Two simple formulations of an antagonistic strain of Trichoderma koningii were employed against southern blight disease caused by Sclerotium rolfsii in seedling, potted outdoor and field‐grown tomatoes (cvs. Ife No. 1 and Ibadan Local). Corn cob germling inoculum and mycelium powder of T. koningii significantly controlled ( P ≤0·05) symptoms of damping off, blight and wilting in both tomato cultivars. The populations of the antagonist increased from an initial 1 × 10 4 to about 1 × 10 6 colony‐forming units per g of soil in the protected plants. Moreover, sclerotial counts decreased significantly ( P ≤0·05) in these soils and those sclerotia found had been parasitized by T. koningii. Trichoderma ‐protected plants were more vigorous than those in the other treatment categories. The significance of these results is discussed in relation to the use of Trichoderma in appropriately simplified formulations.
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A. O. Latunde‐Dada (1993) studied this question.
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