Botrytis cinerea is one of the most destructive plant pathogens and is reported to infect more than 235 plant species worldwide. This survey was conducted to investigate the effect of different LED lights on B. cinerea growth and sporulation. 5mm mycelial plugs of Botrytis cinerea were placed on plates containing PDA and incubated under different LED lamps. UVa was found to promote sporulation in B. cinerea more than other lights. Green, red and continuous darkness had similar effects and there were no significant difference between them. The least sporulation was observed under white, violet and blue lights. The effect of lights, time and their interaction on fungal growth was significant. Maximum growth was observed at 7th day under blue light. 20 minute pretreatment of fungus before its incubation in the dark led to growth retardation at 2th day. Yellow light retarded linear growth of fungus as well as its sporulation. It is clear that light has significant effect on B. cinerea. The effect of different lights on B. cinerea secondary metabolites, especially those involve in its pathogenicity, is under investigation and it is expected that the combination of its result with present study data may lead us to consider LED lamps as a potential control strategy for this fungus.
