ISHS Acta Horticulturae 665: II International Symposium on Lychee, Longan, Rambutan and other Sapindaceae Plants
STUDIES ON THE BIOLOGICAL CHARACTERISTICS OF LYCHEE DOWNY BLIGHT |
| Authors: | J. Liu, A. Liu, W. Chen |
| Keywords: | blooming, fruit maturation, mycelial growth, sporulation, sporangium germination |
| Abstract:
Lychee downy blight (Peronophythora litchi Chen ex Lo) is one of the most important preharvest and post-harvest diseases of lychee. The effect of temperature, pH, light, carbon source and moisture on the mycelial growth, sporulation and sporangia germination of lychee downy blight was primarily studied. For the mycelial growth of the pathogen, the range of temperatures was 12-32°C, the optimum being 28-30°C, and the range of pH was 3-10, the optimum being 6-8. For the sporulation, the range of temperatures was 12-32°C, the optimum being 26-30°C, and the range of pH was 3-10, the optimum being 5-6. For the sporangium germination, the range of temperature was 10-34°C, the optimum being 20-26°C and the range of pH value was 3-10, the optimum being 5-6. The treatment of darkness with fluorescent or alternative fluorescent light did not have significant effect on the mycelial growth, sporulation or sporangium germination. Only in free water, the sporangium was able to germinate. The starch, sucrose, glucose and maltose could promote the mycelial growth. | |
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