Methods and compositions for synergistic pre-emergent and post-emergent weed control are disclosed. In particular, the present disclosure relates to an herbicidal composition comprising at least one pre-emergent herbicide and at least one post-emergent herbicide, wherein the pre-emergent herbicide and the post-emergent herbicide synergistically inhibit pre-emergent and post-emergent development of a weed. The disclosure further relates to herbicidal compositions comprising isoxaben, 2,4-D, mecoprop-P, and dicamba.

Herbicidal mixtures comprising an auxin herbicide and an adjuvant comprising a salt having a quaternary ammonium cation and/or a phosphonium cation are described. The adjuvant reduces the volatility of the auxin herbicide and/or counteracts the negative impact on the volatility of the auxin herbicide caused by the addition of a co-herbicide. Methods of preparing the herbicidal mixtures are also described.

Herbicidal mixtures comprising an auxin herbicide and an adjuvant comprising a salt having a quaternary ammonium cation and/or a phosphonium cation are described. The adjuvant reduces the volatility of the auxin herbicide and/or counteracts the negative impact on the volatility of the auxin herbicide caused by the addition of a co-herbicide. Methods of preparing the herbicidal mixtures are also described.

Herbicidal mixtures comprising an auxin herbicide and an adjuvant comprising a salt having a quaternary ammonium cation and/or a phosphonium cation are described. The adjuvant reduces the volatility of the auxin herbicide and/or counteracts the negative impact on the volatility of the auxin herbicide caused by the addition of a co-herbicide. Methods of preparing the herbicidal mixtures are also described.

The present invention belongs to the technical field of pesticides, and particularly relates to an herbicidal composition comprising R-pyridyloxycarboxylic acid and derivative and an application thereof. The composition comprises an active ingredient A and an active ingredient B in an herbicidally effective amount, wherein, the active ingredient A is one or more compounds selected from an R-pyridyloxycarboxylic acid represented by formula I and salt, ester derivative thereof,

##STR00001## wherein, R.sub.1, R.sub.2 each independently represent halogen, C1-C6 alkyl, halo C1-C6 alkyl or C3-C6 cycloalkyl; R.sub.3 represents hydrogen, halogen, C1-C6 alkyl or halo C1-C6 alkyl; Q represents C1-C6 alkyl, etc.; Y represents amino, etc.; the active ingredient B is selected from the following one or more compounds or acid or salt or ester derivatives thereof, ALS inhibitor, ACCase inhibitor, PSII inhibitor, HPPD inhibitor, PDS inhibitor, DOXP inhibitor, PPO inhibitor, Synthetic hormone, EPSPS inhibitor, GS inhibitor, PSI inhibitor. The composition is capable of effectively controlling various weeds, and has the following advantages: exhibiting a broad spectrum of weed control, being used in a reduced dose, and being capable of bringing about a synergistic effect and removing resistant weeds.

The present invention belongs to the technical field of pesticides, and particularly relates to an herbicidal composition comprising R-pyridyloxycarboxylic acid and derivative and an application thereof. The composition comprises an active ingredient A and an active ingredient B in an herbicidally effective amount, wherein, the active ingredient A is one or more compounds selected from an R-pyridyloxycarboxylic acid represented by formula I and salt, ester derivative thereof,

##STR00001## wherein, R.sub.1, R.sub.2 each independently represent halogen, C1-C6 alkyl, halo C1-C6 alkyl or C3-C6 cycloalkyl; R.sub.3 represents hydrogen, halogen, C1-C6 alkyl or halo C1-C6 alkyl; Q represents C1-C6 alkyl, etc.; Y represents amino, etc.; the active ingredient B is selected from the following one or more compounds or acid or salt or ester derivatives thereof, ALS inhibitor, ACCase inhibitor, PSII inhibitor, HPPD inhibitor, PDS inhibitor, DOXP inhibitor, PPO inhibitor, Synthetic hormone, EPSPS inhibitor, GS inhibitor, PSI inhibitor. The composition is capable of effectively controlling various weeds, and has the following advantages: exhibiting a broad spectrum of weed control, being used in a reduced dose, and being capable of bringing about a synergistic effect and removing resistant weeds.

Provided are combinations of one or more HPPD inhibitors selected from an isoxazole, a triketone, and a callistemone; a cereal crop safener selected from mefenpyr-diethyl, cloquintocet and cloquintocet-mexyl; and one or more of the herbicides, selected from the following groups: i) a PSII inhibitor, including bromoxynil, ioxynil, and chlorotoluron ii) a synthetic auxin, including halauxifen-methyl, fluroxypyr and MCPA iii) a PPO inhibitor, including bifenox iv) a PDS inhibitor, including flurochloridone, diflufenican and picolinafen.
A method for controlling unwanted vegetation applying such a combination to a cereal crop is also described.

Provided are combinations of one or more HPPD inhibitors selected from an isoxazole, a triketone, and a callistemone; a cereal crop safener selected from mefenpyr-diethyl, cloquintocet and cloquintocet-mexyl; and one or more of the herbicides, selected from the following groups: i) a PSII inhibitor, including bromoxynil, ioxynil, and chlorotoluron ii) a synthetic auxin, including halauxifen-methyl, fluroxypyr and MCPA iii) a PPO inhibitor, including bifenox iv) a PDS inhibitor, including flurochloridone, diflufenican and picolinafen.
A method for controlling unwanted vegetation applying such a combination to a cereal crop is also described.

The present invention relates to a method of controlling undesirable vegetation in a field containing an auxin-herbicide-tolerant cotton crop by applying to the location where control is desired an effective amount of 2,4-DB.

The present invention relates to a method of controlling undesirable vegetation in a field containing an auxin-herbicide-tolerant cotton crop by applying to the location where control is desired an effective amount of 2,4-DB.