New Zealand Plant Protection 63 (2010): 28-32
Viability and germination of conidia of three Botryosphaeriaceae species, which are important grapevine pathogens, were significantly affected by exposure to different levels of sunlight and relative humidity (RH). After 7 h exposure to non-filtered sunlight (+UV), filtered sunlight (-UV) and shade, germination differed between light levels, being 35, 57 and 81%, respectively, and after 70 h exposure it was 0, 21 and 65%, respectively. Non-germinated conidia were unable to germinate when placed in a moist environment, indicating that they had been killed. High RH favoured germination since 91 and 70%, respectively, germinated after 3 h in 100 and 97% RH. However, in 93% RH, only 44% germinated by 24 h and in 84% RH no conidia germinated. The inhibition of germination was temporary since replacement in a moist environment caused conidia to germinate. Light and RH effects were similar for the three species.
Keywords: Neofusicoccum luteum, Neofusicoccum australe, Diplodia mutila, solar radiation, humidity, conidia.
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Copyright © 2010 New Zealand Plant Protection Society (Inc.).