Copper deficiency of almonds: Applications of copper compounds to trees near Paso Robles produced response in leaf growth, corrected kernel shrivel
California Agriculture 10(6):13-16.
Published June 01, 1956
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Poor growth and a rough bark condition in a group of almond trees in the Paso Robles area attracted attention in 1952. Some trees showed considerable gumming of the trunks and lower parts of the main branches.