CN101810202B - Microbial weeding oil flowable concentrate for rice field - Google Patents

Abstract

The invention discloses a microbial weeding oil flowable concentrate for rice field, which is characterized by taking Curvularia lunata (Wakker) Boedijn B6 with the preservation number of CGMGG No. 2928 as an effective component, being complemented by suitable solvent, surfactant, thickener and stabilizer, and then preparing a suspension system after mechanical grinding, wherein the effective component is (0.1-10)*108 spores/ml, the mass percentage of the surfactant is 1-10, the mass percentage of the stabilizer is 1-10, the mass percentage of the thickener is 0.1-5, and the solvent is filled in to 100 percent; the oil-based suspension is used for preventing and weeding barnyard grass in the rice field and is safe for the rice, and can control the barnyard grass of a whole rice growth period by using the microbial weeding oil-based suspension once; and the invention provides a novel formulation of an effective post-sprout microbial herbicide with stable storage, and the microbial weeding oil flowable concentrate is environmental-friendly, prevents and weeds the barnyard grass in the rice field and increases the yield obviously.

Description

Oil suspension concentrate for microbial weed control in paddy fields

technical field

The invention relates to a novel microbial herbicide, in particular to an oil suspension concentrate of a fungal herbicide, and belongs to the field of agricultural chemicals.

Background technique

Curvularia crescens B6 (preservation number CGMCC No.2928) is a newly developed herbicide fungus. After a large number of experimental studies, it has shown that it has high biological activity against barnyardgrass in paddy fields, and it has anti-weeding properties when used in paddy fields. It has the characteristics of high efficiency, safety to the ecological environment of rice fields, no residual toxicity, no phytotoxicity, and obvious increase in yield. At present, the main dosage forms of microbial pesticides are water preparations and wettable powders. The water preparations contain low active ingredients, and the amount in the process of packaging, transportation, and use is large, and the cost of use is high; although the wettable powders have high active ingredients, they are more expensive. There are dust drift problems during processing, packaging, and use, and the active ingredient is degraded by the acidity or alkalinity of the carrier surface during storage. Oil suspension concentrate is a highly dispersed and stable suspension system formed by dispersing active ingredients in oil phase medium. Compared with water and wettable powders, oil suspension concentrates have stronger penetration and adhesion to target crops, so they have a synergistic effect. Since the former uses inert mineral oil and vegetable oil, the active ingredients are stable during storage.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies and defects in the prior art, to provide a kind of paddy field microbial herbicide oil suspension concentrate with good storage stability, so that it can effectively control paddy field barnyard grass, thereby saving manpower and material resources, reducing the cost of using chemicals due to a large number of Pesticides pollute the environment and harm the human body to achieve the purpose of increasing production and income.

The present invention is achieved through the following technical solutions, Curvularia lunata B6 oil suspension concentrate is made up of Curvularia lunata, solvent, surfactant, stabilizer, thickener etc., and each component is formed as follows:

Active ingredient (0.1-10)× ¹⁰⁸ spores/ml Surfactant 1-10%

Stabilizer 1-10% Thickener 0.1-5%

Solvent fill up to 100%

The active ingredient is Curvularia lunata B6, its preservation number is CGMCC No.2928, and its concentration is (0.1-10)×10 ⁸ spores/ml.

The solvent includes vegetable oil and mineral oil, which can be one or more mixtures of peanut oil, soybean oil, palm oil, rapeseed oil, rice bran oil, sunflower oil, sesame oil, castor oil, tung oil, diesel oil, motor oil, and kerosene .

The surfactant includes one or more mixtures of anionic, cationic and nonionic surfactants. Described thickener comprises one of kaolin, bentonite, attapulgite, sepiolite, white carbon black, diatomaceous earth, light calcium carbonate, talcum powder, plaster of paris, chalk, clay, montmorillonite, clay species or a mixture of several.

The stabilizer includes one or more mixtures of sucrose, urea, alginic acid, ethylene glycol, propylene glycol and glycerin.

The present invention has the following characteristics:

1. It has good control effect on barnyardgrass in paddy fields.

2. Non-toxic to humans and animals, safe to natural enemies of pests, and does not pollute the environment.

3. There is no dust drift in the process of production, processing and use, and there is no agglomeration or moisture absorption in the process of transportation and storage.

4. Strong permeability and adhesion, anti-evaporation, rain-resistant, long-lasting, storage-resistant, safe for crops, and obvious increase in production.

Indoor and field tests have proved that the present invention can be used to control barnyardgrass in paddy fields, is safe for rice, has a wide herbicidal spectrum, and can control barnyardgrass in the whole growth period of rice with one application of medicine. During the period, it is diluted with water for 200-1000 times and sprayed evenly. The invention provides a new formulation variety of an excellent post-emergent microbial herbicide, which is stable during storage, friendly to the environment and significantly increases production.

Detailed ways

The following embodiments are provided in conjunction with the specific content of the present invention:

Embodiment 1. Curvularia lunata mold B6 (Curvularia lunata) 6 × ¹⁰ spores/ml, calcium dodecylbenzenesulfonate 2g, nonylphenol polyoxyethylene ether (n=20) 6g, urea 2g, White carbon black 0.2g, make up to 100ml with deodorized kerosene, put it into a sand mill and grind for 5 hours, so that its average particle size is about 4 μm, and then 100ml of oil suspension product is obtained. According to the relevant standards of FAO, the cold, The thermal storage stability is qualified, and the dose of 50ml/mu is mixed with 30 kg of water when the two leaves of the barnyardgrass are applied in the rice transplanting field. After 30 days, the control rate of the fresh weight of the barnyardgrass is 93.8%.

Example 2. Curvularia lunata B6 (Curvularia lunata) 2 × 10 ⁸ spores/ml, calcium lignosulfonate 2g, castor oil polyoxyethylene ether (n=15) 2g, sepiolite 5g, alginic acid 1g, filled with peanut oil to 100ml, put it into a ball mill and grind it for 4 hours, so that the average particle size is about 4μm, and then 100ml of oil suspension product is obtained. According to the relevant standards of FAO, the cold and hot storage stability of this preparation is qualified. 150ml/mu dosage mixed with 30kg of water was applied when two leaves were united in the paddy seedling throwing field, and the fresh weight control rate of weeds was 96.5% after 30 days.

Example 3. Curvularia lunata B6 (Curvularia lunata) 0.3 × ¹⁰⁸ spores/ml, sodium salt (NNO) 3g of naphthalenesulfonic acid formaldehyde condensate, castor oil polyoxyethylene ether (n=15) 5g, 1g of clay, 1g of sucrose, and 100ml of palm oil are put into a sand mill and ground for 3 hours, so that the average particle size is about 4μm, and 100ml of oil suspension product is obtained. According to the relevant standards of FAO, the cold and hot The storage stability is qualified, and the dosage of 750ml/mu is mixed with 30 kilograms of water in the rice seedling field at the three-leaf stage. After 30 days, the fresh weight control rate of weeds is 91.6%.

Claims (7)

1. the oil-suspending agent of paddy field microorganism weeding; It is characterized in that with the preserving number being that the curvularia lunata bacterium B6 (Curvularia lunata) of CGMCC No.2928 is for active ingredient; And be aided with appropriate solvent, surfactant, thickener, stabilizing agent; Through the suspension system that mechanical lapping is prepared into, wherein the concentration of curvularia lunata bacterium B6 is (0.1-10) * 10 ⁸Individual spore/ml, the surfactant mass percent is 1-10%, and the stabilizing agent mass percent is 1-10%, and thickener qualities percentage is 0.1-5%, solvent polishing to 100%.

2. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that used active ingredient is curvularia lunata bacterium B6 (Curvularia lunata), and its deposit number is CGMCC No.2928, and its concentration is (0.1-10) * 10 ⁸Individual spore/ml.

3. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that solvent for use comprises one or more mixtures in peanut oil, soybean oil, palm oil, rapeseed oil, cottonseed oil, rice bran oil, sunflower oil, sesame oil, castor oil, tung oil, diesel oil, machine oil, the kerosene.

4. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that used thickener comprises one or more the mixture in kaolin, bentonite, atlapulgite, sepiolite, white carbon black, diatomite, precipitated calcium carbonate, talcum powder, the plaster of paris, chalky soil, potter's clay, imvite, the clay.

5. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that used surfactant comprises one or more the mixture in anion, cation, the nonionic surfactant.

6. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that used stabilizing agent comprises one or more mixtures in sucrose, urea, alginic acid, ethylene glycol, propane diols, the glycerine.

7. the oil-suspending agent of paddy field microorganism according to claim 1 weeding is characterized in that the production and processing mode that adopts is one or more in sand milling, colloid mill, ball milling, high-speed stirred shearing, the homogeneous homogenate.