Herbicide composition for sunflower field

Abstract

The invention discloses a herbicide composition for a sunflower field. The herbicide composition comprises 22%-84% of herbicide active ingredients and the balance of auxiliaries acceptable in pesticide science, wherein the active ingredients of the herbicide are composed of pyroxasulfone, sulfentrazone and prometryn, the invention discloses the herbicide compounded by ternary combination of pyroxasulfone, prometryn and sulfentrazone for the first time, the herbicide composition is high in safety to sunflowers and excellent in control effect on broadleaf weeds, meanwhile, the herbicide composition is high in safety to sunflowers, and even if the dosage of the herbicide composition is high, the control effect on the sunflowers is excellent. Growth is not inhibited, the lasting period is as long as 60 days, weeds in the whole seedling stage are thoroughly controlled, and the pesticide application frequency is reduced; the composition has the advantages of high activity and low dosage, and compared with the existing medicament, the dosage of the effective components can be reduced from 1373ga.i. / ha to 330ga.i. / ha, which accords with the policy of zero increase of pesticide and chemical fertilizer in the Ministry of Agricultural Rural Pesticide and Chemical Fertilizer.

Description

Technical Field

[0001] The invention belongs to the technical field of herbicide compositions, and in particular relates to a herbicide composition used in a sunflower field. Background Art

[0002] Sunflower is one of the five major oil crops along with rapeseed, soybean, peanut and sesame. The content of linoleic acid and oleic acid in sunflower oil is as high as 66% and 26.4%, respectively. It is also rich in vitamin A, vitamin E, carotene and other nutrients, and is known as "health edible oil".

[0003] my country's sunflower planting area is stable at more than 10 million mu, mainly distributed in Inner Mongolia, Xinjiang, Gansu and other places. Sunflower belongs to the Asteraceae family. It can take up to two months from sowing to budding. The weeds that harm the seedlings are divided into grass weeds (such as barnyard grass, foxtail grass, crabgrass, reed, bermudagrass, and goosegrass) and broadleaf weeds (nightshade, thorny grass, gray grass, purslane, Amaranthus retroflexus, Xanthium sibiricum, ramie, alkali sedge, Amaranthus ferox, and dandelion). In particular, broadleaf weeds are difficult to control, and weeds often fail to be controlled.

[0004] The literature reports that registered and potential sunflower field herbicides such as (fine) isopropylamine, oxyfluorfen, promethazine, saflufenacil, sulfentrazone, terbuthion, etc. have good control effects on some grass weeds, but their control effects on broadleaf weeds are relatively limited. In particular, broadleaf weeds such as Solanum nigrum, Echinops chinensis, and Echinops chinensis are difficult to achieve ideal control effects due to their growth characteristics and physiological mechanisms. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0007] Therefore, the object of the present invention is to overcome the deficiencies in the prior art and provide a herbicide composition for sunflower fields.

[0008] In order to solve the above technical problems, the present invention provides the following technical solution: the herbicide composition contains 22% to 84% of herbicide active ingredients in terms of mass percentage, and the remainder is an adjuvant acceptable in pesticides; wherein the herbicide active ingredients are composed of sulfamethoxazole, sulfentrazone and cypermethrin.

[0009] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the composition comprises, in terms of mass percentage of the active ingredients of the herbicide,

[0010] 8% to 24% of sulfamethoxazole, 4% to 15% of sulfentrazone, and 10% to 45% of promethazine.

[0011] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the mass ratio of pyraclostrobin, sulfentrazone and promethazine is 8:4-5:10-15.

[0012] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the mass ratio of pyraclostrobin, sulfentrazone and promethazine is 8:4:10.

[0013] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the pesticide-acceptable adjuvant includes a pesticide-acceptable surfactant and a pesticide-acceptable carrier.

[0014] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the dosage form of the herbicide composition includes one of a suspension concentrate, a dispersible oil suspension concentrate, a microcapsule suspension concentrate, a water-dispersible granule, and a wettable powder.

[0015] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the herbicide composition is used for controlling broadleaf and grass weeds in sunflower fields.

[0016] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the herbicide composition is applied to the sunflower field at a dosage of 330 to 660 ga.i. / ha.

[0017] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, after the herbicide composition is applied to the sunflower field, the growth of sunflowers is safe and the duration of efficacy is >60 days.

[0018] As a preferred embodiment of the herbicide composition for sunflower fields of the present invention, the herbicide composition applied to the sunflower field has a control efficiency of 96.1-100% against broadleaf weeds and a control efficiency of 95.8-100% against gramineous weeds.

[0019] Beneficial effects of the present invention:

[0020] The present invention discloses for the first time a herbicide compounded by combining pyraclostrobin, promethazine and sulfentrazone. The herbicide composition is highly safe for sunflowers and has excellent control effect on broadleaf weeds. Compared with the existing scheme, it has the following beneficial effects:

[0021] 1. The three-way synergistic ratio significantly enhances the effect on broadleaf weeds;

[0022] 2. High safety for sunflower, even at high doses, growth is not inhibited;

[0023] 3. The effective period is up to 60 days, which can thoroughly control weeds during the entire seedling stage and reduce the number of times of application;

[0024] 4. High activity and low dosage. Compared with existing agents, the dosage of active ingredients is reduced from 1373 ga.i. / ha to 330 ga.i. / ha, which is in line with the zero-growth policy of the Ministry of Agriculture and Rural Affairs for pesticides and fertilizers. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the embodiments of the specification.

[0026] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0027] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0028] Unless otherwise specified, the raw materials used in the present invention are all commercially available in the art.

[0029] The herbicide compositions of different formulations prepared in the specific embodiments of the present invention are all prepared according to conventional methods in the art.

[0030] The method for determining the weed control efficiency, plant height inhibition rate and selectivity index of the herbicide composition of the present invention is as follows:

[0031] The test adopts the greenhouse pot method. Sunflowers are sown in small flower pots filled with 3 / 5 culture soil, and 3*3 seeds are sown in each pot. The seeds of quinoa, nightshade, Amaranthus retroflexus, and purslane are germinated and mixed in equal amounts in small flower pots filled with 3 / 5 culture soil. Each pot is sown with 15 different weed seeds, and the soil is covered with 1-2mm after sowing. Water is added to the tray with the small flower pot. After the water completely soaks the culture soil, the excess water in the tray is poured out. 24h after sowing, the soil is sprayed with ASS-5 walking spray tower (spraying herbicide composition), and clear water is set as a blank control. Then it is transferred to the greenhouse for further cultivation and observation. After 30 days, the plant height of sunflowers and the fresh weight of the aboveground parts of each treated weed are investigated. Except for 1-2 days after spraying, watering is not allowed, and watering is done regularly to maintain soil moisture.

[0032] Ex weed control efficiency % = 1-fresh weight of weeds in treatment group / fresh weight of weeds in blank control group * 100%

[0033] Ei Crop height inhibition rate % = 1-crop height in treatment group / crop height in blank control group * 100%

[0034] The lowest effective dose ED90 of the pesticide on major sensitive weeds was used as the herbicide activity evaluation index, and the highest safe dose ED10 (NOEL) when the plant height inhibition rate of the pesticide on the applied crop did not exceed 10% was used as the crop safety evaluation index.

[0035] Selectivity coefficient I = ED10 / ED90

[0036] When I ≥ 4, the agent is considered to have excellent selectivity and good value for field promotion;

[0037] When I ≥ 2, the agent is considered to have a certain degree of selectivity and can be used for field trials;

[0038] When I<2, it is considered that the agent has poor selectivity and has no development potential.

[0039] The survival rate and combined effect of the herbicide composition of the present invention on grass and broad-leaved weeds were determined by indoor toxicity test, and the test method is as follows:

[0040] The experiment adopted the greenhouse potting method. The seeds of Amaranthus retroflexus, Solanum nigrum, Setaria viridis, and Eleocharis truncatula were germinated and sown in small flower pots filled with 3 / 5 culture soil. 8×8 seeds were sown in each pot and covered with 1-2mm of soil after sowing. Water was added to the tray with the small flower pots. After the water completely soaked the culture soil, the excess water in the tray was poured out.

[0041] 24 hours after sowing, the soil was sprayed with ASS0-5 walking spray tower (spraying the test agent), and clean water was set as a blank control. Then the plants were transferred to the greenhouse for further cultivation and observation. After 20 days, the aboveground fresh weight of the weeds in each treatment was investigated. Except for 1 to 2 days after spraying, water was applied regularly to maintain soil moisture.

[0042] Weed survival rate calculation method:

[0043] E Weed survival rate % = fresh weight of weeds in treatment group / fresh weight of weeds in blank control group * 100%

[0044] The herbicidal activity of the mixture was tested by the Colby method, i.e., E0 = ABC / 10000;

[0045] Wherein, A is the single-dose weed survival rate of herbicide 1 (pentadimethoate), B is the single-dose weed survival rate of herbicide 2 (promethazine), C is the single-dose weed survival rate of herbicide 3 (safensulfuron), and E0 is the theoretical survival rate of mixed herbicides;

[0046] E is the measured survival rate of the mixed herbicide. According to the Colby method, when E0-E ≥ 10%, it means that the mixed herbicide has a synergistic effect; when E0-E ≤ -10%, it means that the mixed herbicide has an antagonistic effect; when the E0-E value is between ±10%, it means that the mixed herbicide has an additive effect.

[0047] Example 1

[0048] This example provides a test on the survival rate of a ternary composition of sulfamethoxazole, sulfentrazone and promethazine in different ratios and an evaluation of the combined effect on Chenopodium album. The concentration of each component in the composition, the application dosage and the survival rate of Chenopodium album are shown in Table 1.

[0049] Table 1

[0050]

[0051]

[0052] It can be seen from Table 1 that when pyraclostrobin: sulfentrazone: promethazine = 8:4:10-15, the combination exhibits a synergistic effect on Chenopodium album, and other tested ratios exhibit an additive effect on Chenopodium album.

[0053] Example 2

[0054] This example provides a test on the survival rate of Solanum nigrum using a ternary composition of sulfamethoxazole, sulfentrazone and promethazine in different ratios and an evaluation of their combined effects. The concentration of each component in the composition, the application dosage and the survival rate of Solanum nigrum are shown in Table 2.

[0055] Table 2

[0056]

[0057]

[0058] As can be seen from Table 2, the results show that when pyraclostrobin: sulfentrazone: promethazine = 8:4:10-15, the composition exhibits a synergistic effect on Solanum nigrum, and other tested ratios exhibit an additive effect on Solanum nigrum.

[0059] Example 3

[0060] This example provides a test on the survival rate of purslane and an evaluation of the combined effect of a ternary composition of sulfamethoxazole, sulfentrazone and promethazine in different ratios. The concentration of each component in the composition, the application dosage and the survival rate of purslane are shown in Table 3.

[0061] Table 3

[0062]

[0063]

[0064] It can be seen from Table 3 that when the ratio of pyraclostrobin: sulfentrazone: promethazine = 8:4-5:10 or 8:5:15, the composition exhibits a synergistic effect on Portulaca oleracea, and other ratios tested exhibit an additive effect on Portulaca oleracea.

[0065] Example 4

[0066] This example provides a test on the survival rate of a ternary composition of sulfamethoxazole, sulfentrazone and promethazine in different ratios and an evaluation of the combined effect on Amaranthus retroflexus. The concentration of each component in the composition, the application dosage and the survival rate of Portulaca oleracea are shown in Table 4.

[0067] Table 4

[0068]

[0069]

[0070] The results showed that when the ratio of pyraclostrobin: sulfentrazone: cypermethrin = 8:4-5:10 or 8:5:15, the combination showed a synergistic effect on Amaranthus retroflexus, and other ratios tested showed an additive effect on Amaranthus retroflexus.

[0071] Indoor joint toxicity evaluation showed that when the ratio of sulfamethoxazole: sulfentrazone: promethazine = 8:4-5:10-15, it showed a synergistic effect on the control of Chenopodium album, Solanum nigrum, Portulaca oleracea and Amaranthus retroflexus.

[0072] Comparative Example 1

[0073] This comparative example compares the selectivity of single sulfonepyraclostrobin, S-isopropylamine and pendimethalin to sunflower and test weeds, and the results are shown in Table 5.

[0074] Table 5

[0075]

[0076]

[0077] As can be seen from Table 5, the selectivity indexes of pyraclostrobin, S-isopropylamine and pendimethalin for sunflower and the tested weeds were 19.81, 17.87 and 13.48, respectively, indicating that the three ingredients are relatively safe for sunflower, among which pyraclostrobin is safer for sunflower than S-isopropylamine and pendimethalin, and is more effective in controlling broadleaf weeds.

[0078] Comparative Example 2

[0079] This comparative example compares the selectivity of single bensulfuron, oxyfluorfen and sulfentrazone on sunflower and test weeds, and the results are shown in Table 6.

[0080] Table 6

[0081]

[0082]

[0083] As can be seen from Table 6, the selectivity indexes of saflufenacil, oxyfluorfen and sulfentrazone to sunflower and the tested weeds were 0.55, 3.66 and 9.76, respectively. This indicates that at the tested dose, sulfentrazone has the highest safety to sunflower and better control effect on broadleaf weeds, while saflufenacil has the worst selectivity and is not suitable for pre-emergence weeding in sunflower fields.

[0084] Comparative Example 3

[0085] This comparative example compares the selectivity of single promethazine, terbuthylazine and simazine to sunflower and tested weeds. The results are shown in Table 7.

[0086] Table 7

[0087]

[0088]

[0089] As can be seen from Table 7, the selectivity indexes of promethazine, terbuthylazine and simazine to sunflower and the tested weeds were 10.6, 4.97 and 5.69, respectively, indicating that at the tested dose, promethazine was safer to sunflower and had better control effect on broad-leaved weeds.

[0090] Example 5

[0091] This embodiment provides a herbicide composition (suspension concentrate) for sunflower fields, and the formula is as follows:

[0092]

[0093] Example 6

[0094] The present embodiment provides a herbicide composition (wettable powder) for sunflower fields, and the formula is as follows:

[0095]

[0096] Comparative Example 4

[0097] This comparative example provides a herbicide composition (suspension concentrate) for sunflower fields, which is different from Example 5 in that the active ingredient sulfentrazone is adjusted to oxyfluorfen, and the formula is as follows:

[0098]

[0099] Comparative Example 5

[0100] This comparative example provides a herbicide composition (suspension concentrate) for sunflower fields, which is different from Example 5 in that the active component sulfentrazone is adjusted to oxyfluorfen, and prometryn is adjusted to terbuthylazine, and the formula is as follows:

[0101]

[0102]

[0103] Comparative Example 6

[0104] This comparative example provides a herbicide composition (suspension concentrate) for sunflower fields, which is different from Example 5 in that the active ingredient prometryn is adjusted to terbuthylazine, and the formula is as follows:

[0105]

[0106] Example 7

[0107] In order to verify the performance of the herbicide combination prepared in Example 5, Example 6 and Comparative Examples 4 to 6 of the present application, field experiments were carried out on them, and 40% sulfonepyraclostrobin SC (Shanghai Qunli Chemical Co., Ltd.), 50% promethazine SC (Shandong Binnong Technology Co., Ltd.), 50% sulfentrazone SC (Jiangsu Ruibang Agrochemical Co., Ltd.), 61% isopropylamine·oxyfluorfen·promethazine SC (51.2% isopropylamine+2.8% oxyfluorfen+7% promethazine, Shandong Zhonghe Chemical Co., Ltd.) were used as controls A, B, C, and D, respectively. Specifically:

[0108] Test location: Urad Middle Banner, Bayannur City, Inner Mongolia

[0109] Planting time: May 18, 2024

[0110] Application time: May 20, 2024

[0111] Treatment area: The experiment set up 14 treatments and one blank control. The area of ​​each treatment was 300 square meters. Common grass weeds in the field were: crabgrass, barnyard grass, goosegrass, and foxtail grass. Common broad-leaved weeds in the field were: Amaranthus retroflexus, Purslane, Solanum nigrum, Kochia scoparia, Chenopodium album, Echinops edulis, Amaranthus chinensis, Ramulus flavosum, and Shepherd's purse, etc.

[0112] Survey date: July 19, 2024

[0113] The results are shown in Table 8.

[0114] Table 8

[0115]

[0116]

[0117] The results of the field test show that under the conditions of the field test, 60 days after the application, the application concentration of Example 5 (22% sulfamethoxazole·methanesulfonyl·promethazine SC) and Example 6 (66% sulfamethoxazole·methanesulfonyl·promethazine WP) is 330-660 g a.i. / ha, which is relatively safe for sunflowers, and the control effect on broad-leaved weeds can reach 96.1-100%, and the control effect on gramineous weeds can reach 95.8-100%; compared with the single agents of 40% sulfamethoxazole SC, 50% sulfamethoxazole SC and 50% promethazine SC, the compositions of Examples 5 and 6 have a synergistic effect on broad-leaved weeds, and the control effect on gramineous weeds is also significantly improved.

[0118] In the control agent Example 4 (22% pyrifos·ethoxy·promefen-butyl SC), the composition sulfentrazone was replaced with oxyfluorfen (a PPO enzyme inhibitor). Under the dosage condition of 330-660 g.i. / ha, the control effects of Example 4 and Example 5 were investigated 60 days after the application. However, the inhibitory rate of the agent 22% pyrifos·ethoxy·promefen-butyl SC in Example 4 on the plant height of sunflower was about 6.3%, and the yellowing of leaves was obvious, and the phytotoxicity was unacceptable.

[0119] In the control agent comparative example 5 (22% pyrifos·ethoxy·terbuthylazine SC), the composition of cypermethrin was replaced with terbuthylazine, an ingredient with the same mechanism of action, and sulfentrazone was replaced with oxyfluorfen-butyl, an agent with the same mechanism of action. Under the dosage condition of 330-660 ga.i. / ha, 60 days after the application, the protective effects of comparative example 5 and embodiment 5 were equivalent. However, at a high dosage, the agent 22% pyrifos·ethoxy·terbuthylazine SC in comparative example 5 had an inhibition rate of 11.5% on the plant height of sunflower, and the yellowing of leaves was obvious, and the phytotoxicity was unacceptable.

[0120] Compared with the comparative agent Comparative Example 6 (22% pyrifos·methanesulfonate·terbuthylazine SC), the composition prometryn is replaced with terbuthylazine. From Comparative Example 3, it can be seen that the single dose of terbuthylazine 150 g.i. / ha has a control effect of 52.0%, which is better than the single dose of prometryn 37.5% at the same dose. However, at the same dose of Composition Example 5 and Comparative Example 6, the field test results show that the composition of Example 5 exhibits a more excellent synergistic effect.

[0121] As for the other control agents on the market, 61% Isopropylamine SC at the recommended dose of 1373 ga.i. / ha has a control effect of 91.7% and 93.2% on broadleaf weeds and grass weeds respectively. At a dose of 2764 ga.i. / ha, the sunflower plant height inhibition rate was 8.2%, and the leaves showed yellowing. The control effect and safety were both inferior to 22% Isopropylamine SC.

[0122] It can be seen that compared with a single component or existing products, the composition of the present invention has significantly improved control effect and safety on broad-leaved weeds. Within a limited screening range, pyraclostrobin, sulfentrazone and promethazine have higher safety. Under the ratio of pyraclostrobin: sulfentrazone: promethazine = 8:4:10, the synergy is significant. The recommended dosage of 330-660 ga.i. / ha is outstanding in safety for sunflowers. It can be used as an agent for controlling weeds in the seedling stage of sunflower fields, and has good promotion and application value.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A herbicide composition for sunflower fields, characterized in that: The herbicide composition comprises 22% to 84% of herbicide active ingredients in terms of mass percentage, and the remainder is pesticide-acceptable adjuvants; wherein the herbicide active ingredients are composed of pyraclostrobin, sulfentrazone and promethazine.

2. The herbicide composition for sunflower fields according to claim 1, characterized in that: Measured by mass percentage of the herbicide active ingredient, it includes: 8% to 24% of sulfamethoxazole, 4% to 15% of sulfentrazone, and 10% to 45% of promethazine.

3. The herbicide composition for sunflower fields according to any one of claims 1 or 2, characterized in that: The mass ratio of pyraclostrobin, sulfentrazone and promethazine is 8:4-5:10-15.

4. The herbicide composition for sunflower fields according to claim 3, characterized in that: The mass ratio of pyraclostrobin, sulfentrazone and promethazine is 8:4:

10.

5. The herbicide composition for sunflower fields according to claim 1, characterized in that: The pesticide-acceptable adjuvants include pesticide-acceptable surfactants and pesticide-acceptable carriers.

6. The herbicide composition for sunflower fields according to claim 5, characterized in that: The dosage form of the herbicide composition includes one of a suspension concentrate, a dispersible oil suspension concentrate, a microcapsule suspension concentrate, a water dispersible granule, and a wettable powder.

7. The herbicide composition for sunflower fields according to any one of claims 1 to 6, characterized in that: The herbicide composition is used for controlling broadleaf weeds and grass weeds in sunflower fields.

8. The herbicide composition for sunflower fields according to claim 7, characterized in that: The herbicide composition is applied to the sunflower field at a dosage of 330 to 660 g.i. / ha.

9. The herbicide composition for sunflower fields according to claim 8, characterized in that: After the herbicide composition is applied to a sunflower field, the growth of sunflowers is safe, and the duration of drug efficacy is greater than 60 days.

10. The herbicide composition for sunflower fields according to claim 9, characterized in that: The herbicide composition is applied to a sunflower field, and the control efficiency of the broadleaf weeds is 96.1-100%, and the control efficiency of the gramineous weeds is 95.8-100%.

Images