Abstract
In colonies ranging from 3‐ to 5‐days‐old, light in general stimulates conidiation in Verticillium, including V. agaricinum and several strains of V. albo‐atrum. However, when growth was started by inoculating with conidial suspension spread evenly over the plate, it was found that blue light inhibited conidiation in our strain of V. egaticinum. We most light‐sensitive phase was around 9 h after inoculation. A broad band blue light pulse of 10 J m−2 saturated the response. The inhibitory effect of blue light could be reversed by a subsequent ultraviolet (UV) radiation, but a further effect of blue light was lost after the UV pulse. Blue light inhibition was also prevented by IJV radiation administered before the blue light.
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