Greetings fellow Foxies,
 Have you noticed large numbers of dead leaves on local wandoos, particularly where a whole twig or small branch has died?
This condition where wandoos die back and leave dead branches projecting though the leaf canopy is called Wandoo Crown Decline. This is a cyclical problem that caused huge damage in the 1990’s when the Wandoo Recovery Group was formed.
Research showed that boring insects and associated pathogenic fungi, are the principal agents disrupting stem nutrient and water conducting channels. Symptoms are worse in dry autumns, but underlying factors driving the long term cycle are unresolved.
This autumn I couldn’t find any pattern of areas affected. There are a couple of monitoring sites in Foxes Lair that don’t appear to have a lot of very recent damage. Affected trees in Foxes Lair seem to be randomly distributed, but badly affected ones have obviously been repeatedly attacked.
Being a loyal citizen scientist, I nipped out and sampled a couple of branches from a badly affected tree for close analysis.
My first observation was that the branches were distorted and gangly with lots of dead lower shoots, stems with dark cankers (sunken dead lesions) and resprouting shoots. Clearly not a single year problem.
Looking closely, it was amazing to see so many things attacking the tree. I found stem and leaf galls, and leaf damage from a range of chewing insects, but the real cause of branch death is inside the stems.

The insect involved is a jewel beetle Cisseis fascigera). Beetles emerge from November to February, mate and lay eggs on stems. The larva that looks like a witchetty grub chews tissue and wood inside and along the stems (longitudinal galleries), before pupating in its gallery and emerging a year later.
Unfortunately the insect introduces spores of rot fungi that spread through the stem.

Greetings fellow Foxies,
No, this is not an exposition on shock jocks or pompous politicians.
Every year I marvel at the lovely colours and textures of  our eucalypts when they are shedding old bark. This, in addition to their unique flowers make them amazing, and underappreciated by most Australians.
The arboretum is a good place to see the range of bark types, particularly in the summer/autumn. This Foxypress shows the progression of bark regrowth in brown mallet, and I hope you enjoy the sample of other trees below.

Greetings fellow Foxies,
These plants belong to the Casuarinaceae family and are instantly recognised by their needle- like foliage and the wonderful sighing sound of the wind passing through them. Around Narrogin we tend to notice the trees most: Rock sheoak; Allocasuarina huegeliana on well drained soils, and salt sheoak; Casuarina obesa in semi saline lakes and waterways. A bed of sheoak needles with a whispering wind overhead is a wonderful place for courting couples (after they have repelled the ants, ticks and mosquitos). The name casuarina is derived from the Malay word for cassowary, due to similarities of layered feathers/ needles. If you look closely at a needle you will notice rings of scales that are the true leaves. The green needles are in fact photosynthesizing stems.
Tammas or tammars, are bushy plants that become dominant on gravelly soils general east of a line through Yealering and Harrismith.
 
A feature of them all is that they have boy and girl plants, but differ from the animal world in that the girls have the nuts (that look like cones). Casuarinas and Allocasuarinas have subtle differences in nut structure.
Males produce pollen that is blown by wind to female flowers. Like most wind pollinated species, huge amounts of pollen are produced, and you will notice now green female and orange pollen- bearing males everywhere.
The vast majority of plants in the bush have root modifications (cluster or proteoid roots) and alliances with fungi (mycorrhizas) to forage for phosphorus and/or gain water from tiny soil pores.
Plants on poor sand or gravel soils mainly have cluster roots that are also instrumental in forming gravels.
Eucalypts and other plants on more fertile soils mainly use mycorrhizas.
Casuarinaceae have cluster roots, ectomycorrhizas (where the fungus does not invade the plant root), AND nodules where bacteria produce nitrogen like legumes. They are truly adaptable plants.
 
Rock sheoak is a particularly aggressive colonising species. The name comes from them originally being most common around granite rocks, but they have spread greatly on roadsides and other well drained areas where trees have been removed. I frequently see roads with remnant wandoo vegetation on one side of a road and rock sheoak thicket on the disturbed other side. The  PDF below shows images relevant to this district

There are lots of tammas (all Allocasuarinas), particularly on kwongan gravels, but they are often overlooked because they don’t have conventional flowers. Foxes lair has dwarf sheoak; Allocasuarina humilis on gravels and Allocasuarina microstachyia that only occurs on the south side of the Claypit.
My favourite is the compass bush; Allocasuarina pinaster that occurs in the Lake Grace area on grey sandy gravels. The nearest Location is Holden Road near Tarin Rock. See me for location.

Greetings fellow Foxies,
Marri trees are flowering profusely this year, possibly due to the February rains. However I have noticed a lot of red gum oozing from adult trees and a few have died spontaneously in recent years. The penny dropped when I saw beautiful adult marris in a Perth (and later Narrogin) garden with unblemished bark, in stark contrast to scabby specimens in Foxes Lair. The gum is a defence mechanism against damage by mainly woodborers. 
As Foxes Lair is on the eastern edge of marri range, marris are under more water stress, slower growing, and more susceptible to parasites.