Clonal Selection in Relation to Disease of Lemon Trees

Abstract

In the literature on lemon culture in California there are frequent references to tree deterioration commonly called "lemon decline," or other names which emphasize the relatively short period of usefulness of some lemon trees in this state. Decline has often been transitory but recurrent. Some trees that have been severely affected appeared normal two or three years later. This characteristic of many lemon orchards is in great contrast to many of the old and useful orange and grapefruit orchards.