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Imazapyr Applied Postemergence in Sunflower (Helianthus annuus) for Broomrape (Orobanche cernua) Control

Published online by Cambridge University Press:  12 June 2017

Luis Garcia-Torres ,
Mercedes Castejon-Muñoz ,
Francisca Lopez-Granados  and
Montserrat Jurado-Exposito
Luis Garcia-Torres
Affiliation:
Institute for Sostenible Agriculture, CSIC, Apartado 4084, 14080-Cordoba, SPAIN. (fax 57-202721/ 293433)
Mercedes Castejon-Muñoz
Affiliation:
Institute for Sostenible Agriculture, CSIC, Apartado 4084, 14080-Cordoba, SPAIN. (fax 57-202721/ 293433)
Francisca Lopez-Granados
Affiliation:
Institute for Sostenible Agriculture, CSIC, Apartado 4084, 14080-Cordoba, SPAIN. (fax 57-202721/ 293433)
Montserrat Jurado-Exposito
Affiliation:
Institute for Sostenible Agriculture, CSIC, Apartado 4084, 14080-Cordoba, SPAIN. (fax 57-202721/ 293433)
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Abstract

Field studies were conducted from 1991 through 1994 in several locations of Southern Spain to determine the efficacy of imazapyr as late postemergence application in sunflower for broomrape control and the crop response to this herbicide under weed-free conditions. Single applications of imazapyr at 10 to 15 g/ha on sunflower plants at about the V12 (12 leaves) to V19 (19 leaves) growth stages, infected with broomrape plants at the predominant growth stages “c” (small nodule with shoot bud visible) and “d” (shoot bud and roots well developed), resulted in effective control without damaging the crop. Double applications of imazapyr at 10 + 10 g/ha at about the same crop growth stages V12 to V19, at a time interval of 12 to 14 d between single applications, were also efficacious and well tolerated by the crop. The same herbicide treatments applied to weed-free sunflower did not adversely affect the biomass, head diameter or yield of the crop as compared with the nontreated check. As a result of the low rate of imazapyr required for broomrape control, the herbicide treatments are economical (about $3 to $6/ha), non-residual and not affected by the type of soil texture and rainfall conditions.

Keywords

Imazapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-pyridinecarboxylic acidbroomrape, Orobanche cernua Loelf. # ORACE/O. cumana Wall. # ORACUsunflower, Helianthus annuus L.Low-dose herbicide technologyparasitic weedsORACEORACU
Type
Research
Information
Weed Technology , Volume 9 , Issue 4 , December 1995 , pp. 819 - 824
Copyright
Copyright © 1995 by the Weed Science Society of America 

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