A pre-emergence herbicide for sesame fields containing isoproturon and flumioxazin

Abstract

The present invention belongs to the technical field of herbicides, and particularly relates to a pre-emergence herbicide for sesame fields containing isoproturon and flumioxazin. A pre-emergence herbicide for sesame fields, wherein the pre-emergence herbicide for sesame fields is prepared from active ingredients supplemented with auxiliary ingredients permitted to be added in pesticide science; wherein, the active ingredients are compounded by isoproturon and flumioxazin according to a mass ratio of 1-30:15-1, or are compounded by isoproturon, flumioxazin and metolachlor according to a mass ratio of 1:1-20:8-1. The herbicide compounded by isoproturon and flumioxazin in the present invention, or the herbicide compounded by isoproturon, flumioxazin and metolachlor, has a co-toxicity coefficient greater than 120 within a certain mass ratio range, shows a synergistic effect on the weed Abutilon theophrasti in sesame fields, can improve the control effect on weeds such as Abutilon theophrasti in sesame fields, and at the same time can delay the generation of weed resistance and reduce the resistance risk of herbicides, and can be used for developing new high-efficiency herbicides.

Description

Technical Field

[0001] The present invention belongs to the technical field of herbicides, and particularly relates to a pre-emergence herbicide for sesame fields containing isoproturon and flumioxazin. Background Art

[0002] Sesame (scientific name: Sesamum indicum L.) is an annual herbaceous plant of the Pedaliaceae family. The oil content of sesame seeds can reach 55%. In addition to being used for food, it can also be used for oil extraction. The oil is used for food and for women to apply to their hair, and it can also be used medicinally as an ointment base, emollient, and antidote. There are two types of sesame seeds, black and white, which correspond to black sesame and white sesame respectively. Among them, black sesame contains a mild nourishing and strengthening agent of fatty oil, which has the effect of moisturizing and nourishing, and also has a therapeutic effect on hypertension. During the sesame planting process, weeds such as Portulaca oleracea, Abutilon theophrasti, and Celosia argentea will compete with sesame for resources such as water, light, and fertilizer, affecting the yield of sesame.

[0003] At present, chemical agents are mainly used to control weeds in sesame fields. Although chemical herbicides have the advantages of convenient application and quick effect, they are also prone to the generation of weed resistance. With the gradual accumulation of weed resistance, the control effect of chemical herbicides gradually decreases or even fails. Therefore, it is necessary to develop new and highly effective herbicides.

[0004] Isoproturon is an inhibitor of photosynthetic electron transport, belonging to the selective pre-emergence and post-emergence herbicides of the substituted urea type, and also having selective systemic activity. Isoproturon is mainly absorbed by the roots and stems and leaves of weeds, and is conducted upward with water in the ducts to the leaves, mostly distributed at the leaf tips and margins, and plays a role in green cells, interfering with the progress of photosynthesis. Under light, oxygen and carbon dioxide cannot be released, and the growth of organic matter stops, and sensitive weeds die of starvation.

[0005] Flumioxazin is a cyclic imide herbicide, a protoporphyrinogen oxidase inhibitor, and a contact-type selective herbicide. After treating the soil surface with flumioxazin, the agent is absorbed by soil particles and forms a treatment layer on the soil surface. When weeds germinate, the seedlings come into contact with the agent treatment layer and die. When the stems and leaves are treated, it can be absorbed by the young stems and leaves of plants and conducted in the plants. It acts quickly on the leaves of sensitive weeds, causing the accumulation of protoporphyrin, enhancing the lipid peroxidation of cell membranes, and thus leading to irreversible damage to the cell membrane structure and cell function of sensitive weeds. The weeds wither, turn white, and then die of necrosis.

[0006] Metolachlor is a chloroacetamide herbicide that mainly inhibits cell growth by hindering protein synthesis. Metolachlor is absorbed through the young buds of plants, namely the coleoptile of monocotyledonous plants and the hypocotyl of dicotyledonous plants, and is conducted upward. It can also be absorbed and conducted by the roots, leaves, and seeds, but the absorption amount is less and the conduction speed is slow. After emergence, it is mainly absorbed by the roots and conducted upward, inhibiting the growth of young buds and roots. Sensitive weeds will be poisoned and die immediately before or just after emerging from the soil after germination.

[0007] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0008] The object of the present invention is to provide a pre-emergence herbicide for sesame fields containing isoproturon and flumioxazin, which can improve the control effect on weeds such as Portulaca oleracea, Abutilon theophrasti, and Celosia argentea in sesame fields.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A pre-emergence herbicide for sesame fields, which is prepared by using active ingredients supplemented with auxiliary ingredients permitted in pesticide science; wherein, the active ingredients are compounded by isoproturon and flumioxazin in a mass ratio of 1-30:15-1, or compounded by isoproturon, flumioxazin and metolachlor in a mass ratio of 1:1-20:8-1.

[0011] Preferably, the mass of the active ingredients accounts for 0.5-80% of the mass of the pre-emergence herbicide for sesame fields.

[0012] Preferably, the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, disintegrants, binders, antifreeze agents, defoaming agents, colorants, preservatives, synergists, safeners, and inert carriers.

[0013] The present invention also provides the application of the pre-emergence herbicide for sesame fields in controlling weeds in sesame fields.

[0014] Preferably, the weeds in sesame fields include Portulaca oleracea, Abutilon theophrasti, and Celosia argentea.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The herbicide formed by compounding isoproturon and fluazifop-propyl, or the herbicide formed by compounding isoproturon, fluazifop-propyl and metolachlor, has a co-toxicity coefficient greater than 120 within a certain mass ratio range, exhibits a synergistic effect on sesame field weeds such as chrysanthemum, and can improve the control effect on sesame field weeds such as chrysanthemum, while delaying the development of weed resistance and reducing the risk of herbicide resistance. The herbicide can be used to develop new and highly effective herbicides. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solution of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts are within the scope of protection of the present invention.

[0018] Embodiment :Indoor biological activity test

[0019] 1. Test weeds

[0020] Chrysanthemum vulgare (Abutilon theophrasti): Seeds collected from Qiaobei Township, Yuanyang County, Henan Province

[0021] 2. Test agents

[0022] 97% isoproturon technical, 99.2% fluazifop-propyl technical and 96% isopropylamine technical, all of the above agents come from the laboratory of the Institute of Plant Protection, Henan Academy of Agricultural Sciences.

[0023] The above test agents were completely dissolved in dimethyl sulfoxide and diluted with 0.1% Tween-80 aqueous solution to form a single-dose stock solution; then, multiple groups of mixed preparations were set up, and each single agent and mixed preparation was further diluted with 0.1% Tween-80 aqueous solution to form 5 mass concentration gradients. The above agents were prepared and used immediately.

[0024] 3. Test method: (Refer to "NY / T 1155.3-2006 Pesticide Indoor Bioassay Test Guidelines Herbicides Part 3: Activity Determination Test Soil Spray Method")

[0025] 3.1 Planting of test weeds

[0026] Soil from the experimental fields of the Henan Academy of Agricultural Sciences was dried in the shade and passed through a 1.19 mm sieve. Peat and vermiculite were added at a mass ratio of 3:1:1 soil: peat: vermiculite. After mixing thoroughly, the mixture was metered in at the 4 / 5 mark of a pot (8.5 cm diameter, 8.2 cm height). Water was absorbed through the bottom of the pot until the soil was completely moistened. Germinated chrysanthemum seeds were evenly sown on the soil surface at a rate of 20 seeds per pot, covered with 0.5 cm of fine soil, and treated with the pesticide 12 hours later.

[0027] 3.2 Chemical agent treatment

[0028] Use a 3WP-2000 walking spray tower for soil spraying treatment, with a TP6501 type fan-shaped nozzle, a spraying height of 300 mm, and a spraying pressure of 2 kg / m 2 , the flow rate of the conical spray head is 100 mL / min, and the liquid medicine volume is 450 L / hm 2 . Set 4 replicates for each treatment, and set a 0.1% Tween-80 aqueous solution treatment as a blank control. Incubate under the conditions of a temperature of 25°C and a relative humidity of 45%.

[0029] 3.4 Investigation and calculation

[0030] After the treatment, regularly observe the emergence of weeds and their growth status after emergence by visual inspection. Weigh the fresh weight of the above-ground parts of the weeds 14 days after applying the medicine, calculate the control effect of the fresh weight, and then use DPS software to conduct a regression analysis on the logarithm of the chemical agent dose and the probit value of the control effect of the fresh weight, and calculate the ED 50 of each single agent and different ratio mixtures, and calculate the co-toxicity coefficient (CTC value) of the mixture according to Sun Yunpei's method.

[0031]

[0032] In the above formula: E--control effect of fresh weight (%); C--fresh weight of the above-ground parts of the control weeds (g); T--fresh weight of the above-ground parts of the treated weeds (g).

[0033] 4. Evaluation of chemical agents

[0034] Evaluate the synergistic effect of chemical agent mixtures according to the co-toxicity coefficient (CTC), that is, CTC≤80 is antagonistic effect, 80<CTC<120 is additive effect, and CTC≥120 is synergistic effect. The results are shown in Table 1-2.

[0035] Table 1 Results of toxicity determination of the compound of isoproturon and flumioxazin on Abutilon theophrasti

[0036]

[0037]

[0038] As can be seen from Table 1, in the mass ratio range of 1-30:15-1, the co-toxicity coefficient of the compound of isoproturon and flumioxazin on Abutilon theophrasti is between 121.2540-393.6345, all greater than 120, indicating that the compound of isoproturon and flumioxazin shows a synergistic effect on Abutilon theophrasti.

[0039] Table 2 Results of toxicity determination of the compound of isoproturon, flumioxazin and metolachlor on Abutilon theophrasti

[0040]

[0041] As can be seen from Table 2, within the mass ratio range of 1:1 - 20:8 - 1, only when the mass ratio of the three is 1:1:1, the co-toxicity coefficient is 118.4430, which is between 80 and 120, showing an additive effect; the co-toxicity coefficients of the other formulations are all greater than 120, indicating that the compound of isoproturon, flumioxazin and metolachlor shows a synergistic effect on Abutilon theophrasti, especially when the mass ratio is 1:10:1, the co-toxicity coefficient reaches 253.0634, and the synergistic effect is particularly significant.

[0042] In summary, the herbicide composed of the compound of isoproturon and flumioxazin, or the compound of isoproturon, flumioxazin and metolachlor in the present invention has a co-toxicity coefficient greater than 120 within a certain mass ratio range, showing a synergistic effect, which can improve the control effect on weeds such as Abutilon theophrasti in sesame fields, and at the same time can delay the generation of weed resistance, reduce the resistance risk of herbicides, and can be used to develop new high-efficiency herbicides.

[0043] The foregoing description of the specific exemplary embodiments of the present invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is apparent that many changes and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present invention, as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. Application of a closed herbicide for sesame fields in the closed control of weeds in sesame fields, characterized in that, The sesame field pre-emergence herbicide is prepared from active ingredients supplemented with auxiliary ingredients permitted in pesticide science; among them, the active ingredients are compounded by isoproturon and flumioxazin in a mass ratio of 1-30:15-1, or are compounded by isoproturon, flumioxazin and metolachlor in a mass ratio of 1:1-20:8-1.

2. The application according to claim 1, characterized in that The mass of the active ingredients accounts for 0.5-80% of the mass of the sesame field pre-emergence herbicide.

3. The application according to claim 1, wherein The auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, disintegrants, binders, antifreezing agents, defoaming agents, colorants, preservatives, synergists, safeners and inert carriers.

4. The application according to claim 1, characterized in that, The sesame field weeds include Portulaca oleracea, Abutilon theophrasti and Celosia argentea.

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