CN102265850B - Weeding composition containing bentazone, clopyralid and atrazine, and application thereof - Google Patents

Abstract

The invention discloses a herbicidal composition containing bentazone, clopyralid and atrazine and its application. The herbicidal composition uses bentazone, clopyralid and atrazine as main active ingredients, and The mass ratio of grass pine, clopyralid and atrazine is 1-70:1-60:1-60. The application of the herbicidal composition of the present invention in post-emergence weeding in corn fields, especially in the control of gramineous and broad-leaved weeds in corn fields has remarkable effects. Compared with a single dose, the herbicidal composition of the present invention delays weed resistance, has a wide herbicidal spectrum, long duration of action, and is safe to corn and subsequent crops under the premise of improving the efficacy of a single agent.

Description

A herbicidal composition containing bentazone, clopyralid and atrazine and its application

technical field

The invention belongs to the technical field of pesticides, in particular to the field of herbicides, and specifically relates to a three-component compound herbicidal composition of bentazone, clopyralid and atrazine. The herbicidal composition can be applied to post-emergence weeding in corn fields.

Background technique

Mechasong, also known as Paicaodan and Bendasone. Chemical name: 3-isopropyl-(1H)-benzo-2,1,3-thiadiazin-4-one-2,2-dioxide, the structural formula is:

The herbicide is a contact-type selective post-emergence herbicide, which is used for the treatment of stems and leaves at the seedling stage, and works through leaf contact. When used in dry fields, it first penetrates into the chloroplast through the leaf surface to inhibit photosynthesis. The use of paddy fields can not only penetrate through the leaves but also absorb through the roots, and then transmit to the stems and leaves, which strongly hinders the photosynthesis and water metabolism of weeds, causes nutrient starvation, and causes physiological dysfunction and death. The active ingredients are detoxified by metabolizing to weakly active sugar conjugates in tolerant crops, which is safe for crops, and bentazone can be decomposed by microorganisms in the soil 6-18 weeks after application. However, bentazone is ineffective against grass weeds, and the weeding spectrum is single.

Atrazine, also known as Alatzine, a s-triazine herbicide, scientific name 2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine, its structural formula :

Atrazine is a selective systemic conduction type pre-emergence and post-emergence herbicide. It is mainly absorbed by roots, with little absorption by stems and leaves. It is quickly transmitted to plant meristems and leaves, interfering with photosynthesis and killing weeds. In resistant crops such as corn, it is decomposed by corn ketonease to produce non-toxic substances, so it is safe for corn and the like. It has a wide herbicidal spectrum and can control a variety of annual grasses and broadleaf weeds. Since atrazine is mainly absorbed by roots, it is difficult to completely kill weeds when the density of weeds is high or the plants are large. Moreover, many weeds have developed serious resistance to it.

Clopyralid (clopyralid), chemical name: 3,6-dichloropyridine-2-carboxylic acid, its structural formula is as follows:

Clopyralid is a pyridine herbicide. After application to weeds, it is absorbed by the leaves or roots, moves up and down in the plant, and quickly spreads to the whole plant. Its herbicidal mechanism is to promote the formation of plant nucleic acids. , Excessive ribonucleic acid is produced, resulting in excessive root growth, deformed stem and leaf growth, nutrient consumption, and vascular bundle transport function being blocked, leading to the death of weeds. It is suitable for corn fields and wheat fields, and can effectively control weeds of Asteraceae, Leguminosae, Solanaceae and Umbelliferae. Clopyralid is selective in gramineous crops and is equally selective in a variety of broadleaf crops including Brassic and other sugar beet crops, flax, strawberry and allium crops. Its broad herbicidal spectrum can effectively control annual weeds and deep-rooted perennial weeds. However, its herbicidal spectrum is relatively narrow, and it is ineffective against field bindweed, etc., and it is difficult to completely kill broad-leaved weeds in corn fields.

At present, herbicides in cornfields are limited by the safety of crops, and their herbicidal spectrum is also limited. Using a single herbicide alone cannot completely and effectively control the occurrence of weeds in cornfields. If the effective period is too long, the dosage is too large or the application is uneven, it will easily cause residual toxicity to the crops of the current season or the subsequent crops. Therefore, the present invention selects three kinds of herbicides, which have different herbicide spectrums and complementary advantages and disadvantages, such as bentazone, clopyralid and atrazine, and then make a mixture for use after appropriate reduction. It not only improves the herbicidal effect, but also avoids the possibility of phytotoxicity to current crops and residual toxicity to subsequent crops.

Invention content:

The object of the present invention is to provide a herbicidal composition containing bentazone, clopyralid and atrazine.

Another object of the present invention is to provide the application of the herbicidal composition in cornfield weeding.

A herbicidal composition containing bentazone, clopyralid and atrazine, characterized in that the herbicidal composition uses bentazone, clopyralid and atrazine as main active ingredients, and bentazone, clopyralid The mass ratio of clopyralid and atrazine is 1～70:1～60:1～60, preferably the mass ratio of bentazone, clopyralid and atrazine is 1～40:1～50:1～ 40, most preferably 1-10:1-10:1-15.

In the herbicidal composition, the mass percent content of bentazone, clopyralid and atrazine in the herbicidal composition is 1-85%, preferably 20-75%.

In the ternary compound composition of bentazone, clopyralid and atrazine of the present invention, in addition to active ingredients such as bentazone, clopyralid and atrazine, other pesticides allowed in pesticide formulations can also be added. Adjuvants such as conventional surfactants, thickeners, solvents or solid fillers are formulated into any dosage form allowed on pesticides. It is preferably processed into suspension concentrate, emulsifiable concentrate, water dispersible granule, wettable powder, water emulsion, etc.

The herbicidal composition of the present invention can be used in post-emergence weeding in corn fields, especially in controlling various gramineous and broad-leaved weeds in corn fields, and has remarkable effects.

The herbicidal composition of the present invention has the following advantages:

1. High herbicidal activity. The herbicidal composition of the present invention can kill weeds through three different mechanisms, so that the speed of weed resistance generation is reduced, and the herbicidal activity of the herbicide is greatly improved.

2. Broad herbicide spectrum and long duration. The herbicidal spectrum of the three herbicides is different, and the herbicidal spectrum and activity of the three herbicides are mixed together to make the herbicidal spectrum of the mixed preparation wider and the duration of effect longer.

3. Delay weed resistance. The invention can significantly improve the control effect on various resistant weeds, delay the emergence of weed resistance and prolong the service life of the medicament.

4. High security. The herbicidal composition of the present invention is applied to post-emergence weeding in corn fields, can prevent and control various gramineous and broad-leaved weeds in corn fields, and has safety for corn and subsequent crops under the premise of improving the efficacy.

Therefore, the herbicidal composition of the present invention can be used in the preparation of herbicides for post-emergence weeding in corn fields, especially in the application of herbicides for controlling gramineous and broad-leaved weeds in corn fields.

Detailed ways

Example 1

Benazone 10%, Atrazine 28%, Clopyralid 2%, Alkylphenol Polyoxyethylene Ether 4%, Polyoxyethylene Polyoxypropylene Block Compound 5%, Xanthan Gum 2%, Water to make up 100%, according to the routine preparation method, be mixed with the suspending agent that mass percent composition is 40%.

Example 2

Benazone 8%, Atrazine 15%, Clopyralid 2%, Calcium Dodecyl Benzene Sulfonate 9%, Alkylphenol Polyoxyethylene Ether 5%, Xylene to 100%, according to conventional preparations The method is to prepare an emulsifiable concentrate with a mass percentage of 25%.

Example 3

Benazone 60%, Atrazine 10%, Clopyralid 5%, Sodium Lignosulfonate 7%, Sodium Dodecylbenzenesulfonate 5%, Ammonium Sulfate 5%, Diatomaceous Earth Top Up 100%, The water-dispersible granules with a mass percent content of 75% are formulated according to conventional preparation methods.

Example 4

Benedazone 20%, Atrazine 35%, Clopyralid 10%, NNO (Sodium Methylenebissulfonate) 9%, Sodium Lignosulfonate 7%, White Carbon 9%, Kaolin Supplement 100 %, according to the conventional preparation method, it is formulated into a wettable powder with a mass percent content of 65%.

Example 5

Benazone 29%, Atrazine 1%, Clopyralid 10%, Alkylphenol Polyoxyethylene Ether 4%, Polyoxyethylene Polyoxypropylene Block Compound 5%, Xanthan Gum 2%, Water to make up 100%, according to the routine preparation method, be mixed with the suspending agent that mass percent composition is 40%.

Example 6

Benazone 1%, Atrazine 10%, Clopyralid 14%, Sodium Naphthalene Sulfonate Formaldehyde Condensate 6%, Nonylphenol Polyoxyethylene Ether 3%, Magnesium Aluminum Silicate 0.5%, Ethylenedi 7% of alcohol, 2% of tributyl phosphate, 20% of mineral spirits, and 100% of water are formulated into a water emulsion with a mass percentage of 15% according to a conventional preparation method.

Example 7

Benazone 60%, Atrazine 14%, Clopyralid 1%, Sodium Lignosulfonate 7%, Sodium Dodecylbenzenesulfonate 5%, Ammonium Sulfate 5%, Diatomaceous Earth Top Up 100%, The water-dispersible granules with a mass percent content of 75% are formulated according to conventional preparation methods.

Example 8

Benazone 20%, Atrazine 40%, Clopyralid 15%, Sodium Lignosulfonate 7%, Sodium Dodecyl Benzene Sulfonate 5%, Ammonium Sulfate 5%, Diatomaceous Earth Supplement 100%, The water-dispersible granules with a mass percent content of 75% are formulated according to conventional preparation methods.

Example 9

Atrazine 15%, Benazone 10%, Clopyralid 50%, Sodium Lignosulfonate 7%, Sodium Dodecylbenzenesulfonate 5%, Ammonium Sulfate 5%, Diatomaceous Earth Supplement 100%, The water-dispersible granules with a mass percent content of 75% are formulated according to conventional preparation methods.

Example 10

Benazone 1%, Atrazine 60%, Clopyralid 15%, Sodium Lignosulfonate 7%, Sodium Dodecyl Benzene Sulfonate 5%, Ammonium Sulfate 5%, Diatomaceous Earth Supplement 100%, The water-dispersible granules with a mass percent content of 61% were prepared according to conventional preparation methods.

Example 11

1), indoor activity determination test

Utilizing the preparations of Examples 1-4, their co-toxicity coefficients to commelina common weeds in cornfields were determined.

Test method: Quantitatively sow the seeds of Commelina officinalis in 9cm disposable paper cups, sow 10-15 seeds in each cup, and cultivate them in the light incubator. Spray treatment on track crop sprayer. Continue to cultivate in the greenhouse after treatment, regularly observe the control effect of each treatment on weeds, weigh the fresh weight of weeds after each treatment after 30 days, and calculate its toxicity regression curve and co-toxicity coefficient according to the method proposed by Sun Yunpei et al. in 1960 . A co-toxicity coefficient greater than 100 indicates that the two effective substances have a synergistic effect, and a co-toxicity coefficient of less than 100 indicates that the two effective substances have an antagonistic effect. The measurement results are shown in Table 1.

Table 1 Indoor activity measurement results

The above results fully demonstrate that the compound formulation of bentazone, clopyralid and atrazine has a significant synergistic effect on the control of Commelina.

2), field efficacy test:

Drugs for testing:

Four kinds of ternary compound herbicides in Examples 1-4.

Comparative drug:

25% bentazone aqueous solution (commercially available), 360g/l atrazine emulsifiable concentrate (commercially available), 24% clopyralid aqueous solution (commercially available).

Test crops: corn

The corn seedlings are in the 3-6 leaf stage, and the growth is good, the plants are strong, and there are no other diseases and insect pests.

Prevention object:

Broad-leaved weeds and grass weeds: dominant weeds in corn fields such as barnyardgrass, foxtail, commelina, velvetleaf and amaranth.

experiment method:

Accurately weigh various agents according to the area of the test plot, and after diluting with water, use a knapsack sprayer to spray evenly, and the nozzles are herbicide-specific fan-shaped nozzles. When spraying, pay attention to spraying the liquid medicine evenly into the test area, so that there is no leakage or overspray.

After the test, weed death was observed at 20 days and 40 days after application, and the herbicidal activities of various agents were compared. In addition, it is necessary to observe the production of crops within 1-15 days after application (the dosage is the amount of active ingredients per mu of land) to investigate whether the pesticide has phytotoxicity on the crops.

The herbicidal test effects of the preparations of the embodiments of the present invention are shown in Table 2 (after 20 d) and Table 3 (40 d) below.

20 days drug efficacy result after table 2 application

treatment agent Amount (ga.i./mu) Poaceae control effect (%) Broad-leaved weed control effect (%) Total control effect (%) Example 1 50 96 93 94 Example 2 50 93 90 91 Example 3 50 95 92 94 Example 4 50 94 93 93 38% Atrazine Suspension Concentrate 150 88 79 84 25% bentazone liquid 100 - 88 49 30% Clopyralid Aqueous Solution 30 - 84 49

40 days drug effect result after table 3 application

treatment agent Amount (ga.i./mu) Poaceae control effect (%) Broad-leaved weed control effect (%) Total control effect (%) Example 1 50 90 88 89 Example 2 50 91 89 90 Example 3 50 92 87 90 Example 4 50 87 90 88 38% Atrazine Suspension Concentrate 150 73 69 70 25% bentazone liquid 100 - 72 35 30% Clopyralid Aqueous Solution 30 - 69 31

It can be seen from Table 2 and Table 3 that the present invention has significant control effects on grass weeds and broad-leaved weeds, with remarkable synergistic effect and long-lasting effect.

Table 4 The results of the investigation of the safety of pesticides on crops

The corn growth in each treatment plot is good, except that the corn leaves in the 24% clopyralid water treatment area have burning drug spots, and no drug spots are seen in other treatment plots, which shows that the compound agent of the present invention is effective on corn. All safe.

Claims (8)

1. Herbicidal combinations that contains bentazone, clopyralid and atrazine, it is characterized in that this Herbicidal combinations take bentazone, clopyralid and atrazine as active ingredient, the mass ratio of bentazone, clopyralid and atrazine is 1～70:1～60:1 ~ 60.

2. Herbicidal combinations according to claim 1, the mass ratio that it is characterized in that bentazone, clopyralid and atrazine in this Herbicidal combinations is 1～40:1～50:1 ~ 40.

3. the Herbicidal combinations described in according to claim 1 and 2 is characterized in that bentazone, clopyralid and the atrazine three quality percentage composition in Herbicidal combinations is 1 ~ 85%.

4. the Herbicidal combinations described in according to claim 3 is characterized in that bentazone, clopyralid and the atrazine three quality percentage composition in Herbicidal combinations is 20 ~ 75%.

5. the Herbicidal combinations described in according to claim 1 is characterized in that it take bentazone, clopyralid and atrazine as active ingredient and the auxiliary agent that allows on the agricultural chemicals is mixed with any one formulation.

6. the Herbicidal combinations described in according to claim 5 is characterized in that described formulation is suspending agent, missible oil, water dispersion granule, wetting powder or aqueous emulsion.

7. Herbicidal combinations claimed in claim 1 is for the preparation of the application in the weed killer herbicide of corn field postemergence weed control.

8. Herbicidal combinations claimed in claim 1 is for the preparation of the application in the weed killer herbicide of preventing and kill off grass family and broad leaved weed in the corn field.