Abstract
Bark wounds of avocado (Persea americana) stems of the cultivar Topa Topa became resistant to infection by Phytophthora citricola within 12-14 days after injury. The size of cankers declined significantly as the time interval between wounding and inoculation increased. Wounds that were reinjured after 2 mo of aging became susceptible to infections similar to those of wounds made on previously unwounded stems. These results suggest that chemical treatment applied to fresh bark wounds must protect against P. citricola for at least 14 days to be effective. Fungicide treatments for curing as well as protecting avocado stems against trunk canker disease caused by P. citricola were investigated [...]
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