Ternary weeding composition containing mesotrione, clomazone and cyhalofop-butyl

Abstract

The invention belongs to the technical field of pesticide compositions, and particularly discloses a ternary weeding composition containing mesotrione, clomazone and cyhalofop-butyl, the active ingredients of the weeding composition are composed of mesotrione, clomazone and cyhalofop-butyl, in the weeding composition, the active ingredients of the mesotrione, the clomazone and the cyhalofop-butyl are mixed uniformly, and the active ingredients of the clomazone and the cyhalofop-butyl are mixed uniformly. The weeding composition comprises the following components in percentage by weight: 1-5wt% of mesotrione, 3-9wt% of clomazone, 12-18wt% of cyhalofop-butyl and the balance of auxiliary materials. The mesotrione, the clomazone and the cyhalofop-butyl are combined, the weeding composition is used for treating stems and leaves of weeds in the rice field and preventing and treating the weeds in the rice field by combining sealing and killing, and according to indoor biological activity determination and field tests, the weeding effect is extremely good, and the weeding composition has a positive effect on solving increasingly increased resistant weeds in the rice field.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide compositions and relates to a herbicidal composition, in particular to a ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl. Background Art

[0002] Rice is the main food of our country, and its annual total output ranks first in the world. In recent years, paddy field weeds have become the main obstacle to rice production. The frequency of field drug use is high, and the cost of drug use is high. The control of weeds in paddy fields has fallen into a vicious cycle in which weed resistance increases with the increase in the frequency and amount of herbicide use. At present, my country has promoted the large-scale cultivation of rice, such as direct-seeding rice and wheat field seeding. Although it saves labor costs, the difficulty of weed control has always been a "headache" for farmers and an urgent problem to be solved in current rice production. The field rice weed control procedures usually adopt a multiple drug use method of "one seal, two kills and three supplements", which often cannot solve the problem. It is estimated that the cost of herbicides alone often accounts for about 40% of the cost of rice drugs. At present, conventional rice field herbicides have developed resistance to weeds after years of large-dose use.

[0003] Mesotrione is a new type of HPPD inhibitory herbicide. It inhibits the activity of HPPD in plants, thereby blocking the process of converting its substrate into homogentisate, resulting in the inability to synthesize tocopherol and plastoquinone normally, thereby affecting the synthesis of carotene in the target plant (weeds), causing the stems and leaves of the weeds to turn white, which cannot be reversed and reappears, and ultimately causing the weeds to die completely.

[0004] Isopropylamine is an organic heterocyclic oxazolidine selective herbicide and a carotenoid biosynthesis inhibitor. The agent is absorbed by the roots and young shoots of plants, and is transmitted upward to the leaves through the roots with transpiration, inhibiting chlorophyll synthesis. The plant will die in a short period of time. It can be used as a stem and leaf treatment or soil treatment, and can effectively prevent and control annual grass weeds such as Leptochloa chinensis, Echinochloa crus-galli, and Digitaria tangutica in rice fields, as well as some broad-leaved weeds.

[0005] Cyhalofop-butyl is an aromatic oxyphenoxypropionic acid herbicide, which is currently the most widely used variety with high safety to rice and is a post-emergence stem and leaf treatment agent. It is absorbed by the leaves and sheaths of the plant body, conducted by the phloem, and accumulated in the meristem area of ​​the plant body, resisting acetyl coenzyme A carboxylase (ACCase), stopping fatty acid synthesis, preventing normal cell growth and division, and damaging lipid-containing structures such as the membrane system, ultimately leading to plant death.

[0006] The above three substances are used alone or in combination in herbicidal compositions for weed control of rice. However, the efficacy of these compositions has been verified to be up to 30 days at most. If the time is extended, the efficacy will show a significant downward trend, resulting in multiple applications of pesticides during the entire rice growth period. This undoubtedly puts pressure on agricultural production and environmental protection. Therefore, the development of a long-acting herbicide that can achieve one-time disinfecting will have an important driving significance for the prevention and control technology of rice weeds. Summary of the invention

[0007] In view of the shortcomings of the prior art, the object of the present invention is to provide a ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl. The herbicidal composition of the present invention, in view of the characteristics of large-scale direct-seeding rice planting in my country, combines mesotrione, clomazone and cyhalofop-butyl for treating the stems and leaves of weeds in rice fields, and combines blocking and controlling weed damage in rice fields. The herbicidal composition has an excellent weed control effect through indoor biological activity determination and field test verification, and has a positive effect on solving the problem of increasing resistant weeds in rice fields.

[0008] The present invention is achieved through the following technical solutions:

[0009] A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl, wherein the active ingredients of the herbicidal composition consist of mesotrione, clomazone and cyhalofop-butyl, and in the herbicidal composition, mesotrione accounts for 1-5wt%, clomazone accounts for 3-9wt%, cyhalofop-butyl accounts for 12-18wt%, and the rest are auxiliary materials.

[0010] A further improvement of the present invention is:

[0011] In the herbicidal composition, mesotrione accounts for 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%.

[0012] Furthermore, in the herbicidal composition, the proportion of clomazone is 3wt%, 6wt% or 9wt%.

[0013] Furthermore, in the herbicidal composition, cyhalofop-butyl accounts for 15 wt %.

[0014] Furthermore, the auxiliary material includes cyclohexanone, sec-butyl acetate, styrylphenyl polyoxyethylene ether, Tween 80, and one of palm oil and soybean oil, or a mixture of the two.

[0015] Furthermore, the pesticide formulation of the herbicidal composition is selected from one of water dispersible granules, emulsifiable concentrates, water suspensions, wettable powders, aqueous solutions, dispersible oil suspensions, and microemulsions.

[0016] A further improvement of the present invention is:

[0017] Application of the ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl in preventing and controlling weeds in rice fields.

[0018] Furthermore, the weeds are one or a mixture of two or more of barnyard grass, Leptochloa chinensis, Digitaria sanguinea or broadleaf grass.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The herbicidal combination of the present invention preferably combines the herbicide mesotrione, which has high activity, low dosage and novel weed-killing mechanism, with the current mainstream herbicide varieties of clomazone and cyhalofop-butyl, which have high safety, to prevent and kill resistant weeds in rice fields. Mesotrione is a novel compound with a completely different weed-killing mechanism from the current mainstream herbicides, and was originally used for corn crops. In recent years, its use has been expanded to rice fields, and the existing registered varieties in China also refer to foreign formula combinations for use as soil treatment in transplanted rice fields. The present application uses mesotrione in combination with clomazone and cyhalofop-butyl for the treatment of stems and leaves of weeds in rice fields, and combines blocking and killing to prevent and control weed damage in rice fields. After indoor biological activity determination and field trials, it has been verified that the weed-killing effect is excellent, which has a positive effect on solving the increasing number of resistant weeds in rice fields.

[0021] 1. Novel weed-killing mechanism, no weed resistance

[0022] Mesotrione in this weed control combination is a new type of HPPD-inhibiting herbicide. HPPD is a newly discovered target of herbicides in the 1990s. It has a novel weed-killing mechanism and has a good control effect on weeds that are resistant to the current mainstream rice field herbicides, bringing hope to solving the problem of weed resistance.

[0023] 2. High efficiency, small dosage, can reduce the dosage of medicine by 50%

[0024] Mesotrione has extremely high chemical activity, and the dosage is only 3-5g per mu. After compounding, it can reduce the dosage of active ingredients of pesticides by nearly 40-50%, reduce the ecological environmental pressure of farmland, and is very friendly to the environment.

[0025] 3. Scientific and reasonable combination, increasing speed and efficiency

[0026] This herbicide combination is a combination of three different weed-killing mechanisms. It acts on multiple weed targets, accelerating the process from weed poisoning to death. The agent can be absorbed through stems and leaves as well as roots, thus ensuring the weed-killing effect, preventing weeds from reviving and making it difficult for them to develop resistance.

[0027] 4. Good affinity to rice, safe and guaranteed

[0028] Mesotrione has extremely high biological activity and is very effective in controlling weeds, but it has high requirements on rice seedling quality indicators and application conditions. When combined with commonly used herbicides with better safety, its safety is greatly improved.

[0029] 5. Long-lasting efficacy, can kill weeds in one go

[0030] The three-way compound of mesotrione, clomazone and cyhalofop-butyl in the present invention is a combination of three different weed-killing mechanisms, which overcomes weed resistance; it has two different modes of action, soil (root system) treatment + stem and leaf treatment, and the complementary combination of "blocking" effectively prolongs the weed control period. It is suitable for various rice planting methods, and a one-time application can basically solve the weed damage problem during the entire growth period of rice. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with specific embodiments.

[0032] Example 1: Dispersible oil suspension.

[0033] Mesotrione 1%, clomazone 3%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0034] Example 2: Dispersible oil suspension.

[0035] Mesotrione 1%, clomazone 6%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0036] Example 3: Dispersible oil suspension.

[0037] Mesotrione 1%, clomazone 9%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0038] Example 4: Dispersible oil suspension.

[0039] Mesotrione 2%, clomazone 9%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0040] Example 5: Dispersible oil suspension.

[0041] Mesotrione 3%, clomazone 3%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0042] Example 6: Dispersible oil suspension.

[0043] Mesotrione 3%, clomazone 6%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0044] Example 7: Dispersible oil suspension.

[0045] Mesotrione 3%, clomazone 9%, cyhalofop-butyl 15%, alkylphenol polyoxyethylene formaldehyde condensate 7%, calcium dodecylbenzene sulfonate 9%, sodium alginate 2.5%, Tween 80 5%, white carbon black 3%, palm oil or soybean oil 100%. The above materials are mixed in proportion, stirred evenly, dispersed evenly by high-speed shearing, and sand-milled in a sand mill to prepare a dispersible oil suspension.

[0046] Example 8: Emulsifiable concentrate formulation.

[0047] Mesotrione 4%, clomazone 6%, cyhalofop-butyl 15%, cyclohexanone 15%, sec-butyl acetate 20%, styrylphenyl polyoxyethylene ether 10%, Tween 80 5%, palm oil or soybean oil to 100%. The above materials are mixed according to proportion and stirred evenly to obtain an emulsifiable concentrate formulation.

[0048] Example 9: Emulsifiable concentrate formulation.

[0049] Mesotrione 5%, clomazone 3%, cyhalofop-butyl 15%, cyclohexanone 15%, sec-butyl acetate 20%, styrylphenyl polyoxyethylene ether 10%, Tween 80 5%, palm oil or soybean oil to 100%. The above materials are mixed according to proportion and stirred evenly to obtain an emulsifiable concentrate formulation.

[0050] Embodiment 10:

[0051] EC formulation. Mesotrione 5%, clomazone 6%, cyhalofop-butyl 15%, cyclohexanone 15%, sec-butyl acetate 20%, styrylphenyl polyoxyethylene ether 10%, Tween 80 5%, palm oil or soybean oil to 100%. Mix the above materials according to proportion and stir evenly to obtain EC formulation.

[0052] Embodiment 11:

[0053] Emulsifiable concentrate formulation. Mesotrione 5%, clomazone 9%, cyhalofop-butyl 15%, cyclohexanone 15%, sec-butyl acetate 20%, styrylphenyl polyoxyethylene ether 10%, Tween 80 5%, palm oil or soybean oil to 100%. Mix the above materials according to proportion and stir evenly to obtain an emulsifiable concentrate formulation.

[0054] The composition can be processed into various pesticide application forms with auxiliary ingredients: solvents, emulsifiers, wetting agents, dispersants, adhesives, thickeners, fillers, solid carriers, etc. Such as emulsifiable concentrates, oil-dispersible suspensions, water emulsions, wettable powders, etc. Preferred forms: emulsifiable concentrates, oil-dispersible suspensions.

[0055] Verification Example

[0056] (I) Indoor biological activity and combined action determination of mixtures

[0057] Test method: refer to "Pesticide Indoor Bioassay Test Guidelines Herbicides NY / T1155.4-2006", use the stem and leaf spray method. After 21 days, visually inspect the target damage symptoms and growth inhibition, weigh the fresh weight of the aboveground part, and calculate the fresh weight inhibition rate of the target weeds.

[0058]

[0059] The Colby method is used to evaluate the combined effect of two or more herbicidal active ingredients. The formula is as follows:

[0060]

[0061] Wherein: A is the survival rate or fresh weight residual rate (%) of the target weeds when the active compound A is used at a dosage of mg / ha or a concentration of mppm;

[0062] B is the survival rate or fresh weight residual rate (%) of the target weeds when the active compound B is used at a dosage of ng / ha or a concentration of nppm;

[0063] C is the survival rate or fresh weight residual rate (%) of the target weeds when the active compound C is used at a dosage of hg / ha or a concentration of hppm;

[0064] N is the number of herbicidal active ingredients in the mixture.

[0065] E0 is the theoretical value of the survival rate or fresh weight residual rate (%) of the target weeds when the active compounds A, B and C are mixed at a dosage of m,n,hg / ha or a concentration of m,n,hppm;

[0066] E is the observed value of the survival rate or fresh weight residual rate (%) of the target weeds when the active compounds A, B and C are mixed at a dosage of m, n, hg / ha or a concentration of m, n, hppm;

[0067] If the actually observed target weed survival rate or fresh weight residual rate is less than the theoretical target weed survival rate or fresh weight residual rate, then the composition exhibits a synergistic effect and has a desirable synergistic effect.

[0068] E0-E>10% is a synergistic effect, E0-E<10% is an antagonistic effect; E0-E value between the theoretical value ±10% is an additive effect.

[0069] Table 1: Results of indoor biological activity and combined action tests ★

[0070]

[0071] ★ Test grass species: barnyard grass seeds.

[0072] From the results of biological activity and combined action determination in Table 1, it can be seen that when mesotrione, clomazone and cyhalofop-butyl are combined, the observed values ​​of fresh weight residual rate of barnyard grass in each treatment are significantly lower than the theoretical value, and E0-E (%) is between 19.89 and 29.58%, indicating that the ternary combination has a good combined synergistic effect on weeds.

[0073] (II) Field efficacy test

[0074] The field efficacy test method refers to "GB / T17980.40-2000 Pesticide Guidelines for the field efficacy trials (I) herbicides against weeds in rice".

[0075] Field conditions: The rice variety in the experimental field is japonica rice, and the field grass is a mixture of barnyard grass, Leptochloa chinensis, Digitaria sanguinea and broad-leaved weeds.

[0076] Test method: The test set up a treatment group and a blank control group. The test plots were randomly arranged with a plot area of ​​25 square meters and repeated 4 times. Direct seeding paddy fields were used, and soil sealing treatment was performed without medication. When the seedlings were 5-6 leaves old, they were sprayed manually and stems and leaves were treated.

[0077] The field efficacy survey was conducted twice, with the first survey 30 days after the application of the medicine. The survey method adopted the estimated (visual) value survey method. Each treatment area was compared with the blank control area, and the weed quantity, coverage and growth potential were used as reference indicators.

[0078] Visual estimates are graded as follows:

[0079] Level 1: No grass;

[0080] Level 2: Equivalent to 0-2.5% of the blank control area;

[0081] Level 3: Equivalent to 2.6% to 5% of the blank control area.

[0082] Level 4: Equivalent to 5.1% to 10% of the blank control area;

[0083] Level 5: Equivalent to 10.1% to 15% of the blank control area;

[0084] Level 6: Equivalent to 15.1% to 25% of the blank control area;

[0085] Level 7: Equivalent to 25.1% to 35% of the blank control area;

[0086] Level 8: Equivalent to 35.1% to 67.5% of the blank control area;

[0087] Level 9: Equivalent to 67.6% to 100% of the blank control area

[0088] The second survey was conducted 45 days after the application of the medicine, when all weeds in the rice fields had emerged. The weed species were examined and the control efficacy was calculated based on the fresh weight of the weeds.

[0089] Efficacy calculation formula:

[0090]

[0091] Where: PT——Number of remaining grass in the treatment area (or fresh weight)

[0092] CK——Number of live grasses (or fresh weight) in the blank control area

[0093] Table 2 Field efficacy test results of herbicide combinations

[0094]

[0095]

[0096] The results of the field tests showed that each of the embodiments of mesotrione, clomazone and cyhalofop-butyl had excellent control effects on barnyardgrass, chinensis, crabgrass and broad-leaved weeds in rice fields.

[0097] According to the visual estimation survey 30 days after the application of the medicine, the control effect of each embodiment is below level 3, that is, the overall control effect on the weed community is above 95%.

[0098] 45 days after application, the weeds in paddy fields were investigated after the second peak of weed emergence. The fresh weed control effect of each treatment was also very ideal, and the control effect of the combination with the active ingredient dosage of mesotrione above 2g per mu could reach more than 90%.

[0099] (III) Safety (compatibility with crops) evaluation

[0100] Clomazone and cyhalofop-butyl have been widely used in rice fields and are varieties with a relatively high safety factor among herbicides. The safety test is mainly designed for mesotrione, with different doses of mesotrione set at 2, 4, 6, 8, and 10 grams of the active ingredient per mu of mesotrione, respectively. After the application of the drug, the damage and symptoms were observed for two weeks, and the observations were recorded every other day.

[0101] The classification standards for pesticide damage (systemic herbicides) are as follows:

[0102] Level 1: Rice grows normally without any damage symptoms;

[0103] Level 2: The rice is slightly damaged by pesticides, with the damage to the rice less than 10%;

[0104] Level 3: Moderate damage to rice, which can be recovered later and does not affect yield:

[0105] Level 4: The rice is seriously damaged by pesticides and is difficult to recover, resulting in reduced yield;

[0106] Level 5: The rice is severely damaged by pesticides and cannot recover, resulting in a significant reduction in yield or even total loss.

[0107] Safety observations are as follows:

[0108] Table 3: Phytotoxicity levels and symptoms

[0109]

[0110]

[0111] As can be seen from Table 3, there was no seedling death caused by mesotrione. When the mesotrione dosage per mu was 6 grams or less, the rice seedlings showed no symptoms of phytotoxicity. When the mesotrione dosage per mu was increased to 8-10 grams, the seedlings temporarily turned yellow and white, which is a typical reaction of systemic herbicides and is normal. The symptoms disappeared quickly as the seedlings grew, and the growth resumed quickly, which is safe for rice.

[0112] Based on the above biological tests and field test results, the three-way combination of mesotrione, clomazone and cyhalofop-butyl is a combination of three different weed control mechanisms, which overcomes weed resistance; it has two different modes of action, soil (root system) treatment + stem and leaf treatment, and the complementary combination of "blocking" effectively extends the weed control period. It is suitable for various rice planting methods, and a one-time application can basically solve the weed problem during the entire rice growth period.

[0113] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl, characterized in that: The active ingredients of the herbicidal composition are composed of mesotrione, clomazone and cyhalofop-butyl. In the herbicidal composition, mesotrione accounts for 1-5wt%, clomazone accounts for 3-9wt%, cyhalofop-butyl accounts for 12-18wt%, and the rest are auxiliary materials.

2. A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl according to claim 1, characterized in that: In the herbicidal composition, mesotrione accounts for 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%.

3. A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl according to claim 1, characterized in that: In the herbicidal composition, the proportion of clomazone is 3wt%, 6wt% or 9wt%.

4. A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl according to claim 1, characterized in that: In the herbicidal composition, cyhalofop-butyl accounts for 15 wt %.

5. The ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl according to claim 1, characterized in that: The auxiliary materials include cyclohexanone, sec-butyl acetate, styrylbenzene polyoxyethylene ether, Tween 80, and one of palm oil and soybean oil, or a mixture of the two.

6. A ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl according to claim 1, characterized in that: The pesticide formulation of the herbicidal composition is selected from one of water dispersible granules, emulsifiable concentrates, water suspensions, wettable powders, aqueous solutions, dispersible oil suspensions and microemulsions.

7. Use of the ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl as claimed in claim 1 in controlling weeds in rice fields.

8. The use of a ternary herbicidal composition containing mesotrione, clomazone and cyhalofop-butyl in controlling weeds in rice fields according to claim 7, characterized in that: The weeds are one or a mixture of two or more of barnyard grass, Leptochloa chinensis, Digitaria sanguinea or broadleaf grass.

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