When avocado plants are flooded they mainly react by rapid collapse and death. One of the mechanisms, depicted in the attached photo is the development of swollen lenticels called lenticel hypertrophy.
You can read about flooding, reduced oxygen and hypertrophy by searching avocadosource.com for Bruce Schaffer, Pilar Gil, Randy Ploets and others.
Effects of Flooding and Phytophthora Root Rot on Net Gas Exchange of Avocado in Dade County, Florida
Edranol lenticel hypertrophy, photo by Reuben Hofshi
California Avocado Comments 