University of California

Progress report on Johnsongrass control in orchards


C. L. Elmore
A. H. Lange
L. L. Buschmann
R. B. Jeter
J. J. Smith

Authors Affiliations

Clyde L. Elmore is Extension Weed Control Technologist, Agricultural Extension Service, U. C., Davis; Arthur H. Lunge is Extension Weed Control Specialist, U. C., Riverside; Leonard L. Buschmann is Farm Advisor, Sutter County; Roy B. Jeter is Farm Advisor, Glenn County; John J. Smith is Farm Advisor, Placer County.

Publication Information

Hilgardia 21(5):6-7. DOI:10.3733/ca.v021n05p6. May 1967.

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Johnsongrass, Sorghum halepense, is the most serious perennial weed control problem in California orchards. This fast-growing, warm-season weed propagates prolifically from seed and underground rhizomes. The fleshy underground stems provide the necessary overwintering mechanism by which this plant gets an early start in competing with crop plants, as well as other weeds. In established trees and in young, producing orchards, competition from Johnsongrass may reduce nutrients, moisture, and light. In a field test at the Kearney Field Station, Fresno County, Johnsongrass seedlings were controlled in the nursery row with various soil-persistent herbicides. MSMA is not currently registered (or recommended by University of California) for orchard use. Dalapon is not registered for use on walnuts or almonds.

Elmore C, Lange A, Buschmann L, Jeter R, Smith J. 1967. Progress report on Johnsongrass control in orchards. Hilgardia 21(5):6-7. DOI:10.3733/ca.v021n05p6
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