFEI and C. ANTWI-BOASIAKO

Department of Biological Sciences, University of Science and Technology, Kumasi, Ghana

June 28, 1995 ; May 31, 1996

Sporulation ofCercospora henningsii Allesch has been examined under various relative humidities, and in the presence of free water in lesions on leaves of cassava and tree cassava. Mature conidia of the fungus on both cassava and tree cassava do not germinate in lesions but accumulate, and under the optimum conditions of 25–32 °C and in the presence of free water, they bud and fragment into numerous microconidia. Microconidia are cylindrical, mostly one-celled, and measure 7.5–17.5x3.7–7.5 µm. Production of microconidia significantly decreases as relative humidity decreases. Microconidia readily germinate by means of a germ tube at 100% relative humidity on both surfaces of host leaf and on glass slides. Some germ tubes form appressoria and symptoms appear on cassava leaves inoculated with microconidia. The results are discussed in relation to possible modes of dispersal of the spores and control of the disease.

Free water; sporulation; budding; microconidia


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