CN104886067B - Bactericidal composition containing chitosan oligosaccharide Yu succinate dehydrogenase inhibitors - Google Patents

Abstract

The invention belongs to plant protection art; it is related to a kind of bactericidal composition containing chitosan oligosaccharide Yu succinate dehydrogenase inhibitors; succinate dehydrogenase inhibitors component in said composition is the one kind in furametpyr, biphenyl pyrrole bacterium amine, fluopyram, isopyrazam, ring benzene pyrrole bacterium amine, and chitosan oligosaccharide is 1 with the quality parts ratio of succinate dehydrogenase inhibitors:10‑5:1, both quality sums account for the 1 80% of composition gross mass, and composition is applied to ground or the under ground portion of crop by spraying, pouring root or seed dressing, can prevent and treat the multiple diseases such as wheat scab, bakanae disease of rice.

Description

Bactericidal composition containing chitosan oligosaccharide and succinate dehydrogenase inhibitor

technical field

The invention relates to the field of plant protection, and relates to a fungicidal composition containing oligochitosan and succinate dehydrogenase inhibitor (SDHI), which is used to prevent and treat various diseases on plants in agriculture, forestry or animal husbandry, especially It has special effects on diseases of cereals.

Background technique

The action mechanism of SDHI (succinate dehydrogenase inhibitors) fungicides is mainly to inhibit the activity of succinate dehydrogenase of pathogenic bacteria, thereby interfering with their respiration. Such fungicides that have been successfully developed so far mainly include furametpyr, bixafen, fluopyram, isopyrazam, and cycloxafen. (sedaxane).

In order to reasonably protect agents, delay the emergence of bacteria resistance to new agents, and improve the control effect of agents, it is necessary to carry out reasonable compound research. The present invention finds through experiments that the bactericidal combination of chitosan oligosaccharide and the above-mentioned succinate dehydrogenase inhibitor (SDHI) has unexpected technical effects.

Contents of the invention

The object of the present invention is to provide a bactericidal composition containing chitosan oligosaccharide and succinate dehydrogenase inhibitor (SDHI) with better effect. Combining two different structures is an effective way to expand the control spectrum and improve drug efficacy, and more importantly, to avoid or delay the emergence of disease resistance to new ingredients. The object of the present invention is achieved by the following measures.

The invention provides a bactericidal composition containing chitosan oligosaccharide and a succinate dehydrogenase inhibitor, characterized in that the succinate dehydrogenase inhibitor component in the composition is furamet, bixen, One of fluopyram, pyraclostrobin, and cyclofluxen, the ratio of mass and number of chitosan oligosaccharides to succinate dehydrogenase inhibitors is 1:10-5:1, preferably, the shell The ratio of oligosaccharide to succinate dehydrogenase inhibitor in parts by mass is 1:4-4:1.

In the above composition of the present invention, the sum of the mass of component A and component B accounts for 1-80% of the total mass of the composition.

The above-mentioned composition of the present invention can be made into aqueous agent, suspension agent, wettable powder, water dispersible granule, microemulsion or aqueous emulsion.

The present invention also provides a method for controlling crop diseases with the above composition, which is characterized in that the composition is applied to the aboveground or underground parts of the crops by spraying, root irrigation or seed dressing.

The present invention also provides the use of the above composition for preventing and controlling various agricultural diseases of plants, characterized in that the diseases are head blight, powdery mildew, leaf spot, etc. Bakanae disease, scab, etc. caused by fungi, rust, smut, etc. caused by Basidiomycotina, wheat bush dwarf disease, corn dwarf disease, rice black-streaked dwarf disease, etc. caused by viral diseases. Preferably, the diseases are scab, powdery mildew, leaf spot, etc. caused by Ascomycotina fungi, bakanae disease, scab, etc. caused by Deuteromycota fungi, rust, Smut etc., further preferably, said disease is wheat head blight, rice bakanae disease.

The beneficial effects of the present invention are:

1. Obvious synergistic effect: the composition exhibits good synergistic effect within a certain proportion range, which improves the disease prevention effect of the composition.

2. Reduce the cost of use: because the compound can improve the control effect and increase the control spectrum, the number of uses is reduced, and the cost of use is reduced;

3. Delaying drug resistance: The combination of two ingredients with different mechanisms of action makes it difficult for pathogenic bacteria to develop drug resistance and delays the emergence of pathogens' resistance to a single drug.

detailed description

The following examples are further descriptions of the present invention, but the present invention is not limited only to the compositions and uses in this embodiment.

The control effect of embodiment 1 composition to wheat head blight

A field test of wheat head blight was carried out with the composition, and a corresponding single dose and a blank control ^were set up. A knapsack sprayer was used for conventional constant spraying. The test was sprayed once at the early stage of flowering, and the second spray was carried out 7-10 days after the first spraying. Sampling was carried out at five points on the diagonal, 80 plants at each point, graded according to the percentage of dead ear area in the whole ear area, and recorded the number of diseased ears and the total number of ears at each level.

Grading method:

Level 0: Whole ears are disease-free

Grade 1: The dead ear area accounts for less than 1/4 of the whole ear area;

Grade 3: The dead ear area accounts for 1/4~1/2 of the whole ear area;

Grade 5: The dead ear area accounts for 1/2 to 3/4 of the whole ear area;

Grade 7: The dead ear area accounts for more than 3/4 of the whole ear area;

In the theoretical effect, x is the effect of substance A when the concentration is a, y is the effect of substance B when the concentration is b, compare the theoretical effect and actual effect, and evaluate the synergistic effect of the composition, so that the actual control effect is greater than the theoretical control effect time for synergy. The control effect of the composition on wheat head blight is shown in Table 1.

The control effect of table 1 composition to wheat head blight

By chitosan oligosaccharide composition test to wheat head blight found that when composition ratio is 1:4 and 4:1, the composition of chitosan oligosaccharide and furamet, the composition of chitosan oligosaccharide and bixafen The composition of the composition, the composition of oligochitosan and fluopyram, the composition of oligochitosan and pyraclostrobin and the composition of oligochitosan and cyclofluxam have high effects on wheat head blight The theoretical control effect of the corresponding composition. It can be predicted that the composition of chitosan oligosaccharide and the above-mentioned fungicidal compound is synergistic against wheat head blight when the ratio is 1:4-4:1.

The effect of embodiment 2 compositions on rice bakanae disease

According to the plan, compound preparations and single-dose preparations are processed and prepared, and each medicine is prepared into a suspension, and a pre-test of the activity of the medicine is carried out. According to the pre-test of activity determination, the preparation is formulated into the required concentration. Select the paddy field with the disease, and use the medicament to dress the rice seeds (the concentration is calculated as the effective milligram of the medicament per kilogram of seeds), sow and raise seedlings. When the blank control rice bakanae disease occurred, the investigation began, and each treatment was sampled at five points on the diagonal, 80 plants at each point, and the rate of diseased plants was determined. Convert percentages to efficacy using Abbot's formula.

In the theoretical effect, x is the effect of substance A when the concentration is a, y is the effect of substance B when the concentration is b, compare the theoretical effect and actual effect, and evaluate the synergistic effect of the composition, so that the actual control effect is greater than the theoretical control effect time for synergy. The control effect of the composition on rice bakanae disease is shown in Table 2.

Field effect of table 2 composition on rice bakanae disease

Through the composition test on rice bakanae disease, it is found that when the above-mentioned composition is at a ratio of 1:10 and 2.5:1, the composition of oligochitosan and furamet, the combination of oligochitosan and bixafen Compounds, the composition of oligochitosan and fluopyram, the composition of oligochitosan and pyraclostrobin, and the composition of oligochitosan and cycloflufen have higher effects on rice bakanae disease than the combination Theoretical anti-efficacy of substances. It can be predicted that the composition of chitosan oligosaccharide and the above-mentioned fungicidal compound has a synergistic effect on rice bakanae disease when the ratio is 1:10-2.5:1.

Claims (8)

1. the bactericidal composition containing chitosan oligosaccharide Yu succinate dehydrogenase inhibitors, it is characterised in that the amber in said composition Dehydrogenase inhibitor component is the one kind in biphenyl pyrrole bacterium amine, isopyrazam, ring benzene pyrrole bacterium amine, chitosan oligosaccharide and the butanedioic acid The quality parts ratio of dehydrogenase inhibitor is 1:10-5:1.

2. composition according to claim 1, it is characterised in that the quality parts ratio of chitosan oligosaccharide and succinate dehydrogenase inhibitors It is 1:4-4:1.

3. according to the composition of claim 1 or 2, it is characterised in that the quality of chitosan oligosaccharide and succinate dehydrogenase inhibitors it With the 1-80% for accounting for composition gross mass.

4. composition according to claim 3, it is characterised in that composition is made aqua, suspending agent, wettable powder, moisture Shot agent, microemulsion or aqueous emulsion.

5. the composition of claim 4 is used for the method for preventing and treating crop disease, it is characterised in that by composition by spraying, filling Root or seed dressing are applied to ground or the under ground portion of crop.

6. the composition of claim 4 is used for the purposes of the multiple diseases for preventing and treating plant, it is characterised in that the disease is ascus Head blight, powdery mildew, leaf spot that bacterium subphylum fungi causes, the fungus-caused bakanae disease of Fungi Imperfecti, scab, basidiomycetes are sub- Rust, smut that door causes, wheat rosette stunt, Maize Dwarf disease, black streaked dwarf virus of rice that virosis causes.

7. purposes according to claim 6, it is characterised in that the disease is the fungus-caused head blight of Ascomycotina, white Powder disease, leaf spot, the fungus-caused bakanae disease of Fungi Imperfecti, scab, rust, smut that Basidiomycotina causes.

8. purposes according to claim 7, it is characterised in that the disease is wheat scab, bakanae disease of rice.