| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 158.51 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Phytophthora cinnamomi (23 isolates) and P. cambivora (3 isolates), isolated
from chestnut showing ink disease symptoms or from soil near dead roots of chestnut
trees were tested to copper and phosphite sensitivity. Isolates were characterized using
an amended agar assay. EC50 values (copper (or phosphite) concentration inhibiting
mycelial growth of the pathogen by 50%) for each isolate were calculated by plotting
probit percentage inhibition against log10 active ingredient (a.i.) concentration. EC50
values of copper ranged from 0.043×10-3 to 2.025×10-3 M in P. cinnamomi and
1.970×10-3 to 4.603×10-3 M in P. cambivora. EC50 values of phosphite ranged from 2.99
to 172.39 μg ml-1 in P. cinnamomi and 47.23 to 237.25 μg ml-1 in P. cambivora. This
study may contribute to access the potential utility of these a.i. for managing ink
disease of chestnut and to use in the future as benchmark for baseline sensitivity.
Description
Keywords
Phytophthora cinnamomi P. cambivora Ink disease of chestnut
Citation
Coelho, Valentim; Coutinho, S.; Gouveia, Eugénia (2005). Sensitivity to Copper and Phosphite of Phytophthora Species Associated with Ink Diseases of Chestnut. In 3rd International Chestnut Congress. Chaves. Acta Horticulturae. ISSN 0567-7572. p. 641-644.