Abstract
In greenhouse and controlled-environment tests, disease development on round-leaved mallow (Malva pusilla) and velvetleaf (Abutilon theophrasti) of Colletotrichum gloeosporioides f. sp. malvae was affected by inoculum concentration and plant growth stage at time of inoculation, postinoculation air temperature, and dew-period duration and temperature. The highest levels of control were obtained with an inoculum concentration of 210 6 spores per milliliter for M. pusilla and 4×10 6 spores per milliliter for A. theophrasti. All growth stages were susceptible, although younger seedlings were less susceptible than older plants. Postinoculation air temperatures of 30 C for M. putilla and >15 C for A. theophrasti reduced disease development significantly [...]
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