阅读说明：本技术 一种含有亚硒酸钠和甲基硫菌灵的杀菌组合物 (Bactericidal composition containing sodium selenite and thiophanate-methyl ) 是由 许大凤 王文凤 王俊 周本国 于 2020-05-08 设计创作，主要内容包括：本发明提供一种含有亚硒酸钠和甲基硫菌灵的杀菌组合物,活性成分包含亚硒酸钠和甲基硫菌灵,甲基硫菌灵和亚硒酸钠的重量配比为4:1-1:4；本发明的组合物可用于烟草病害的防治。(The invention provides a bactericidal composition containing sodium selenite and thiophanate-methyl, wherein the active ingredients comprise sodium selenite and thiophanate-methyl, and the weight ratio of the thiophanate-methyl to the sodium selenite is 4:1-1: 4; the composition can be used for preventing and treating tobacco diseases.)

1. A sterilization composition containing sodium selenite and thiophanate-methyl is characterized in that active ingredients comprise sodium selenite and thiophanate-methyl, and the weight ratio of the thiophanate-methyl to the sodium selenite is 4:1-1: 4.

2. The bactericidal composition of claim 1, wherein the weight ratio of thiophanate methyl to sodium selenite is 3:2, 1:1, or 4: 1.

3. The bactericidal composition of any one of claims 1-2, further comprising agriculturally acceptable adjuvants, wherein the active ingredients are present in an amount ranging from 5% to 50% by weight.

4. The bactericidal composition of claim 3, wherein the adjuvants comprise one or more of dispersants, emulsifiers, disintegrants, stabilizers, antifreezes, wetting agents, synergists, penetrants, preservatives, fillers, and solvents.

5. The germicidal composition of claim 4, wherein: the dosage form which can be prepared by the composition is wettable powder, water dispersible granules, granules and aqueous emulsion.

6. Use of the fungicidal composition according to any one of claims 1 to 5 for controlling tobacco diseases.

7. Use according to claim 6, characterized by being used for the control of tobacco root rot.

Technical Field

The invention belongs to the field of agricultural chemistry, and particularly relates to a bactericidal composition containing sodium selenite and thiophanate-methyl.

Background

Tobacco root black rot is a soil-borne disease caused by rhizobium rhizogenes Thielaviopsis basicola (Berk. and Br.) Ferraris, and the disease occurs in all tobacco regions in China. In recent years, the black rot of tobacco roots tends to be increased due to adjustment of tobacco planting area, change of cultivation system and tobacco variety. The black rot of tobacco roots can occur from the seedling stage to the adult plant stage; mainly occurs on the root system of tobacco plants, which causes black rot symptoms of main roots and lateral roots of tobacco plants in seedling stage and field stage. The disease in the seedling stage can cause tobacco seedling to be 'damping off', but the root part is blackened, so the disease is different from the damping off. Pathogenic bacteria invade from the rootstock part, and disease spots surround the stem part for a circle, and invade upwards to the leaves and invade downwards to the lateral roots, so that the whole seedling withers, and the residual seedling without death can also see a small amount of new lateral roots growing at the base part of the young stem above the rotten root, but the development is poor. The disease of tobacco plants in the field period is caused, the leaves of the diseased plants turn yellow from bottom to top, the growth is slow, the plants are dwarfed to different degrees, the yellow leaves of the mild plants are easy to flower early, and the yellow leaves of the severe plants are withered and dead; after the diseased plant is pulled up, most or all of the root system can turn black and rot.

Carbendazim, thiophanate methyl, prochloraz, pyraclostrobin, thiram and the like are common medicaments for preventing and treating the tobacco root black rot in the field, but due to long-term use, the drug resistance of germs is increasingly serious, and the prevention effect is reduced. The chemical pesticide is used for preventing and treating the diseases and insect pests of the tobacco for a long time, on one hand, the prevention and treatment cost is high, the planting cost of tobacco growers is increased, and on the other hand, the risks of environmental pollution, tobacco pesticide residue and the like in the tobacco planting ecological area can be caused. Therefore, the research and development of novel chemical pesticides with high efficiency, low toxicity and low residue will be an important direction for the development of future pesticides.

In addition, current studies indicate that sodium selenite is applied to soil and foliage; the selenium content of the tobacco leaves can be obviously improved; the selenium element can reduce the content of tar and free radicals in cigarette smoke, inhibit tumor occurrence and effectively reduce the incidence rate of lung cancer; meanwhile, the selenium fertilizer has antagonistic action on the poison of heavy metals, thereby reducing the harm to human bodies and improving the safety of tobacco, so that the selenium fertilizer is applied to arouse the wide attention of tobacco researchers. However, there are few reports related to the effect of sodium selenite on tobacco diseases, especially tobacco root black rot. Early-stage research of research teams finds that sodium selenite has a certain prevention and treatment effect on tobacco root rot, a series of screening is carried out on mixed combinations, and the prevention and treatment effect of the compound of sodium selenite and pyraclostrobin is general; the sodium selenite and the prochloraz have an additive effect on the disease; the sodium selenite and the carbendazim are compounded to have obvious synergistic effect. The authors further screened the combination on the basis of earlier studies and selected a more excellent synergistic composition.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the following technical scheme:

a sterilization composition containing sodium selenite and thiophanate-methyl is characterized in that active ingredients comprise sodium selenite and thiophanate-methyl, and the weight ratio of the thiophanate-methyl to the sodium selenite is 4:1-1: 4. Preferably, the weight ratio of thiophanate methyl to sodium selenite is 4:1-1: 1; more preferably, the weight ratio of the thiophanate methyl to the sodium selenite is 3:2, 1:1 and 4: 1.

The bactericidal composition also comprises agriculturally acceptable auxiliaries, and the weight percentage of the active ingredients is 1-50%. Preferably 1-35%; more preferably 1 to 25%.

The auxiliary agent comprises one or more of dispersing agent, emulsifying agent, disintegrating agent, stabilizing agent, antifreezing agent, wetting agent, synergist, penetrating agent, preservative, filler and solvent.

The dosage forms which can be prepared by the composition of the invention are wettable powder, water dispersible granules, granules and aqueous emulsion.

The bactericidal composition is used for preventing and treating tobacco diseases. Preferably used for controlling the root rot of tobacco.

Compared with the prior art, the invention has the following beneficial effects:

the bactericidal composition disclosed by the invention is composed of two active ingredients with different action mechanisms, has an obvious synergistic effect after being mixed, improves the prevention and treatment effect, and is also favorable for overcoming and delaying the generation of drug resistance. The composition of the invention is mixed with pesticide to reduce the dosage, thereby reducing the cost and lightening the pollution to the environment, having good safety and meeting the safety requirement of pesticide preparations. The composition of the invention is used for preventing and treating crop diseases, and also provides trace element selenium for tobacco crops, thereby being beneficial to improving the quality of the tobacco crops.

Detailed Description

The following detailed description of specific embodiments of the present invention is provided in conjunction with examples, but it should be understood that the scope of the present invention is not limited to the specific embodiments.