Boron in the soils and irrigation waters of southern California and its relation to citrus and walnut culture
AuthorsW. P. Kelley
S. M. Brown
Authors AffiliationsW. P. Kelley was Professor of Agricultural Chemistry in the Graduate School of Tropical Agriculture and Agricultural Chemist in the Experiment Station; S. M. Brown was Assistant Chemist in the Experiment Station.
Hilgardia 3(16):445-458. DOI:10.3733/hilg.v03n16p445. November 1928.
Abstract does not appear. First page follows.
In the latter part of 1925 and at various times subsequently, our attention has been called to certain citrus trees growing in the vicinity of several different citrus packing houses in southern California that have been injured severely. Usually the injury developed rather suddenly. In some instances only a few trees, in others several hundred, have been affected. In practically every case the trees were previously vigorous and thrifty.
The injury first became apparent by a yellowing of certain parts of the leaves, usually beginning with the tips and margins, and this was soon followed by a similar yellowing of the tissues between the veins. As the effect progressed the tips died back. Sometimes isolated areas along the margins of the leaves or small spots between the veins were killed. Many of the affected leaves fell prematurely and not infrequently the smaller twigs died. The more severely affected trees shed practically all of their leaves and in a few instances the entire tree died. The shedding of the leaves of the less severely affected trees was followed sooner or later by the development of new shoots
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