Abstract
A survey of farmers' fields in the Savanna zone of Nigeria in 1999 indicated the presence of stalk and cob rots of maize at incidence rates of 15 – 43% and disease severity of 2.0 – 6.7. The causal organism was identified as Stenocarpella maydis ( = Diplodia maydis). S. maydis was found to reduce seed germination by up to 29.2%. Laboratory and screen house experiments were used to evaluate the efficacy of six seed treatment fungicides indicated that Luxan (a local fungicide of unknown composition), benomyl (Benlate) and mancozeb (Dithane M-45) were more effective than metalaxyl + carboxin + furathiocarp (Apron-plus), carbendazin + maneb (Delsene M) and tetramethylthiuram disulphide + hexachlorobenzene (thiram + HCB) in controlling S. maydis. Stalk rot severity increased with increasing fertilization rates.
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