Soybean disease control composition and soybean disease control method

Abstract

There are provided a soybean disease control composition containing, as active ingredients, (a) fluazinam or a salt thereof and (b) at least one fungicide selected from the group consisting of carboxamide-based compounds and azole-based compounds; and a method for controlling a soybean disease, which includes applying the soybean disease control composition to a soybean plant or soil.

Claims

1. A soybean disease control composition comprising active ingredients, wherein the active ingredients consist of (a) fluazinam or a salt thereof and (b) at least one carboxamide-based compound selected from the group consisting of benzovindiflupyr.

2. The soybean disease control composition according to claim 1, wherein the mixing weight ratio of (a) fluazinam or the salt thereof to (b) the at least one carboxamide-based compound is from 1:10,000 to 10,000:1.

3. A method for controlling a soybean disease, which comprises applying a soybean disease control composition containing active ingredients, wherein the active ingredients consist of (a) fluazinam or a salt thereof and (b) at least one carboxamide-based compound selected from the group consisting of benzovindiflupyr.

4. The method for controlling a soybean disease according to claim 3, wherein the soybean disease is rust.

Description

EXAMPLES

(1) Test Examples relevant to the present invention will be described in the following but they should not be construed as limiting the present invention.

Test Example 1: Test on Spore Germination Inhibition Against Soybean Rust Fungus (Phakopsora pachyrhizi)

(2) A spore suspension of soybean rust fungus was added to an aqueous chemical solution prepared so as to contain each test compound in a predetermined concentration and the whole was kept in a moist chamber at 25° C. for 5 hours. Thereafter, the presence of spore germination was investigated using a microscope, the spore germination rate was determined, and the spore germination inhibition rate was determined according to the following calculation formula. The results are shown in Tables 1 to 6.
Spore germination inhibition rate=(1−a/b)×100 a: spore germination rate in treated section, b: spore germination rate in untreated section
Colby's formula=(X+Y)−XY/100 X: spore germination inhibition rate in single use of ingredient (a) Y: spore germination inhibition rate in single use of ingredient (b)

(3) Based on the obtained spore germination inhibition rate, the theoretical value (spore germination inhibition rate) was calculated using the Colby's formula. The theoretical value according to the Colby's formula was shown in brackets ( ) in Tables 1 to 6.

(4) In the case where the experimental value is higher than the theoretical value, the composition of the present invention has a synergistic effect on soybean rust fungus.

(5) TABLE-US-00001 TABLE 1 Fluazinam Cyproconazole 0.1 ppm 0 ppm 0.1 ppm 39% (34%) 9%   0 ppm 27% Spore germination rate in untreated section: 77.5%

(6) TABLE-US-00002 TABLE 2 Fluazinam Epoxiconazole 0.1 ppm 0 ppm  0.1 ppm 48% (30%) 5% 0.01 ppm 34% (28%) 1%   0 ppm 27% Spore germination rate in untreated section: 77.5%

(7) TABLE-US-00003 TABLE 3 Fluazinam Prothioconazole 0.1 ppm 0 ppm  0.1 ppm 100% (92%) 89% 0.01 ppm  59% (54%) 37%   0 ppm 27% Spore germination rate in untreated section: 77.5%

(8) TABLE-US-00004 TABLE 4 Fluazinam Tebuconazole 0.1 ppm 0 ppm  0.1 ppm 99% (92%) 88% 0.01 ppm 45% (36%) 12%   0 ppm 27% Spore germination rate in untreated section: 77.5%

(9) TABLE-US-00005 TABLE 5 Fluazinam Benzovindiflupyr 1 ppm 0 ppm 1 ppm 100% (86%) 52% 0.1 ppm    98% (84%) 45% 0 ppm 71% Spore germination rate in untreated section: 65%

(10) TABLE-US-00006 TABLE 6 Fluazinam Fluxapyroxad 1 ppm 0 ppm 1 ppm 99% (83%) 41% 0 ppm 71% Spore germination rate in untreated section: 65%

Test Example 2: Test on Mycelial Growth Inhibition Effect Against Soybean Rhizoctonia Rot (Rhizoctonia solani)

(11) A colony (4 mmϕ) obtained by preculture was inoculated to PSA containing a chemical agent of a predetermined concentration and, after culture at a room temperature of 20° C. for 2 days, the diameter of the grown colony was measured to determine a mycelial growth inhibition rate. The results are shown in Tables 7 to 11.
Mycelial growth inhibition rate=(1−A/B)×100 A: diameter of colony in treated section, B: diameter of colony in untreated section
Colby's formula=(X+Y)−XY/100 X: mycelial growth inhibition rate in single use of ingredient (a) Y: mycelial growth inhibition rate in single use of ingredient (b)

(12) Based on the obtained experimental value of the mycelial growth inhibition rate, the theoretical value of the mycelial growth inhibition rate was calculated using the Colby's formula. The theoretical value according to the Colby's formula was shown in brackets ( ) in Tables 7 to 11.

(13) In the case where the experimental value is higher than the theoretical value, the composition of the present invention has a synergistic effect on Rhizoctonia solani.

(14) TABLE-US-00007 TABLE 7 Fluazinam Cyproconazole 0.01 ppm 0.001 ppm 0 ppm 1 ppm 84% (82%) 85% (80%) 80% 0.1 ppm   48% (43%) 44% (35%) 34% 0.01 ppm   24% (20%) 27% (9%)  7% 0 ppm 14% 2%

(15) TABLE-US-00008 TABLE 8 Fluazinam Epoxiconazole 0.01 ppm 0 ppm 1 ppm 87% (85%) 83% 0.1 ppm   49% (48%) 39% 0 ppm 14%

(16) TABLE-US-00009 TABLE 9 Fluazinam Tebuconazole 0.01 ppm 0.001 ppm 0 ppm 1 ppm 77% (74%) 84% (70%) 70% 0.1 ppm   44% (41%) 37% (32%) 31% 0.01 ppm   37% (29%) 35% (19%) 17% 0 ppm 14% 2%

(17) TABLE-US-00010 TABLE 10 Fluazinam Benzovindiflupyr 1 ppm 0.1 ppm 0 ppm 0.1 ppm 100% (97%) 99% (92%) 71%   0 ppm 88% 73%

(18) TABLE-US-00011 TABLE 11 Fluazinam Fluxapyroxad 1 ppm 0.1 ppm 0 ppm 0.1 ppm 98% (96%) 98% (88%) 42%   0 ppm 92% 78%

(19) The following will describe Formulation Examples of the present invention, but it should be understood that the amount of formulation, type of formulation, and the like in the present invention are not limited to the described examples alone.

Formulation Example 1

(20) TABLE-US-00012 (A) Kaolin 78 parts by weight (B) Condensate of sodium  2 parts by weight β-naphthalenesulfonate-formalin (C) Polyoxyethylene alkylaryl sulfate  5 parts by weight (D) Hydrated amorphous silicon dioxide 15 parts by weight

(21) A mixture of the above components, an ingredient (a), and an ingredient (b) are mixed in a weight ratio of 8:1:1 to obtain a wettable powder.

Formulation Example 2

(22) TABLE-US-00013 (A) Ingredient (a) 0.5 part by weight (B) Ingredient (b) 0.5 part by weight (C) Bentonite  20 parts by weight (D) Kaolin  74 parts by weight (E) Sodium lignin sulfonate   5 parts by weight

(23) To the above components, a suitable amount of water required for granulation is added, followed by mixing and granulation to obtain granules.

Formulation Example 3

(24) TABLE-US-00014 (A) Ingredient (a)  2 part by weight (B) Ingredient (b)  3 part by weight (C) Talc 95 parts by weight

(25) The above ingredients are uniformly mixed to obtain a dust.

(26) While the present invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. The present application is based on Japanese Patent Application No. 2015-119889 filed on Jun. 15, 2015, and the contents are incorporated herein by reference.