Response to the article “Relative importance of site, weather and Phytophthora cinnamomi in the decline and death of Eucalyptus marginata - jarrah dieback investigations in the 1970s to 1990s E M Davison, (2018) 47,245”
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May I offer a comment on the recent article in your Journal by Dr E Davison. I am a forester, not a plant pathologist, but for 30 years, from 1964, I was associated with various aspects of jarrah dieback, including: mapping from aerial photos, screening for resistance, ecology, the introduction of quarantine, development of hygiene protocols, monitoring of logging trials, policy and the implementation of dieback protection plans for various National Parks.
I have no doubt that site conditions and waterlogging play a substantial role in the disease syndrome observed in the (Eucalyptus marginata) jarrah forest, but there are still many questions that remain. Jarrah is not favoured by wetter sites and is replaced there by bullich (E megacarpa), blackbutt (E patens) and marri (Corymbia calophylla). I have no doubts that waterlogging alone can rapidly kill mature jarrah trees and have observed this myself , especially in forest located below sumps in cleared bauxite pits where the soil was...