University of California

Avocado root rot soil survey


R. M. Burns
K. D. Gowans
R. B. Harding
G. A. Zentmyer

Authors Affiliations

Robert M. Burns is Extension Horticulture Technologist, University of California, Riverside; K. D. Gowans is Associate Soil Specialist, U. C., Davis; R. B. Harding is Associate Chemist, U. C., Riverside; G. A. Zentmyer is Plant Pathologist, U. C., Riverside.

Publication Information

Hilgardia 16(5):6-7. DOI:10.3733/ca.v016n05p6. May 1962.

PDF of full article, Cite this article


Avocado root rot, caused by the fungus Phytophthora cinnamomi, is the most important disease affecting avocados throughout the world. In California approximately 4,000 acres of avocados have been damaged. Trees growing in many types of soils have been affected, but the amount or extent of damage is much greater on some soils than on others. Previous investigators have pointed out that when the fungus is present, avocado trees growing in soils with poor internal drainage are most susceptible to root rot damage. Recent surveys have shown that the rate of spread is usually slow on deep, medium-textured (loam, fine sandy loam) soils and will range from moderate to rapid on many other soils.

Burns R, Gowans K, Harding R, Zentmyer G. 1962. Avocado root rot soil survey. Hilgardia 16(5):6-7. DOI:10.3733/ca.v016n05p6
Webmaster Email: sjosterman@ucanr.edu