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CN115053911B - Herbicide composition containing fenpyrad and pinoxaden - Google Patents

Herbicide composition containing fenpyrad and pinoxaden Download PDF

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CN115053911B
CN115053911B CN202210869478.2A CN202210869478A CN115053911B CN 115053911 B CN115053911 B CN 115053911B CN 202210869478 A CN202210869478 A CN 202210869478A CN 115053911 B CN115053911 B CN 115053911B
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wheat
weeds
pinoxaden
herbicide composition
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CN115053911A (en
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徐洪乐
薛飞
苏旺苍
孙兰兰
吴仁海
李秀杰
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Institute of Plant Protection of Henan Academy of Agricultural Sciences
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
    • A01N43/80—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protection of plants
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00—Cultivation of specific crops or plants not otherwise provided for
    • A01G22/20—Cereals
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
    • A01N43/56—1,2-Diazoles; Hydrogenated 1,2-diazoles
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/90—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having two or more relevant hetero rings, condensed among themselves or with a common carbocyclic ring system
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
    • A01N47/36—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
    • A01P13/00—Herbicides; Algicides

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Wood Science & Technology (AREA)
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  • Agronomy & Crop Science (AREA)
  • General Chemical & Material Sciences (AREA)
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  • Chemical & Material Sciences (AREA)
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  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

The invention discloses a herbicide composition containing fenpyrad and pinoxaden, which comprises a weeding active ingredient A, a weeding active ingredient B and a safety active ingredient C; the weeding active ingredient A is fenpyrazamine, the weeding active ingredient B is pinoxaden, and the safety active ingredient C is pyraclostrobin; the mass ratio of the weeding active ingredient A to the weeding active ingredient B to the safety active ingredient C is 2-6:1-2:1-3. The herbicide composition is sprayed on early wheat seedlings and leaves at 1-2 leaf stages of weeds, can effectively prevent and remove drug-resistant weeds in wheat fields, particularly resistant gramineae weeds such as Japanese wheat, and has good safety to wheat and excellent prevention and control effects.

Description

Herbicide composition containing fenpyrad and pinoxaden
Technical Field
The invention belongs to the technical field of pesticides, and particularly relates to a herbicide composition containing fenpyrad and pinoxaden. The herbicide composition comprises a weeding active ingredient A, a weeding active ingredient B and a safety active ingredient C. The active ingredient A is fenpyrazamine, the active ingredient B is pinoxaden or mesosulfuron, and the active ingredient C is pyraclostrobin.
Background
Farmland weeds are a type of pest that severely threatens crop growth. Weeds compete with wheat for illumination, moisture, nutrients and the like, and the safe production of the wheat is seriously affected. Herbicides are the most economical and effective means of controlling weed damage in modern agricultural production; however, with the unscientific use of herbicides, various problems such as drug resistance of weeds, frequent occurrence of wheat phytotoxicity and the like are brought. Therefore, development of herbicide composition which can effectively prevent and remove resistant weeds and is safe for wheat has important significance in optimizing herbicide application technology.
Pyroxasulfuron (Pyroxasulfuron) of formula C 12 H 14 F 5 N 3 O 4 S, chemical name is 3- [5- (difluoromethoxy) -1-methyl-3- (trifluoromethoxy) pyrazol-4-ylmethyl sulfonyl]-4, 5-dihydro-5, 5-dimethyl-1, 2-isoxazole. The fenpyrazamine is an isoxazole herbicide and has the effect of inhibiting plant cell division. The herbicide is discovered by Japanese K-I chemical research at the earliest, and then industrialization is realized by combining Japanese combinatorial chemistry with Japanese fomentation chemistry. The haloxyfop-R-methyl is mainly used for preventing and removing various gramineous weeds by soil spraying. The structural formula is as follows:
pinoxaden (Pinoxaden), formula C 23 H 32 N 2 O 4 The chemical name is 8- (2, 6-diethyl-4-methylphenyl) -1,2,4, 5-tetrahydro-7-oxo-7H-pyrazolo [1,2-d][1,4,5]Oxadiazepin-9-yl 2, 2-dimethylpropionate. Pinoxaden is a phenylpyrazoline herbicide and the target of action is acetyl-CoA carboxylase of a plant. Pinoxaden can cause the inhibition of plant fatty acid synthesis, stop cell division, and cause plant death. The agent has systemic transmissibility, and is mainly used for preventing and removing various gramineous weeds by spraying after seedling stem and leaf. The structural formula is as follows:
mesosulfuron-methyl (Mesosulfuron-methyl) of formula C 17 H 21 N 5 O 9 S 2 The chemical name is 2- [3- (4, 6-dimethoxy pyrimidine-2-yl) carbamide sulfonyl]-methyl 4-methanesulfonamide benzoate. Mesosulfuron is a sulfonylurea herbicide, and the action target is acetolactate synthase of plants. The plant is mainly absorbed by stems and leaves of plants, is conducted through phloem and xylem, inhibits the activity of acetolactate synthase in sensitive plants, leads to the synthesis of branched chain amino acid to be blocked, inhibits cell division, leads to the death of the sensitive plants, and is mainly used for preventing and killing various gramineous weeds and part of broadleaf weeds by post-emergence stem and leaf spraying. The structural formula is as follows:
mefenpyr-diethyl (Mefenpyr-diethyl) with molecular formula of C 16 H 18 Cl 2 N 2 O 4 The chemical name is 1- (3, 4-dichlorophenyl) -5-methyl-2-pyrazoline-3, 5-diethyl diformate. Pyraclostrobin is a pyrazole safener developed by Anvant corporation, and can protect wheat, barley, etc. from herbicide injury when used together with herbicide. The structural formula is as follows:
in order to solve the practical problems in agricultural production, the invention provides the herbicide composition containing the fenpyrazamine, pinoxaden or mesosulfuron-methyl and the pyraclostrobin by combining the characteristics of different herbicides.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a herbicide composition containing fenpyrad, pinoxaden or mesosulfuron and pyraclostrobin. The herbicide composition is sprayed on early wheat seedlings and leaves at 1-2 leaf stages of weeds, can effectively prevent and remove drug-resistant weeds in wheat fields, particularly resistant gramineae weeds such as Japanese wheat, and has good safety to wheat and excellent prevention and control effects.
The invention is realized by the following technical proposal
A safe and efficient herbicide composition for controlling drug-resistant weeds in wheat fields, which comprises the following components in percentage by mass of 1-60:1-20:1-20, a herbicidal active ingredient a, a herbicidal active ingredient B and a safety active ingredient C; the weeding active ingredient A is fenpyrazamine, the weeding active ingredient B is pinoxaden or mesosulfuron-methyl, and the safety active ingredient C is pyraclonil.
Further, when the herbicidal active ingredient B is pinoxaden, the mass ratio of the herbicidal active ingredient a, the herbicidal active ingredient B and the safety active ingredient C is 2 to 6:1-2:1-3; when the weeding active ingredient B is the mesosulfuron, the mass ratio of the weeding active ingredient A to the weeding active ingredient B to the safety active ingredient C is 12-60:1-2:1-4.
Furthermore, the herbicide composition also comprises auxiliary materials (such as auxiliary agents and/or additives) allowed by pesticides; the auxiliary materials are selected from one or more than two of wetting agents, dispersing agents, fillers, emulsifying agents, disintegrating agents, stabilizing agents, defoaming agents, thickening agents, antifreezing agents and solvents.
In particular, the sum of the weights of the active ingredients A and B in the herbicide composition according to the invention is from 5 to 90%, particularly preferably from 20 to 50%, of the total weight of the herbicide composition.
The invention provides a safe and efficient herbicide composition for preventing and controlling drug-resistant weeds in wheat fields, which comprises the following raw materials in percentage by weight: 20% of penoxsulam, 1-10% of pinoxaden or mesosulfuron-methyl, 2-10% of pyraclostrobin, 2-3% of pesticide emulsion 600#, 1-2% of diisooctyl succinate sodium sulfonate, 1-3% of methylene dinaphthyl sodium sulfonate, 2-3% of gelatin, 10-12% of ethylene glycol, 2-3% of lignin calcium carbonate and the balance of water.
The invention provides a safe and efficient herbicide composition for preventing and controlling drug-resistant weeds in a wheat field, which is characterized by comprising the following raw materials in percentage by weight: 18-45% of penoxsulam, 1-6% of pinoxaden or mesosulfuron, 3-12% of pyraclostrobin, 5-6% of sodium methylene dinaphthyl sulfonate, 4% of fatty alcohol polyoxyethylene ether, 5-6% of NP-710, and the balance of methyl oleate.
The invention also provides application of the safe and efficient herbicide composition in preventing and killing weeds in a wheat field, and specifically comprises the following steps: the safe and efficient herbicide composition is sprayed in early post-emergence period of wheat and when weeds are in 1-2 leaf periods so as to prevent and remove drug-resistant gramineous weeds such as Japanese wheat physalis alkekengi.
Compared with the prior art, the herbicide composition has the following beneficial effects:
the herbicide composition can effectively prevent and remove resistant weeds in wheat fields, particularly resistant grassy weeds such as Japanese wheat-plant, the resistance of the wheat-plant weeds to the herbicide is common, and particularly the resistance of the wheat-plant weeds such as Japanese wheat-plant, japanese wheat-plant and wheat-plant can be serious to fenoxaprop-p-ethyl and clodinafop-propargyl. The fenpyrazamine belongs to isoxazole herbicides, is a wheat Tian Xinxing closed herbicide, and has remarkable effect on various drug-resistant weeds. The pinoxaden and the mesosulfuron are respectively phenylpyrazoline herbicides and sulfonylurea herbicides, and the two herbicides have excellent control effect on drug-resistant weeds. The selection of efficient herbicides with completely different mechanisms of action is an important strategy for controlling weed resistance and delaying the occurrence of weed resistance. According to the occurrence of weed resistance, any one of pinoxaden and mesosulfuron is selected to be matched with the metazachlor for weed control, so that the weeding composition can effectively control resistant weeds.
The herbicide composition disclosed by the invention is high in safety. The herbicide can effectively prevent and remove weeds and is extremely easy to cause phytotoxicity to crops. The haloxyfop-methyl, pinoxaden and mesosulfuron are easy to cause phytotoxicity if used improperly, and especially the conditions of unscientific drug application apparatus, low-temperature ponding and the like are met. According to the herbicide composition, the safety of the composition on wheat is improved by adding the safener pyraclonil, so that the occurrence of wheat phytotoxicity is effectively avoided, the safe production of wheat is ensured, and weeds are effectively prevented and removed.
The herbicide composition provided by the invention has an excellent control effect. The control effect is excellent in two aspects, and the first, the penoxsulam and the pinoxaden or the mesosulfuron are combined in a reasonable proportion to have a synergistic effect on preventing and killing the weeds which have emerged. Secondly, the fenpyrazamine is mainly used for preventing and removing weeds through soil sealing, and has poor prevention effect on the seedlings. The pinoxaden and the mesosulfuron are treated by the stem and leaf to prevent and remove the weeds which have emerged, and the effect is excellent. The weeds in the wheat fields can continuously emerge, and the conventional method simply adopts soil treatment, so that the effect of the weeds in the later-stage emergence is poor due to the limited duration of the medicament; and the simple stem and leaf treatment is easy to cause weeping prevention of later-stage seedling emergence, and the overall prevention effect is not ideal. The herbicide composition selects soil treatment herbicide and is matched with stem and leaf treatment herbicide to be applied in combination in the 1-2 leaf period of weeds, so that the herbicide composition has the sealing effect of soil treatment, the inner sucking contact killing effect of stem and leaf treatment and excellent overall control effect.
Detailed Description
The present invention will be described in more detail by way of specific examples, which should not be construed as limiting the scope of the invention.
Example 1
The herbicide composition containing the penoxsulam, the pinoxaden and the pyraclostrobin is prepared from the following components in parts by weight: 20% of metazachlor, 10% of pinoxaden, 10% of pyraclostrobin, 2.5% of agro-emulsion 600#, 1% of sodium diisooctyl succinate sulfonate, 1.5% of sodium methylene dinaphthyl sulfonate, 3% of gelatin, 12% of ethylene glycol, 2% of lignin calcium carbonate and the balance of water to 100%.
The suspending agent with the active ingredient mass percent of 30 percent is prepared according to the conventional preparation method.
Example 2
The herbicide composition containing the haloxyfop-methyl, the mesosulfuron-methyl and the pyraclonil is prepared from the following components in parts by weight: 20% of pyrazosulfuron-ethyl, 1% of mesosulfuron-methyl, 2% of pyraclostrobin, 3% of agro-emulsion 600#, 2% of sodium diisooctyl succinate sulfonate, 2.5% of sodium methylene dinaphthyl sulfonate, 2% of gelatin, 10% of ethylene glycol, 2.5% of lignin calcium carbonate and the balance of water to 100%.
The suspending agent with the active ingredient mass percent of 21 percent is prepared according to the conventional preparation method.
Example 3
The herbicide composition containing the penoxsulam, the pinoxaden and the pyraclostrobin is prepared from the following components in parts by weight: 18% of fenpyrad, 6% of pinoxaden, 12% of pyraclostrobin, 5% of methylene dinaphthyl sodium sulfonate, 4% of fatty alcohol polyoxyethylene ether, NP-710%, 5% of bentonite and 100% of methyl oleate.
The oil suspending agent with the active ingredient mass percent of 24% is prepared according to the conventional preparation method.
Example 4
The herbicide composition containing the haloxyfop-methyl, the mesosulfuron-methyl and the pyraclonil is prepared from the following components in parts by weight: 45% of pyrazosulfuron-ethyl, 1.5% of mesosulfuron-methyl, 3% of pyraclostrobin, 6% of sodium methylene dinaphthyl sulfonate, 4% of fatty alcohol polyoxyethylene ether, NP-712%, 6% of bentonite and 100% of methyl oleate.
The oil suspending agent with the active ingredient mass percent of 46.5 percent is prepared according to the conventional preparation method.
Application test 1: use of a herbicide composition for controlling weeds:
firstly, weeding tests are carried out on two active ingredients of the penoxsulam and the pinoxaden and the penoxsulam and the mesosulfuron under the greenhouse potting condition so as to evaluate the weeding effect of the two ingredient combination. The specific implementation is as follows.
Test agent solution: the raw materials of the fenpyrad and the pinoxaden are accurately weighed according to the dosage of the table 1, the raw materials of the fenpyrad and the mesosulfuron are accurately weighed according to the dosage of the table 2, the raw materials are dissolved by proper amount of acetone (the active medicine can be completely dissolved by the acetone), and then the raw materials are added into an aqueous solution containing 0.1 weight percent of Tween 80 emulsifier, and the mixture is stirred uniformly to prepare a solution containing a certain active ingredient content. Blank control was solution treatment: an equal amount of acetone was added to an equal amount of 0.1% aqueous solution of tween 80 emulsifier.
The test method comprises the following steps: the activity of the single medicine and the mixed medicine on Japanese alopecuroide is tested by using the Gowing method. The plastic pot with the height of 10cm and the diameter of 7cm is filled with a certain amount of soil, seeds of each weed to be tested are uniformly sown in the plastic pot, 20 seeds are sown in each plastic pot, the soil with the thickness of 0.5 is covered, and the seeds are cultivated in a greenhouse (20 ℃ in daytime and 10 ℃ at night). And after the weeds are regularly planted, each pot is fixed to 15 plants, and the greenhouse culture is continued. When weeds grow to 2 leaves, the prepared liquid medicine is subjected to stem leaf spraying treatment, the specific treatment doses are shown in tables 1 and 2, the solution treatment is used as a blank control, and each treatment is repeated for 4 times. The stem and leaf spray is sprayed by a 3WP-2000 walking spray tower of Nanjing agricultural mechanical institute of agricultural. After treatment, the test material is placed in a greenhouse for continuous culture, the growth condition of weeds is observed periodically, the fresh weight of overground parts is weighed after 21 days, and the fresh weight inhibition rate (%) is calculated.
The mode of action of the herbicide combination was evaluated according to the Gowing method, and the formula is as follows:
e (%) = (control fresh weight-treated fresh weight)/control fresh weight x 100
E 0 (％)＝X+Y×(100-X)/100
C＝E-E 0
Wherein E is 0 The herbicide is a theoretical prevention effect on weed inhibition after two active ingredients are mixed; e is the actual measurement prevention effect of weed inhibition after the two active components are mixed; x is the prevention effect of the fenpyrad on target weeds at the dosage; y is the control effect of mesosulfuron-methyl or pinoxaden on target weeds at the dosage; c is the joint action coefficient of the mixed preparation and is used for evaluating the synergistic effect of the two active ingredients; when C is more than 10, the synergism is achieved, when C is less than 10, the antagonism is achieved, and when C is less than 10, the antagonism is achieved.
Table 1 results of green test of herbicidal Activity against Japanese Myrtle by different ratios of Pyrazol sulfone and pinoxaden
From the above data in table 1, it can be seen that: after the penoxsulam and the pinoxaden are compounded, the anti-theft effect on Japanese alopecuroide is good, and after the two components are compounded, the synergistic effect is remarkable within a certain proportion range (3:1-2:1).
Table 2 results of green test of herbicidal Activity of Pyricularia sulfone and Methyldisulfuron in different ratios against Japanese hyperforin
From the above data in table 2, it can be seen that: after the pyrazosulfuron-ethyl and the mesosulfuron-methyl are compounded, the anti-flammule is good, and after the two components are compounded, the synergistic effect is remarkable within a certain proportion range (30:1-40:3).
Application test 2: the field efficacy test of the herbicide composition.
Test crop: wheat (Zhengmai 103).
Control object: japan wheat (grass weed).
The test method comprises the following steps: the herbicide composition prepared by the invention is subjected to field efficacy test by referring to the pesticide field efficacy test criterion. Test treatments and numbers are shown in table 3. The area of the cell used for the test was 20m 2 And repeating for 4 times, wherein the cultivation conditions (soil, fertility, growth stage and crop row spacing) of all the test cells are uniform, and the cells of the test agent and the blank control are arranged in a random block mode. And carrying out chemical soil fog treatment in early postemergence period of wheat and in 1-2 leaf period of weeds. The plant control effect and fresh weight control effect of weeds are investigated 60 days after the pesticide, pesticide injury is graded, and 10m of weeds are collected in each district during harvesting 2 And (5) measuring the yield. The statistical results are shown in tables 3 and 4.
Plant/fresh weight control (%) = (control zone weed plant/fresh weight-treatment zone weed plant/fresh weight)/control zone weed plant/fresh weight
Yield increase (%) = (treatment zone yield-control zone yield)/control yield
Wherein, the grading standard of the herbicide composition on the safety of wheat is as follows:
grade 1, the crops grow normally, and no victim symptoms exist;
grade 2, slight phytotoxicity of crops, wherein the phytotoxicity is less than 10%;
grade 3, the pesticide injury of crops and the like can be recovered later;
grade 4, the crop injury is heavier, and recovery is difficult;
grade 5, serious phytotoxicity of crops and no recovery.
Table 3 test number and treatment
Table 4 field control effect and safety of herbicide composition
Note that: the control effect in the table is a 4-time repeated average value; ab c represents the significance of the difference between treatments at the p=0.05 level, respectively
From the test results in Table 4, it can be seen that: in field experiments, the control effect of different medicament treatments on Japanese alopecias is good, no obvious difference exists between the different medicament treatments (treatments 1-6), but the control effect of the medicament treatments is obviously higher than that of manual weeding. The treatments 2, 3,5 and 6 all cause phytotoxicity to wheat, and particularly the phytotoxicity grade of the treatments 2 and 5 without adding the safener is up to grade 3, and the phytotoxicity is heavier. Therefore, the herbicide composition has excellent control effect, and has excellent safety by adding a certain proportion of safener.
TABLE 5 effect on wheat yield after application of different treatments
Note that: ab c in the above table represents the significance of the difference between treatments at the p=0.05 level, respectively
From the test results in Table 5, it can be seen that: in the field efficacy test, the yield increasing effect of the wheat is different by different chemical treatments. Among them, treatment 1 and treatment 4 (example 1, example 2) showed the best synergistic effect, and the synergistic rate reached 12.18% and 11.40%, respectively. And the treatment 2 and the treatment 5 without adding the safener pyraclonil cause the yield reduction of wheat and serious phytotoxicity. Thus, the herbicide composition provided by the invention has excellent safety.
Application test 3: the field efficacy test of the herbicide composition.
Test crop: wheat (Zhengmai 103).
Control object: resistant grass weed japanese barley grass.
The test method comprises the following steps: the herbicide composition prepared by the invention is subjected to field efficacy test by referring to the pesticide field efficacy test criterion. The treatment and dosage are shown in Table 6. The area of the cell used for the test was 20m 2 And repeating for 4 times, wherein the cultivation conditions (soil, fertility, growth stage and crop row spacing) of all the test cells are uniform and consistent, and the cells are arranged in random groups. The pesticide soil fog treatment is carried out on the wheat before sowing, 3 days before seedling sowing and 1-2 leaf stage of the weeds after seedling sowing. The plant control and fresh weight control of weeds were investigated 120 days after the pesticide and the pesticide injury was classified (classification standard is the same as in example 6). The specific results are shown in Table 6.
TABLE 6 control effect of different treatments on Japanese wheat and safety of wheat
From the test results in Table 6, it can be seen that: the control effect of the same chemical treatment on resistant Japanese wheat plants in the field efficacy test is different from that of the chemical treatment on resistant Japanese wheat plants, and the safety of the resistant Japanese wheat plants on the resistant Japanese wheat plants is different from that of the resistant Japanese wheat plants. In treatments 1-3 and treatments 4-6, the same treatment dosage and different application periods, the spraying agent for 1-2 leaf period of post-emergence weeds has the best control effect on resistant Japanese alopecias. The control effect of the resistant Japanese alopecuroide in treatment 3 and treatment 6 is superior to that of the control agents of fenpyrad, pinoxaden, mesosulfuron-methyl and fenoxaprop-p-ethyl. Compared with the traditional herbicide, the herbicide composition has more excellent control effect, is applied in the 1-2 leaf period of post-emergence weeds, and has the most obvious application effect and best safety.

Claims (1)

1. Use of a herbicide composition containing fenpyrad and pinoxaden for combating japanese physalis, characterized in that the herbicide composition comprises a herbicidal active ingredient a, a herbicidal active ingredient B and a safety active ingredient C; the weeding active ingredient A is fenpyrazamine, the weeding active ingredient B is pinoxaden, and the safety active ingredient C is pyraclostrobin; the mass ratio of the weeding active ingredient A to the weeding active ingredient B to the safety active ingredient C is 2-6:1-2:1-3.
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