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1 March 2000 Negative cross-resistance in triazine-resistant biotypes of Echinochloa crus-galli and Conyza canadensis
Grzegorz Gadamski, Dorota Ciarka, Jonathan Gressel, Stanislaw W. Gawronski
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Whole-plant, negative cross-resistance was studied in Conyza canadensis and Echinochloa crus-galli, important global weeds. Negative cross-resistance can be a most useful preemptive, cost-effective tool for delaying the evolution of resistance, as well as for resistance management, after resistant populations evolve. Seeds of triazine-resistant and -susceptible biotypes were collected in or near orchards that had been continuously treated with atrazine for more than 10 yr. Plants grown from the seeds were treated, in a greenhouse, with herbicides from the following chemical families: triazine, benzothiadiazole, phenyl-pyridazine, arylophenoxy-propionate, cyclohexanedione, phenoxycarboxylic acid, pyridine carboxylic acid, phosphinic acid, glycine phosphate, chloroacetamide, sulfonylurea, and bipyridylium. Eleven of the 18 herbicides tested exerted significant negative cross-resistance against atrazine-resistant weeds, ranging from 0.03 to 0.67 of the concentration required to affect the triazine-sensitive type. No synergism was found between bentazon and fluroxypyr in mixture on Conyza, even though both separately exerted negative cross-resistance. Using a mixture with half the amount of each component lowers the environmental effect of each component while controlling a broader spectrum of other weeds.

Nomenclature: Bentazon; fluroxypyr; Echinochloa crus-galli (L.) Beauv. ECHCG, barnyardgrass; Conyza canadensis (L.) Cronq. ERICA, horseweed.

Grzegorz Gadamski, Dorota Ciarka, Jonathan Gressel, and Stanislaw W. Gawronski "Negative cross-resistance in triazine-resistant biotypes of Echinochloa crus-galli and Conyza canadensis," Weed Science 48(2), 176-180, (1 March 2000).[0176:NCRITR]2.0.CO;2
Received: 10 July 1998; Accepted: 16 January 2000; Published: 1 March 2000
collateral sensitivity
herbicide mixture
triazine resistance
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