Sterilization composition containing thifluzamide and fludioxonil

Abstract

The present invention provides a sterilization composition for preventing and controlling plant diseases caused by rhizoctonia, wherein the sterilization composition contains thifluzamide and fludioxonil according to a mass ratio of 20:1-1:20. The present invention provides a sterilization agent containing the sterilization composition. The sterilization agent and the sterilization composition of the present invention can be used for preventing and controlling rice sheath blight, brown patch disease, wheat sharp eyespot and vegetable drooping disease.

Description

technical field

[0001] The invention belongs to the field of pesticide compositions, in particular to a bactericidal composition containing thifuramide and fludioxonil. Background technique

[0002] Rhizoctonia (Rhizoctonia) fungi are a class of fungi that widely exist in nature. It is distributed in cultivated and non-cultivated soils all over the world, and is easily isolated from diseased plants and soils. Rhizoctonia has a wide range of hosts. This type of fungus mainly causes plant damping-off and blight , also causes sheath blight of cereal crops. In the prior art, Thifluzamide and fludioxonil are mainly used to prevent and control Rhizoctonia fungi, but the mechanism of action of the two is different.

[0003] Thifluzamide, chemical name: 2',6'-dibromo-2-methyl-4'-trifluoromethoxy-4-trifluoromethyl-1,3-thiazole-5-carboxamide , belonging to the thiazole amide fungicides, has strong systemic conductivity and long-lasting effect, and has strong systemic conductivity f...

Examples

Embodiment 1

[0023] Example 1: Indoor Toxicity Determination of Thiofuramide and Fludioxonil Compounding to Rice Sheath Blight

[0024] Test object Rice sheath blight (Rhizoctonia solani) This strain was preserved and cultivated by our laboratory.

[0025] The test method adopts mycelium block inoculation method. Choose potted rice seedlings with two leaves and one heart and the same growth, spray them and dry them naturally, and inoculate them in about 24 hours. Insert a piece of sheath blight mycelium in the center of the base of each pot of rice seedlings that have been sprayed. Basin soil and water layer contact. After inoculation, the test material was moved to a humidity box for cultivation at a temperature of 26°C and a humidity of 80-90%. The growth of rice seedlings was observed every day, and the control effect was investigated when the blank control was fully infected after 5 days. The grading standard adopts the "SOP for Biological Activity Evaluation of Created Pesticides", ...

Embodiment 2

[0037] Example 2: Indoor Toxicity Determination of Thiofuramide and Fludioxonil Compounding to Wheat Sheath Blight and Lawn Brown Spot

[0038] Test objects: Wheat sheath blight (Rhizoctonia solani) and lawn brown spot (Rhizoctonia solani) are preserved by our laboratory.

[0039]Test method: refer to the mycelium growth rate method in "Agricultural Industry Standard of the People's Republic of China NY / T1156.2-2006". Each agent is treated with 5 doses according to the content of active ingredients, and the above-mentioned pathogenic bacteria are cultivated with PDA medium. The bacteria block was moved to the center of the pre-prepared toxic PDA medium, and then cultured in a 25°C incubator, and each treatment was repeated 4 times. Depending on the growth of the CK colony, use the cross method to measure the colony diameter cm of each treatment with a caliper, and calculate the corrected inhibition percentage. Through the linear regression analysis between the probability va...

Embodiment 3

[0053] 22% Thiofuramide · Fludioxonil Suspension Concentrate: Weigh 20% Thiofuramide, 2% Fludioxonil, 3% TERSPERSE4894, 2% TERSPERSE2500, 3% TERSPERSE2425, 0.2% Xanthan Gum, 3% White Carbon Black, 5% ethylene glycol, 0.3% benzoic acid, 0.5% silicone defoamer (trade name: s-29 produced by Nanjing Sixin Applied Chemicals Company), deionized water to 100% by mass. Embodiment 3: Wettable powder—60% Thiofuramide Fludioxonil wettable powder

[0054] According to the requirements of the formula, after mixing, it is pulverized by a coarse pulverizer, and then enters a jet pulverizer to fully pulverize and mix to obtain a wettable powder.

[0055] 60% Thiofuramide · Fludioxonil WP: Weigh 40% Thiofuramide, 20% Fludioxonil, 5% Calcium Lignosulfonate, 2% Open Powder BX, 1% K-12, 5% White carbon black and kaolin are added to 100% by mass.

technical field

[0001] The invention belongs to the field of pesticide compositions, in particular to a bactericidal composition containing thifuramide and fludioxonil. Background technique

[0002] Rhizoctonia (Rhizoctonia) fungi are a class of fungi that widely exist in nature. It is distributed in cultivated and non-cultivated soils all over the world, and is easily isolated from diseased plants and soils. Rhizoctonia has a wide range of hosts. This type of fungus mainly causes plant damping-off and blight , also causes sheath blight of cereal crops. In the prior art, Thifluzamide and fludioxonil are mainly used to prevent and control Rhizoctonia fungi, but the mechanism of action of the two is different.

[0003] Thifluzamide, chemical name: 2',6'-dibromo-2-methyl-4'-trifluoromethoxy-4-trifluoromethyl-1,3-thiazole-5-carboxamide , belonging to the thiazole amide fungicides, has strong systemic conductivity and long-lasting effect, and has strong systemic conductivity f...

Examples

Embodiment 1

[0023] Example 1: Indoor Toxicity Determination of Thiofuramide and Fludioxonil Compounding to Rice Sheath Blight

[0024] Test object Rice sheath blight (Rhizoctonia solani) This strain was preserved and cultivated by our laboratory.

[0025] The test method adopts mycelium block inoculation method. Choose potted rice seedlings with two leaves and one heart and the same growth, spray them and dry them naturally, and inoculate them in about 24 hours. Insert a piece of sheath blight mycelium in the center of the base of each pot of rice seedlings that have been sprayed. Basin soil and water layer contact. After inoculation, the test material was moved to a humidity box for cultivation at a temperature of 26°C and a humidity of 80-90%. The growth of rice seedlings was observed every day, and the control effect was investigated when the blank control was fully infected after 5 days. The grading standard adopts the "SOP for Biological Activity Evaluation of Created Pesticides", ...

Embodiment 2

[0037] Example 2: Indoor Toxicity Determination of Thiofuramide and Fludioxonil Compounding to Wheat Sheath Blight and Lawn Brown Spot

[0038] Test objects: Wheat sheath blight (Rhizoctonia solani) and lawn brown spot (Rhizoctonia solani) are preserved by our laboratory.

[0039]Test method: refer to the mycelium growth rate method in "Agricultural Industry Standard of the People's Republic of China NY / T1156.2-2006". Each agent is treated with 5 doses according to the content of active ingredients, and the above-mentioned pathogenic bacteria are cultivated with PDA medium. The bacteria block was moved to the center of the pre-prepared toxic PDA medium, and then cultured in a 25°C incubator, and each treatment was repeated 4 times. Depending on the growth of the CK colony, use the cross method to measure the colony diameter cm of each treatment with a caliper, and calculate the corrected inhibition percentage. Through the linear regression analysis between the probability va...

Embodiment 3

[0053] 22% Thiofuramide · Fludioxonil Suspension Concentrate: Weigh 20% Thiofuramide, 2% Fludioxonil, 3% TERSPERSE4894, 2% TERSPERSE2500, 3% TERSPERSE2425, 0.2% Xanthan Gum, 3% White Carbon Black, 5% ethylene glycol, 0.3% benzoic acid, 0.5% silicone defoamer (trade name: s-29 produced by Nanjing Sixin Applied Chemicals Company), deionized water to 100% by mass. Embodiment 3: Wettable powder—60% Thiofuramide Fludioxonil wettable powder

[0054] According to the requirements of the formula, after mixing, it is pulverized by a coarse pulverizer, and then enters a jet pulverizer to fully pulverize and mix to obtain a wettable powder.

[0055] 60% Thiofuramide · Fludioxonil WP: Weigh 40% Thiofuramide, 20% Fludioxonil, 5% Calcium Lignosulfonate, 2% Open Powder BX, 1% K-12, 5% White carbon black and kaolin are added to 100% by mass.

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