Grey leaf spot (GLS) of maize is caused by the fungus Cercospora zeae-maydis. The disease
is now recognised as one of the most significant yield-limiting diseases of maize worldwide
and certainly in the province of KwaZulu-Natal (see Table 1). Not only is it a threat to maize
production in the commercial farming sector, it also reduces yields of maize on small-scale
farms. The disease was first identified in KwaZulu-Natal in 1989/90 and has since spread to
neighbouring provinces and most maize producing countries in Africa.
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