Efficient weeding composition for broadleaf weeds in airport lawns and application of efficient weeding composition

Abstract

The invention belongs to the technical field of herbicides, and particularly relates to an efficient weeding composition for airport lawn broadleaf weeds and application thereof.The efficient weeding composition is prepared from carfentrazone-ethyl, chipton sodium, fluroxypyr-mepthyl and 2, 4-D isooctyl ester as main effective components, by matching with a special auxiliary agent composed of xanthan gum, polyethylene glycol and the like and a pesticide application method matched with an airport scene, efficient prevention and control of rumex plicata broadleaf weed plants are achieved, and the weeding composition is safe, free of phytotoxicity and low in soil residue on common airport turfgrass such as cynodon dactylon, bluegrass, agrostis pilosa and festuca arundinacea. The device can cut off a grass-insect-bird ecological chain of an airport, remarkably reduces the bird strike risk, is suitable for lawns of various airport flying areas, and has extremely high popularization value.

Description

Technical Field

[0001] This invention belongs to the field of herbicide technology, specifically relating to a highly efficient herbicidal composition for broadleaf weeds in airport lawns and its application. Background Technology

[0002] Airport flight area lawns, as crucial infrastructure for ensuring flight safety, not only need to provide pilots with stable visual references but also require ecological regulation to reduce bird activity—bird collisions with aircraft directly threaten flight safety, causing significant economic losses and the risk of personal injury. Existing research indicates that broadleaf weeds are one of the key factors inducing bird activity at airports. On the one hand, broadleaf weeds compete with turfgrass for water, nutrients, and sunlight, leading to lawn degradation and impairing the visual navigation function of the flight area; on the other hand, broadleaf weeds provide nesting habitats and insect food sources for birds, forming a "grass-insect-bird" ecological chain, significantly increasing the frequency of bird stays in the flight area.

[0003] Currently, while broadleaf weed control is widely implemented at domestic airports, two core problems exist: First, there is a lack of targeted herbicide selection. Most airports use general-purpose herbicides (such as single-herbicides like 2,4-D isooctyl ester and cyclohexane), resulting in inconsistent efficacy against the dominant broadleaf weed, *Rumex rubra*. Some herbicides even cause lawn damage due to poor selectivity. Second, it is difficult to balance efficacy with ecological safety. While high-dose single-herbicide control can achieve short-term weed control, it easily leads to soil residues and environmental pollution, contradicting the concept of ecological governance at airports. Although airports have attempted to supplement weed control with lawn mowing and manual weeding, these methods are labor-intensive, inefficient, and fail to fundamentally break the "weed-insect-bird" chain. While some airports have proposed ecological bird control concepts, they have not yet developed a widely applicable targeted herbicide combination program.

[0004] Due to its strong reproductive capacity and significant herbicide resistance, *Rumex rubra* has become the dominant broadleaf weed species on the lawn of Changzhi Airport. *Rumex rubra* has a well-developed root system that efficiently absorbs herbicides from the soil and secretes some of the absorbed herbicides into the subsoil. This results in the actual herbicide concentration within the plant being insufficient to reach the root-killing concentration, leading to a phenomenon where "the above-ground parts are damaged while the underground parts survive." Furthermore, the active rhizosphere environment of *Rumex rubra* promotes the colonization of functional microorganisms through its root exudates, further reducing the effective herbicide concentration within the plant and exacerbating the discrepancy between apparent herbicide damage symptoms and actual control effectiveness. Current herbicides lack effective control strategies against *Rumex rubra*, necessitating the development of targeted herbicide combinations to achieve the synergistic goals of weed control, bird control, and ecological security. Summary of the Invention

[0005] To address the problem that existing herbicides are ineffective at completely eradicating the roots of *Rumex rubra*, and that regrowth occurs after application even when the herbicide causes damage, resulting in poor control efficacy, this invention provides a highly efficient herbicidal composition and its application for controlling broadleaf weeds in airport lawns, particularly *Rumex rubra*, exhibiting strong targeting, long-lasting efficacy, low toxicity, and environmental friendliness. The technical solution is as follows: A highly efficient herbicidal composition for broadleaf weeds in airport lawns, comprising the following components by weight: 1-2 parts of cyclohexane, 28-56 parts of sodium 2,4-D, 15-30 parts of isooctyl fluchlorpyrifos, and 5-15 parts of 2,4-D isooctyl ester.

[0006] Furthermore, by weight, it includes the following components: 10-20 parts of 10% cyclohexane, 50-100 parts of 56% sodium 2,4-D, 50-100 parts of 30% isooctyl fluoride, and 10-30 parts of 50% 2-4D isooctyl fluoride.

[0007] Furthermore, it can be a combination of individual components and / or compound agents.

[0008] A herbicide comprising the above-described composition, comprising the composition and adjuvants.

[0009] Furthermore, the mass of the auxiliary agent accounts for 2 to 10% of the composition.

[0010] Furthermore, the additives include one or more of the following: dispersants, preservatives, stabilizers, antifreeze agents, thickeners, or defoamers.

[0011] Furthermore, the formulation of the cyclohexane includes one or more of the following: water-dispersible granules, wettable powder, dry suspension, aqueous solution, water emulsion, or emulsifiable concentrate; the formulation of the sodium dimethyl chlorate includes one or two of the following: soluble powder, aqueous solution, or wettable powder; and the formulation of isooctyl fluclopyralid includes one or more of the following: emulsifiable concentrate, microemulsion, suspension, or dry suspension.

[0012] Furthermore, the dosage is 100~200mL / m 2 .

[0013] Application of the above-mentioned composition in the control of broadleaf weeds.

[0014] Furthermore, control deep-rooted weeds.

[0015] By adopting the above scheme, the method of the present invention has the following advantages: 1. The composition of the present invention has a plant control efficacy of 83.3% against Rumex rubra, solving the problem of its "inability to be killed above ground and easy regeneration underground". It is also safe and has no phytotoxicity to commonly used airport turfgrasses such as Bermuda grass, Kentucky bluegrass, Creeping bentgrass, and tall fescue, with low soil residue.

[0016] 2. The herbicide of the present invention, through the synergistic effect of its components, has a residual effect of more than 45 days, and the number of applications can be significantly reduced compared to a single herbicide.

[0017] 3. After applying the herbicide of the present invention, the number of insects (food source for birds) in the area decreased by 40%, and the activity range of birds obviously migrated outside the fence. This shows that the composition of the present invention can break the "grass-insect-bird" ecological chain in airports, significantly reduce the risk of bird strikes, and is suitable for lawns in the flight areas of various airports. It has extremely high promotional value.

[0018] 4. This invention is suitable for airport scenarios, easy to promote, and the required agents are all commercially available conventional products, requiring no special preparation. It can be quickly promoted in small and medium-sized airports and airports used by both military and civilian purposes. Attached Figure Description

[0019] Figure 1 A variance analysis diagram showing the control efficacy of Example 1 and Comparative Examples 1-15 against *Acidea cruris* sp. Figure 2 The variance analysis diagram shows the efficacy index of Rumex rubrum for Example 1 and Comparative Examples 1-15. Figure 3 This is a variance analysis diagram showing the control efficacy of Example 1 and Comparative Examples 1-15 against *Cirsium japonicum* plants. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1: (1) Take 0.1% xanthan gum, 4% polyethylene glycol, 0.3% citric acid, 1.5% sodium lauryl sulfate, 0.05% phosphate ester defoamer, 0.2% tangerine peel essential oil and 0.02% organosilicon defoamer as additives by weight percentage; premix xanthan gum with cold water and stir into a transparent colloid; add polyethylene glycol and citric acid in sequence and stir until completely dissolved; add sodium lauryl sulfate and phosphate ester defoamer at low speed and stir for 5 minutes; add tangerine peel essential oil and sodium lauryl sulfate after pre-emulsification, then add organosilicon defoamer and add water to the total amount to obtain the additive dispersion.

[0022] (2) Take 14.4 parts of 10% cyclohexane wettable powder, 84 parts of 56% sodium 2,4-D soluble powder, 80 parts of 30% isooctyl fluoride dispersible oil suspension emulsion, and 18 parts of 50% 2,4-D isooctyl ester emulsifiable concentrate by weight and mix them evenly; add adjuvant dispersion so that the amount of adjuvant is 5% of the total mass of the composition to obtain herbicide (No. T9).

[0023] Herbicides for Comparative Examples 1 to 14 were prepared according to the method of Example 1 and the proportions in Table 1.

[0024] Table 1:

[0025] Example Sample Testing: Changzhi Airport is located in Shanxi Province. 147 plant species have been identified in the flight area lawns and surrounding perimeter, of which broad-leaved plants account for 80.3% (118 species in total), with a density of 2-6 plants / m² for *Rumex rubra*. 2 Coverage of 10-35%, average plant height of 15-40cm, importance value of 0.36. Based on airport flight area operational guidelines and weed growth patterns, the application method includes the following steps: (1) Pretreatment: Clean up dead branches and fallen leaves on the lawn 3 days before application to ensure that the leaves of weeds are fully exposed; choose a sunny, light-winded day (wind speed ≤3m / s) with a relative humidity of 55%-65% and avoid applying the pesticide 24 hours before rainy days; (2) Spraying: Use a backpack electric sprayer (nozzle model TeeJet8002), spray at a height of 30cm above the weed canopy, move at a uniform speed (0.5m / s) to ensure that the liquid evenly covers the front and back of the leaves; apply the liquid in different areas according to different embodiments and comparative proportions, and set up a 1m isolation zone between the areas to avoid cross-contamination of the liquid.

[0026] The control efficacy per plant is calculated using the formula E=(D / S)×100%, where D is the number of target weeds that died in the plot after application, and S is the total number of target weeds in the plot before application. A control efficacy of ≥80% is considered high efficacy.

[0027] According to the formula Calculate the herbicide effect index, where E is the herbicide effect index (%), i is the symptom level, Ni is the number of weeds corresponding to level i, and N is the total number of weeds in the plot. max This represents the highest symptom severity level. The symptom severity level classification criteria are shown in Table 2. Table 2:

[0028] Figure 1 and Figure 2The figures show the analysis of variance (ANOVA) plots and the analysis of variance plots of efficacy index for the control efficacy of Example 1 and Comparative Examples 1-15 against *Corydalis tectorum*. Figure 1 and Figure 2 It can be seen that the efficacy index of the *Rumex rubra* in the examples and the comparative examples is not much different, but the control effect per plant is significantly different. The matching degree between the efficacy index and the control effect per plant in each comparative example is extremely low, indicating that after application to each comparative example, most of the *Rumex rubra* buds and grows again. Therefore, it is evident that only the composition of the present invention can fully act on the roots of *Rumex rubra* to achieve highly efficient control of *Rumex rubra*.

[0029] Figure 3 This is an analysis of variance graph showing the control efficacy of Example 1 and Comparative Examples 1-15 against *Cirsium japonicum* plants, for comparison. Figure 1 and Figure 3 It can be seen that the formulations of the examples and most comparative examples are highly effective in controlling *Sedum aizoon*. Comparative example 2 showed a plant control efficacy of over 80% against *Sedum aizoon*, but no efficacy against *Rumex rubra*, indicating that herbicides effective against other plants are not necessarily suitable for *Rumex rubra*. Example 1, which showed excellent control of *Rumex rubra*, only achieved about 50% plant control efficacy against *Sedum aizoon*, indicating that the composition of this invention is specific for the control of *Rumex rubra* and may not be applicable to other plants.

[0030] The theoretical control efficacy based on the Gowing method for multivariate combined treatment: As shown in Table 1, the five agents are denoted as variables A, B, C, D, and E. Their single-agent control efficacy (%) at the same dosage is E1, E2, E3, E4, and E5, respectively. The theoretical control efficacy (E0) of the five-variable mixed system is calculated according to the "step-by-step superposition" principle, as follows: Calculate the theoretical protective effect of the first two variables (A+B): E 012 =E1+E2×(1-E1 / 100); Adding a third variable (C), calculate the theoretical protective effect of A+B+C: E 0123 =E 012 +E3×(1-E 012 / 100); Adding a fourth variable (D), calculate the theoretical protective effect of A+B+C+D: E 1234 =E 0123 +E4×(1-E 0123 / 100); Adding a fifth variable (E), calculate the final theoretical protective effect of the five variables: E0total = Etotal 01234 +E5×(1-E 01234 / 100). The results are shown in Table 3: Table 3:

[0031] Combined with Table 2 Figure 1 It can be seen that the theoretical control efficacy of the herbicide in Example 1 25 days after application was lower than the actual control efficacy, with a synergistic effect of 9.7%, indicating a significant synergistic effect. This demonstrates that the components in the composition of this invention can produce a synergistic effect on the control of *Rumex rubrum*. The other comparative examples did not show significant synergistic effects, and some even had very poor control efficacy, indicating that the formulations of each comparative example could not produce a significant killing effect on the roots of *Rumex rubrum* in practical applications.

[0032] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this invention.

Claims

1. A highly effective herbicidal composition for use in airport turf broadleaf weeds, characterized by, By mass parts, it includes the following components: 1~2 parts of carfentrazone-ethyl, 28~56 parts of sodium dimethomorph, 15~30 parts of fluroxypyr-meptyl, 5~15 parts of 2-4D-ethylhexyl.

2. The herbicidal composition for use in broadleaf weeds of an airfield turf according to claim 1, characterized by, By mass parts, it includes the following components: 10~20 parts of 10% carfentrazone-ethyl, 50~100 parts of 56% sodium dimethomorph, 50~100 parts of 30% fluroxypyr-meptyl, 10~30 parts of 50% 2-4D-ethylhexyl.

3. The herbicidal composition for use in broadleaf weeds of an airfield turf according to claim 1, characterized by, The combination of single dose and / or complex dose of each component.

4. A herbicide comprising the composition according to any one of claims 1 to 3, characterized in that, It includes the composition and the adjuvant.

5. The herbicide according to claim 4, characterized in that, The mass of the adjuvant accounts for 2~10% of the composition.

6. The herbicide according to claim 4, wherein The adjuvant includes one or several of dispersant, preservative, stabilizer, antifreezing agent, thickening agent or defoaming agent.

7. The herbicide according to claim 4, wherein The dosage form of the carfentrazone-ethyl includes one or several of water dispersible granule, wettable powder, dry suspension, water agent, emulsion in water or emulsion oil; the dosage form of the sodium dimethomorph includes one or two of soluble powder, water agent or wettable powder; the dosage form of the fluroxypyr-meptyl includes one or several of emulsion oil, microemulsion, suspension or dry suspension.

8. The herbicide according to claim 4, wherein The dose of the medicine is 100-200 mL / m 2 .

9. The use of the composition of any one of claims 1~3 in the control of broadleaf weeds.

10. Use according to claim 9, characterized in that, The control of deep-rooted weeds.

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