CN116918810A - Pesticide composition and application thereof - Google Patents

Abstract

The invention relates to the technical field of pesticides, and specifically discloses a pesticide composition and its application. The insecticide composition includes active component A and active component B; the active component A includes 4-trifluoromethylnicotinamide, and the active component B includes pymetrozine and spirotetramat. of at least one. The invention provides a pesticide composition with excellent control effect on sucking pests, especially excellent local control effect on homoptera pests, with small dosage and few application times, and can effectively reduce the environmental and non-toxic effects of the drug on the environment. Target organisms and the impact of target organism resistance.

Description

A kind of insecticide composition and its application

This invention is a divisional application with an application date of June 22, 2022, an application number of 202210715551.0, and an invention name of "A Pesticide Composition and its Application". The applicant is Hebei Ailin Chemical Technology Co., Ltd.

Technical field

The present invention relates to the technical field of pesticides, and in particular to a pesticide composition and its application.

Background technique

Sucking pests are a larger group of pests. They are small in size, and their damage is often not obvious in the early stages of occurrence, making them easily overlooked by people. However, they are extremely numerous and often live in groups on twigs, leaves, buds, flower buds, and fruits, absorbing plant juices and plundering their nutrients, causing branches, leaves, and flowers to curl. , or even the entire plant withers or dies. At the same time, sucking pests can easily induce sooty stains, and the pests themselves are also vectors for a variety of plant viral diseases.

Currently, most of the pesticides commonly used for sucking pest control are nicotine, pymetrozine, pyrethroids, etc. However, as the frequency of use of nicotine and pyrethroid pesticides increases, the resistance to them increases significantly. Now, During use, the control effect often has poor stability and short duration, and it is difficult to achieve the expected control effect even after repeated use. The large and repeated use of these pesticides will inevitably have an impact on the environment, non-target organisms, and pest resistance. A large amount of drug residues also affects the healthy consumption of crops to a certain extent.

Therefore, it has become an inevitable trend to research new pesticides that have good environmental compatibility, low dosage, low residue, good control effect, and can effectively prevent the spread of sucking pests.

Contents of the invention

In view of the above-mentioned problems existing in existing pesticides for preventing and controlling diseases and insect pests, the present invention provides a pesticide composition and its application. The pesticide composition has excellent control effect on sucking pests and has a small dosage. , low application frequency.

In order to achieve the above-mentioned object of the invention, the embodiments of the present invention adopt the following technical solutions:

A pesticide composition including active component A and active component B;

The active component A includes 4-trifluoromethyl-3-pyridinecarboxamide (TFNA-AM), and the active component B includes at least one of pymetrozine and spirotetramat.

Compared with the prior art, the insecticide composition provided by the present invention has a control effect on homoptera pests through the combination of the above-mentioned 4-trifluoromethylnicotinamide (TFNA-AM) and pymetrozine or spirotetramat. It has significant synergistic effect and reduces the dosage of pesticides. At the same time, the combination of TFNA-AM and pymetrozine or spirotetramat can greatly improve the long-lasting effect of insecticides, significantly reduce the number of applications, and effectively avoid sooty stains and various plant virus diseases induced by sucking pests. spread. The pesticide provided by the invention effectively reduces the impact of pesticide preparations on the environment, non-target organisms and the resistance of control objects during use, and has environmentally friendly characteristics.

Preferably, the mass ratio of the active component A and the active component B is 1:0.1-10.

Preferably, the mass ratio of the active component A and the active component B is 1:0.2-5.

The composition ratio of the above-mentioned active component A and the active component B can further improve the control effect of the pesticide and reduce the dosage of the pesticide.

The invention also provides a pesticide preparation, including the pesticide composition and auxiliaries.

The present invention also provides the use of the pesticide composition in preparing pesticide formulations for preventing and controlling sucking pests.

Preferably, the sucking pests are homoptera pests.

The present invention also provides a method of using the pesticide composition. The method of use is as follows: after mixing the pesticide composition and water according to a mass ratio of 1:2000-5000, spray the pesticide composition on crops.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with examples. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention.

Example 1

Toxicity test of composition against cotton aphid:

The specific verification method is:

The Sun Yunpei method was used to evaluate the effectiveness of pesticides, determine the toxicity LC ₅₀ or LD ₅₀ value of pesticides, and calculate the relative toxicity index and co-toxicity coefficient. If the co-toxicity coefficient is greater than 120, it is a synergistic effect; if the co-toxicity coefficient is between 80-120, it is a superimposed effect; if the co-toxicity coefficient is less than 80, it is an antagonism.

Toxicity index (T1) = (standard pesticide LC ₅₀ /single dose LC ₅₀ ) × 100;

The measured toxicity index of the mixture (AT1) = (standard insecticide LC ₅₀ /mixture LC ₅₀ ) × 100;

Theoretical toxicity index of mixture (TT1) = toxicity index of agent A × content of agent A in the mixture (%)

+Agent B toxicity index×Agent B content in the mixture (%);

Mixture co-toxicity coefficient (CTC) = (mixture measured toxicity index/mixture theoretical toxicity index) × 100.

Standard insecticide: a compound with a designated toxicity index of 100; single dose: 4-trifluoromethylnicotinamide (TFNA-AM), pymetrozine or spirotetramat; mixture: TFNA-AM and pymetrozine or a combination of spirotetramat.

The test pests are sensitive aphid nymphs raised on cotton seedling plants in the laboratory. The pests should be of the same age and have no significant individual differences.

Weigh a certain amount of the original compound, dissolve it in methanol, and prepare a high-concentration mother solution. Dilute with distilled water containing 0.1% TritonX-100 to form a mass concentration gradient of 5 to 7.

The leaf immersion method is used for measurement. Healthy and flat true leaves are selected, completely immersed in the medicinal solution of each concentration for 15 seconds and then the excess medicinal solution is drained off. The leaves are dried and placed in a petri dish covered with an agar base. Each dish is connected to About 30 cotton aphid test insects were then moved to normal conditions and reared, and the mortality rate of the test insects was checked after 72 hours. The results are shown in Table 1.

Table 1 Indoor toxicity test results of compositions to cotton aphid

According to the results of indoor aphids testing on cotton aphids, the combination of TFNA-AM and pymetrozine or spirotetramat in different proportions can show significant synergistic effects. Among them, when the ratio of component A to component B is 2:3, it shows the largest co-toxicity coefficient.

Example 2

Toxicity test of the composition to brown planthopper:

The rice seedling dipping method was used to measure. Select cup-planted rice seedlings with a plant height of about 10cm. Add 2 mL of 1.5% water agar solution to the soil surface of the rice seedlings and let it stand for 1 hour before solidifying. Place the cup-grown rice seedlings upside down in the prepared solution, soak them to the base of the rice seedlings for 30 seconds, and then take them out to dry. Use an insect sucker to pick out 10 to 15 rice brown planthopper nymphs, attach them to the treated rice seedlings, and move them to normal conditions for rearing. Observe the results after 10 to 15 days of treatment. The results are shown in Table 2.

Table 2 Indoor toxicity test results of compositions to brown planthoppers

As shown in the results in Table 2, the combination of TFNA-AM and pymetrozine or spirotetramat in different proportions can show obvious synergistic effects on rice brown planthopper. Among them, when the ratio of component A to component B is 2:3, it shows the largest co-toxicity coefficient.

Example 3

Toxicity test of compositions against whitefly:

Use leaf dipping method. Select a number of healthy, insect-free cucumber leaves, immerse them in different concentrations of medicinal solutions for 30 seconds, then take them out and dry them. Place a layer of filter paper in the Petri dish, then place the leaves on the Petri dish filter paper, wrap the petioles with wet absorbent cotton to moisturize, and insert 40 to 50 1st to 2nd instar nymphs of whitefly into each dish. After processing 3d, investigate the results. The results are shown in Table 3.

Table 3 Indoor toxicity test results of compositions to whitefly

According to the indoor test results of whitefly whiteflies, the combination of TFNA-AM and pymetrozine or spirotetramat in different proportions can show significant synergistic effects. Among them, when the ratio of component A to component B is 2:3, it shows the largest co-toxicity coefficient.

Based on the above laboratory toxicity test results, it was found that the ratio of TFNA-AM to pymetrozine or spirotetramat is 2:3, which has the most significant synergistic effect. Therefore, this ratio is used to prepare preparations for subsequent field medicines. effectiveness test.

Example 4

Field control efficacy test, efficacy calculation method:

Insect population reduction rate = (number of insects before application - number of insects after application) / number of insects before application × 100%

Control effect = (treatment insect population reduction rate - control insect population reduction rate) / (1 - control insect population reduction rate) × 100%.

Each compound preparation: 5% TFNA-AM suspension, 22.4% spirotetramat suspension, 25% pymetrozine suspension, 16% TFNA-AM + 24% pymetrozine suspension (mixture 1), 16% TFNA-AM + 24% spirotetramat suspension (mixture 2).

Field test of insecticidal composition against cotton aphid:

The experiment was conducted in Alar City, Xinjiang, and cotton plants with 7-8 leaf years and consistent growth were selected for spray treatment. Dilute each preparation according to the dilution factor listed in the table, and use the preparation package without active ingredients as a control. Each treatment had 4 replicates, and each replicate contained at least 100 cotton aphids. The population base was investigated before pesticide application, and the remaining number of cotton aphids was investigated 3 days, 7 days, 14 days, and 24 days after pesticide application, and the population reduction rate and control effect were calculated. The test results are shown in Table 4.

Table 4 Results of field control effectiveness of insecticides against cotton aphids

The test results show that the pesticides obtained by compounding TFNA-AM with pymetrozine or spirotetramat have good control effects on cotton aphids. It already has a good control effect 3 days after treatment, and the control effect is excellent 7 days after treatment. Compared with a single dose, the combination of TFNA-AM and pymetrozine or spirotetramat has enhanced rapid effect and obvious sustained effect.

Example 5

Field control efficacy test of insecticidal compositions against whitefly:

The test was conducted in Shijiazhuang City, Hebei Province. The test crop was cucumber, and plants with consistent growth were selected for spray treatment. Each preparation was diluted according to the dilution factor listed in the table, and a treatment package containing no active ingredients was used as a control. Four plots were set up for each treatment. The population base was investigated before pesticide application. The remaining number of whiteflies was investigated 3 days, 7 days, 14 days, and 21 days after pesticide application, and the population reduction rate and control effect were calculated. The test results are shown in Table 5.

Table 5 Results of field control effectiveness of insecticides against whitefly

The test results show that the pesticides obtained by compounding TFNA-AM with pymetrozine or spirotetramat have good control effects on whiteflies. A good preventive effect has been achieved 3 days after taking the drug, and the preventive effect can reach more than 95% 7 days after taking the drug. It still has good control effect 21 days after treatment.

Example 6

Field control efficacy test of insecticidal compositions against brown planthopper:

The test was conducted in Huaian, Jiangsu. The test crop was rice. Plants with consistent growth were selected for spray treatment. Each preparation was diluted according to the dilution multiple listed in the table. The treatment with a preparation package containing no active ingredients was used as a control. Three plots were set up for each treatment, and each plot contained 30 plants. The population base was investigated before pesticide application, and the remaining number of brown planthoppers was investigated 3d, 7d, 14d, and 30d after pesticide application, and the population reduction rate and control effect were calculated. The test results are shown in Table 6.

Table 6 Results of field control effectiveness of insecticides against brown planthopper

The test results show that the pesticides obtained by compounding TFNA-AM with pymetrozine or spirotetramat have good control effects on rice planthoppers. A good preventive effect has been achieved 3 days after a single dose, and the preventive effect is greater than 95% 7 days after the dose.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (6)

1. A pesticide composition, characterized by: comprising active component A and active component B; The active component A includes 4-trifluoromethylnicotinamide, and the active component B includes spirotetramat; the mass ratio of the active component A and the active component B is 1:0.1-10 . 2. The pesticide composition according to claim 1, characterized in that: the mass ratio of the active component A and the active component B is 1:0.2-5. 3. A pesticide preparation, characterized in that it includes the pesticide composition according to any one of claims 1-2 and auxiliaries. 4. Application of the insecticide composition according to any one of claims 1 to 2 in the preparation of pesticide formulations for preventing and controlling sucking pests. 5. Application of the insecticide composition according to claim 4 in preparing pesticide formulations for preventing and controlling sucking pests, characterized in that: the sucking pests are homoptera pests. 6. The use method of the pesticide composition according to any one of claims 1-2, characterized in that: after mixing the pesticide composition and water according to the mass ratio of 1:2000-5000, the crops Carry out spraying.