Safening composition of 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicides and cloquintocet-mexyl for cereal crops
View Patent ↗Herbicidal injury caused by 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylates in wheat and barley is reduced with the use of low rates of cloquintocet.
1. A composition for protecting wheat and barley from the harmful effects of a 6-(trisubstituted phenyl)-4-amino-2-pyridine-carboxylate herbicide of the formula (I)
wherein hal represents F, Cl or Br, and R represents methyl or ethyl, and its agriculturally acceptable salt, ester and amide derivatives which comprises, in addition to the 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicide, a safener from the quinolinyloxyacetate family of chemicals in which the weight ratio of 6-(trisubstituted aryl)-4-amino-2-pyridinecarboxylate herbicide to quinolinyloxyacetate safener is between 2:1 to about 64:1.
2. The composition of claim 1 in which the 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicide is a 4-amino-3-chloro-6-(4-chloro-2-fluoro-3-methoxyphenyl)-2-pyridinecarboxylic acid derivative or a 4-amino-3-chloro-6-(2,4-dichloro-3-methoxyphenyl)-2-pyridinecarboxylic acid derivative.
3. The composition of claim 1 in which the safener is cloquintocet mexyl.
4. The composition of claim 1 in which the weight ratio of the 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicide to the safener is between 4:1 and 32:1.
5. The composition of claim 1 , in which the weight ratio of the 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicide to the safener is from greater than 32:1 to 64:1.
6. The composition of claim 5 , in which the safener is cloquintocet mexyl.
7. A method of protecting wheat and barley from the harmful effects of a 6-(trisubstituted phenyl)-4-amino-2-pyridinecarboxylate herbicide of the formula (I)
wherein hal represents F, Cl or Br, and R represents methyl or ethyl, and its agriculturally acceptable salt, ester and amide derivatives which comprises contacting the wheat and barley with, or applying to the area under cultivation, a safener selected from the quinolinyloxyacetate family of chemicals in which the weight ratio of 6-(trisubstituted aryl)-4-amino-2-pyridinecarboxylate herbicide to quinolinyloxyacetate safener is between 2:1 to 64:1.
8. The method of claim 7 , in which the weight ratio of 6-(trisubstituted aryl) -4-amino-2-pyridinecarboxylate herbicide to quinolinyloxyacetate safener is from greater than 32:1 to 64:1.
9. The method of claim 8 , in which the safener is cloquintocet mexyl.