Both of only two grand valley oaks at work are deteriorating. Sadly, the prognosis for the smaller of the two is not so good.

1. Quercus lobata, valley oak is obviously distressed. It should not start to defoliate until after cool weather later in autumn. Even then, defoliation should be more symmetrical.

2. Upon closer inspection, fluffy and newer interior growth is evidently comprising most of the canopy, while the exterior of the canopy is notably sparse. It is not a new problem.

3. The defoliated portion of the canopy appears to be completely necrotic. No foliage can be seen. If the tree survives, removal of this portion will severely disfigure its symmetry.

4. This significant cavity is developing on the formerly flawless trunk. The interior wood is badly decayed. Sadly, the tree may not live long enough for this to become a concern.

5. Cupressus macrocarpa, Monterey cypress, next to the valley oak, is likely succumbing to cypress bark canker. A few trees have already been removed. It is also a slow process.

6. Meanwhile, in other news, a collared mountain lion was seen on surveillance video in the neighborhood. We all know that they live here, but it is different to actually see one.

Anyone who would like to participate in this meme should peruse this participant guide for Six on Saturday.