Sons of the Soil by Honoré De Balzac

The scene at Conches had, apparently, a good effect on the peasantry; on the other hand, the count's faithful keepers were more than ever watchful that only dead wood should be gathered in the forest of Les Aigues. But for the last twenty years the woods had been so thoroughly cleared out that very little else than live wood was now there; and this the peasantry set about killing, in preparation for winter, by a simple process, the results of which could only be discovered in the course of time. Tonsard's mother went daily into the forest; the keepers saw her enter; knew where she would come out; watched for her and made her open her bundle, where, to be sure, were only fallen branches, dried chips, and broken and withered twigs. The old woman would whine and complain at the distance she had to go at her age to gather such a miserable bunch of fagots.

But she did not tell that she had been in the thickest part of the wood and had removed the earth at the base of certain young trees, round which she had then cut off a ring of bark, replacing the earth, moss, and dead leaves just as they were before she touched them. It was impossible that any one could discover this annular incision, made, not like a cut, but more like the ripping or gnawing of animals or those destructive insects called in different regions borers, or turks, or white worms, which are the first stage of cockchafers. These destructive pests are fond of the bark of trees; they get between the bark and the sap-wood and eat their way round. If the tree is large enough for the insect to pass into its second state (of larvae, in which it remains dormant until its second metamorphose) before it has gone round the trunk, the tree lives, because so long as even a small bit of the sap-wood remains covered by the bark, the tree will still grow and recover itself.