A picture from our excursion to a property at the edge of Lake Clifton. This tree stump shows the shallow root system of the Tuart. I'm not sure whether this one fell over or was 'pushed' but at the same time tuarts in Yalgorup have suffered severe decline.
“The Yalgorup region represents the largest unfragmented area of tuart woodland in WA and looking at historical satellite images we can tell that the severe decline started in the early 1990s in Yalgorup, but that decline is now escalating rapidly and is spreading to other areas,’’ Mr Barber said.
Paul Barber from the Tuart Health Research Group (2007) http://www.sciencewa.net.au/index.php?option=com_content&task=view&id=1650&Itemid=587
Phytophthora multivora has now been identified as a major factor in tuart dieback. However it seems that tree decline is a complex combination of other potential factors such as weeds, grazing, climate change, increased salinity in groundwater and insect attack.