A new beetle that vectors a Fusarium dieback on avocado trees has been discovered in and near Los Angeles County. The newly discovered polyphagous shot hole borer beetle is indistinguishable from the tea shot hole borer beetle and is believed to be a new species of beetle.
Phytophthora mengei (P. citricola) and P. cinnamomi have been associated with trunk canker and collar rot of avocado. The pathogen infects the crown, lower trunk and limbs of older trees. The disease develops after crowns, limbs, or trunks become infected through wounds, such as injuries from equipment, pruning, vertebrate chewing, and wind damage.
The measures recommended for the control of Phytophthora avocado trunk canker disease are similar to those described for Phytophthora root rot. In fruit, prevention of infection is challenging because it is likely caused by the splashing of Phytophthora spores from the soil surface to the fruit during rainy weather.
A California avocado tree canker that occurs on twigs, branches or trunks is caused by a complex of fungal pathogens which include many species in the Botryosphaeriaceae family. Canker pathogens can enter and initiate infection through wounds on the bark surface, such as pruning, frost damage and mechanical injury wounds.
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