Water relations of Alternaria alternata, Cladosporium cladosporioides, Cladosporium sphaerospermum, Curvularia lunata and Curvularia pallescens

The effects of water activity (aw) on the growth rates of two isolates of Alternaria alternata and a single isolate each of Cladosporium cladosporioides, Clad. sphaerospermum, Curvularia lunata and Curv. pallescens were examined at 25 °C. The aw of the growth media was controlled by glucose/fructose. The minimum aw for germination of A. alternata, Curvularia lunata and Curv. pallescens was 0·855. Cladosporium cladosporioides and Clad. sphaerospermum germinated at a minimum aw of 0·815. Clad. sphaerospermum also grew at this aw, but germinating conidia of Clad. cladosporioides did not produce microcolonies.

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