Abstract
Colletotrichum acutatum is cosmopolitan and causes diseases in many crops including Hevea brasiliensis. It sporulated freely on PDA at 10–40 °C with peaks at around 15° and 25°. Self-inhibition of spore germination occurred at concentrations above 8 x 106 spores ml−1. Ultraviolet radiation (especially 254 nm) inactivated the spores. Spore germination was around 90% between 15–35°. Free water promoted spore germination but was not essential; high relative humidity (95%) was sufficient. Spores could also withstand temperatures up to 35°. It is concluded that the most favourable conditions for the spread of C. acutatum are prevalent in the major rubber growing areas in Sri Lanka throughout the monsoons.
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