Abstract
The pycnospore formation of Diaporthe citri was markedly increased when the fungus was cultured under the continuous illumination of “black-light blue” (BLB) fluorescent lamp. The effective wave length was 324 or 355nm, obtained through interference filters. When the young colonies grown under the continuous darkness were exposed to BLB, α-spores were formed at relatively low temperatures and β-spores at high temperatures.
