Avo graveyard

This is the view now looking west from Ladera Frutal HQ.

Avo_graveyard.JPG copy

An avocado grove has been stumped and the trunks whitewashed. This is now a common sight in these parts, as trees that had their tops severely killed back in the freeze in January are being prepared for re-grafting on to the still-alive tissues of the trunks.* The whitewashing protects the trunks from sunburn; like many broadleafed evergreens, avocados have thin bark. Deciduous trees tend to have tough bark, because they spend a significant part of their lives without foliar canopy. Obviously, for an evergreen, a lack of canopy is an anomaly.

In the photo, at elevations just below the whitewashed trunks, one can see citrus trees (grapefruit, mostly) which have no damage from the freeze. (The entire canyon is now scented with their blooms!) And on the distant hilltops, the dark green represents avocado trees flourishing where they were planted high above the freeze line.

The following view is to the southeast, also from LF HQ, looking across the canyon. It shows quite starkly how freeze damage is a threshold phenomenon. There is no gradation in the visible damage as one goes up the slope. Rather, there is a line–the precise elevation of which differs with the contours of the hills and their sun exposure and air drainage. Below the line, devastation. Above it, healthy trees.

Avo freeze line_2.JPG

The damaged parts of this grove likewise have now been stumped and whitewashed.

* Or, probably, simply letting them re-sprout, given that they probably have live tissues above the original Hass graft.

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