HERBICIDAL COMPOSITION AND METHOD FOR CONTROLLING WEEDS

Abstract

Provided are a herbicidal composition having excellent control effect on weeds and a method for controlling weeds. The herbicidal composition comprising one or more PPO-inhibiting herbicides selected from the group consisting of flumioxazin, flumiclorac-pentyl, lactofen, carfentrazone-ethyl, sulfentrazone, tiafenacil, trifludimoxazin, and a compound represented by the following formula (I):

##STR00001##

wherein X represents CH or a nitrogen atom, and Z represents CH or a nitrogen atom, and glufosinate or a salt thereof, wherein a weight ratio of the PPO-inhibiting herbicide to the glufosinate or a salt thereof is 1:150 to 1:700.

Claims

1. A herbicidal composition comprising one or more PPO-inhibiting herbicides selected from the group consisting of flumioxazin, flumiclorac-pentyl, lactofen, carfentrazone-ethyl, sulfentrazone, tiafenacil, trifludimoxazin, and a compound represented by the following formula (I): ##STR00008## wherein X represents CH or a nitrogen atom, and Z represents CH or a nitrogen atom, and glufosinate or a salt thereof, wherein a weight ratio of the PPO-inhibiting herbicide to the glufosinate or a salt thereof is 1:150 to 1:700.

2. The herbicidal composition according to claim 1, wherein the PPO-inhibiting herbicide is flumioxazin.

3. The herbicidal composition according to claim 1, wherein the PPO-inhibiting herbicide is a compound represented by formula (I) and, in the formula (I), X is CH, and Z is a nitrogen atom.

4. A method for controlling weeds, comprising a step of simultaneously or sequentially in any order applying one or more PPO-inhibiting herbicides selected from the group consisting of flumioxazin, flumiclorac-pentyl, lactofen, carfentrazone-ethyl, sulfentrazone, tiafenacil, trifludimoxazin, and a compound represented by the following formula (I): ##STR00009## wherein X represents CH or a nitrogen atom, and Z represents CH or a nitrogen atom, and glufosinate or a salt thereof, wherein a weight ratio of the PPO-inhibiting herbicide to the glufosinate or a salt thereof is 1:150 to 1:700.

5. The method for controlling weeds according to claim 4, wherein the PPO-inhibiting herbicide is flumioxazin.

6. The method for controlling weeds according to claim 4, wherein the PPO-inhibiting herbicide is a compound represented by formula (I) and, in the formula (I), X is CH, and Z is a nitrogen atom.

7. The method for controlling weeds according to claim 4, wherein the weeds to be controlled are waterhemp (Amaranthus tuberculatus=Amaranthus rudis=Amaranthus tamariscinus) having a substitution of an amino acid residue of G210A in PPX2.

Description

EXAMPLES

[0229] Hereinbelow, the present invention will be described in more detail by way of Examples. However, the present invention is not limited by these Examples.

[0230] At first, criteria for the evaluation of the herbicidal effect and the harmful effect on crops shown in the below-mentioned examples will be described.

[Herbicidal Effect and Harmful Effect on Crops]

[0231] The herbicidal effect was rated within a range of 0 to 100, wherein “0” was a rating where the state of emergence or growth of a sample weed during a test had no difference or little difference compared with the state of the test weed that did not subjected to the treatment, and “100” was a rating where the test plant was completely killed or the emergence or growth of the test weed was completely suppressed.

[0232] The harmful effect on crops was rated as “harmless” when little harmful effect was observed, “low” when a moderate level of harmful effect was observed, “medium” when a medium level of harmful effect was observed, and “high” when a high level of harmful effect was observed.

Example 1

[0233] The weeds (palmer amaranth (Amaranthus palmeri), waterhemp (Amaranthus tuberculatus=Amaranthus rudis=Amaranthus tamariscinus), common ragweed (Ambrosia artemisiifolia), giant ragweed (Ambrosia trifida), marestail (Conyza canadensis), common lambsquarters (Chenopodium album), kochia (Kochia scoparia), common barnyardgrass (Echinochloa crus-galli) and giant foxtail (Setaria faberi)) and soybeans (CZ3929GTLL: LibertyLink GT27) are seeded in a plastic pot. The weeds are then cultivated in a greenhouse, and at 21 days after the seeding, a spray liquid prepared by diluting a flumioxazin formulation (Valor SX: manufactured by Valent USA) and a glufosinate-ammonium formulation (Liberty 280SL: manufactured by BASF) with water is applied to the foliage at a spray volume of 200 L/ha so that the application rate of the flumioxazin might be 1 or 2 g/ha and the application rate of glufosinate-ammonium might be 590 g/ha. The weeds are further cultivated in a greenhouse, and at 7 days and 14 days after the application, the effect on the weeds is investigated. A synergistic weed control effect compared to the single use of each of the compounds is confirmed.

Example 2

[0234] The application is performed in the same manner, except that the glufosinate-ammonium formulation in Example 1 is replaced by a glufosinate-P-sodium formulation (Zaxa soluble liquid: manufactured by Meiji Seika Pharma Co., Ltd.) and the application rate of glufosinate-P-sodium is replaced by 280 g/ha.

Examples 3 to 4

[0235] The application is performed in the same manner, except that the flumioxazin formulation in Examples 1 to 2 is replaced by an emulsifiable concentrate of the compound X (containing 55 g/L of the compound X).

Examples 5 to 6

[0236] The application is performed in the same manner, except that the flumioxazin formulation in Examples 1 to 2 is replaced by a trifludimoxazin formulation (suspension concentrate containing 500 g/L of triaudimoxazin).

Examples 7 to 8

[0237] The application is performed in the same manner, except that the flumioxazin formulation in Examples 1 to 2 is replaced by a formulation of the compound Z (suspension concentrate containing 500 g/L of the compound Z).

Example 9

[0238] A plastic pot was filled with soil, then waterhemp (Amaranthus tuberculatus=Amaranthus rudis=Amaranthus tamariscinus) having the substitution of an amino acid residue of G210A in PPX2 was seeded, followed by cultivation in a greenhouse for 41 days. Each of a spray liquid obtained by diluting an emulsifiable concentrate of a predetermined amount of the compound X with water containing a spreading agent, a spray liquid obtained by diluting a predetermined amount of glufosinate-ammonium formulation with water containing a spreading agent, and a spray liquid obtained by diluting a predetermined amount of an emulsifiable concentrate of the compound X and a predetermined amount of glufosinate-ammonium formulation with water containing a spreading agent was uniformly sprayed from above the pot using a spraying machine so that the spray volume might be 216 L/ha. After cultivation in a greenhouse for 28 days, herbicidal effect was investigated. The results are shown in Table 1.

TABLE-US-00001 TABLE 1 Application rate of g Application rate lufosinate-ammonium of compound X Herbicidal effect — 0.5 g/ha 17 — .sup. 1 g/ha 18 350 g/ha — 37 350 g/ha 0.5 g/ha 70 350 g/ha .sup. 1 g/ha 71

Example 10

[0239] A plastic pot was filled with soil, waterhemp (Amaranthus tuberculatus=Amaranthus rudis=Amaranthus tamariscinus) having the substitution of an amino acid residue of G210A in PPX2 was seeded, followed by cultivation in a greenhouse for 41 days. Each of a spray liquid obtained by diluting a predetermined amount of an emulsifiable concentrate of trifludimoxazin (emulsifiable concentrate containing 50 g/L of trifludimoxazin) with water containing a spreading agent, a spray liquid obtained by diluting a predetermined amount of a glufosinate-ammonium formulation with water containing a spreading agent, and a spray liquid obtained by diluting a predetermined amount of an emulsifiable concentrate of trifludimoxazin and a predetermined amount of a glufosinate-ammonium formulation with water containing a spreading agent was uniformly sprayed from above the pot using a spraying machine so that the spray liquid amount might be 216 L/ha. After cultivation in a greenhouse for 28 days, herbicidal effect was investigated.

[0240] The results are shown in Table 2.

TABLE-US-00002 TABLE 2 Application rate of g Application rate lufosinate-ammonium of trifludimoxazin Herbicidal effect — 0.5 g/ha 10 350 g/ha — 37 350 g/ha 0.5 g/ha 68

INDUSTRIAL APPLICABILITY

[0241] The present composition and the present method can be used for controlling weeds effectively.