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Factors affecting spore production, germination and viability of Colletotrichum acutatum isolates from Hevea brasiliensis

Published online by Cambridge University Press:  01 June 2000

T. H. P. S. FERNANDO ,
C. K. JAYASINGHE  and
R. L. C. WIJESUNDERA
T. H. P. S. FERNANDO
Affiliation:
Rubber Research Institute of Sri Lanka, Dartonfield, Agalawatta, Sri Lanka
C. K. JAYASINGHE
Affiliation:
Rubber Research Institute of Sri Lanka, Dartonfield, Agalawatta, Sri Lanka
R. L. C. WIJESUNDERA
Affiliation:
Department of Botany, University of Colombo, Colombo 3, Sri Lanka
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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 8×106 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.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 6 , June 2000 , pp. 681 - 685
Copyright
© The British Mycological Society 2000

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