CN113229282A - Application of paclobutrazol as pesticide synergist - Google Patents

Application of paclobutrazol as pesticide synergist Download PDF

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CN113229282A
CN113229282A CN202110634800.9A CN202110634800A CN113229282A CN 113229282 A CN113229282 A CN 113229282A CN 202110634800 A CN202110634800 A CN 202110634800A CN 113229282 A CN113229282 A CN 113229282A
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paclobutrazol
pesticide
pymetrozine
nitenpyram
effect
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魏琪
傅强
朱旭晖
何佳春
万品俊
王渭霞
赖凤香
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China National Rice Research Institute
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China National Rice Research Institute
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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
    • A01N43/64—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms
    • A01N43/647—Triazoles; Hydrogenated triazoles
    • A01N43/653—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
    • 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
    • A01N43/34—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
    • A01N43/40—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings
    • 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
    • A01N43/64—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms
    • A01N43/707—1,2,3- or 1,2,4-triazines; Hydrogenated 1,2,3- or 1,2,4-triazines
    • 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
    • A01N51/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds having the sequences of atoms O—N—S, X—O—S, N—N—S, O—N—N or O-halogen, regardless of the number of bonds each atom has and with no atom of these sequences forming part of a heterocyclic ring

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

Abstract

The invention discloses application of paclobutrazol as a pesticide synergist, belonging to the technical field of agricultural production. The paclobutrazol is mixed with the chemical pesticide for use, can regulate and control the growth of plants, obviously improve the toxicity of the pesticide, prolong the pesticide effect duration time, improve the control effect of the pesticide, and has important value in the aspects of delaying the development of pesticide resistance and prolonging the life of pesticide varieties; in addition, the paclobutrazol is suitable for being mixed with various insecticides.

Description

Application of paclobutrazol as pesticide synergist
Technical Field
The invention relates to the technical field of agricultural production, in particular to application of paclobutrazol as a pesticide synergist.
Background
In agricultural production, the use of pesticides is one of the main measures for controlling crop pests. However, the long-term use of a single pesticide causes the drug resistance of pests to the pesticide, seriously influences the control effect of the pesticide and enlarges the loss of agricultural production. In order to maintain the control level, the amount of the pesticide used is increased or the number of times the pesticide is used is increased, which in turn increases the cost of agricultural production. The agricultural production requires that the development of the insect resistance is prevented or delayed by taking measures of scientifically and reasonably using pesticides, such as alternately using medicaments with different action mechanisms, scientifically mixing medicaments and the like, so that the field dosage and the use frequency of the pesticides are reduced. Meanwhile, the method is an effective means by enhancing the insect resistance of the plant or reducing the pesticide degradation capability of the plant, and the use of the plant growth regulator can delay the development of drug resistance and improve the control effect of the pesticide on drug-resistant pests.
The plant growth regulator is an artificially synthesized (or natural extracted from microorganisms) organic compound with growth and development regulating effects similar to natural plant hormones, the action mechanism of the plant growth regulator is to regulate the physiological activities of plants, and the plant growth regulator changes the insect-resistant capability of the plants and delays the metabolic rate of a medicament in the plants by regulating the morphological development of the plants, changing the enzyme activity of an antioxidant system of the plants and regulating the synthesis of insect-resistant substances, so that the control effect is improved. The plant growth regulator has no physiological toxicity to pests, but can achieve the purposes of prolonging the effective period of pesticide effect, improving the biological activity of the plant growth regulator, reducing the using amount, reducing the production cost and increasing the yield after being mixed with the pesticide.
Currently, plant growth regulators are mainly of the following type: crop growth promoters (auxin analogs, gibberellins, cytokinins, brassinosteroids, etc.), plant growth retardants (paclobutrazol, uniconazole, etc.), and plant growth inhibitors (abscisic acid, cynarin, etc.).
The invention reports a plant growth regulator for chemical pesticide synergism, namely paclobutrazol, which has synergism on various insecticides and has the chemical name: ((2RS,3RS) -1- (4-chlorophenyl) -4, 4-dimethyl-2- (1H-1, 2, 4-triazol-1-yl) pentan-3-ol, England name: Pacloutrazol, chemical structure as follows:
Figure BDA0003105140470000021
the applicant finds that after the paclobutrazol is respectively mixed with the nitenpyram, the dinotefuran, the triflumopyrimidine, the pymetrozine and the chlorantraniliprole according to a certain proportion, the compound has a good synergistic effect on drug-resistant insects, and the insecticidal rate is obviously improved. The mechanism of the synergistic effect of paclobutrazol on drug-resistant insects is not clear at present, and the paclobutrazol can inhibit the activity of the rice antioxidant system enzyme, delay the metabolic speed of the medicament in rice plants, increase the thickness of rice stem sheaths and increase the feeding difficulty of pests.
Disclosure of Invention
In view of this, the present invention aims to: the application of paclobutrazol as a pesticide synergist is provided; the main contents are as follows: the paclobutrazol is found to have a synergistic effect on nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole, can improve the toxicity of the pesticide when being mixed with the pesticide, and can be used by being mixed with the nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole; the key point is that: a plant growth regulator is found to have synergistic effect on pesticides, provides a new application of paclobutrazol, and is used for pest control in the field of pest control.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention claims the application of paclobutrazol as a pesticide synergist.
The invention has the advantages that the paclobutrazol is mixed with the chemical pesticide for use, the plant growth can be regulated and controlled, the toxicity of the pesticide is obviously improved, the pesticide effect duration is prolonged, the control effect of the pesticide is improved, and the paclobutrazol has important value in the aspects of delaying the development of pesticide resistance and prolonging the life of pesticide varieties; in addition, the paclobutrazol is suitable for being mixed with various insecticides.
Further, the pesticide is nitenpyram, dinotefuran, trifluoropyrimidine, pymetrozine or chlorantraniliprole.
Further, the synergistic weight ratio of the paclobutrazol to the nitenpyram is (1:10) - (3: 1).
The method has the beneficial effects that Nitenpyram (Nitenpyram) is an organic compound with the molecular formula of C11H15ClN4O2Molecular weight 270.715, relative density 1.255, melting/freezing point 82 ℃, chemical structure:
Figure BDA0003105140470000031
has excellent systemic property, osmosis, broad insecticidal spectrum, safety and no phytotoxicity, and can be widely applied to control various pests such as aphids, thrips, whiteflies, leafhoppers and the like on cucumbers, eggplants, radishes, tomatoes, grapes, tea and rice.
Further, the synergistic weight ratio of the paclobutrazol to the dinotefuran is (1:10) - (3: 2).
The method has the beneficial effects that Dinotefuran is an organic substance with the molecular formula of C7H14N4O3Molecular weight is 202.211, melting point is 107 ℃, and chemical structure is:
Figure BDA0003105140470000032
has a wide insecticidal spectrum and is very safe to crops, people, livestock and environment.
Further, the synergistic weight ratio of the paclobutrazol to the trifluoro-benzene pyrimidine is (1:2) - (10: 1).
The beneficial effect of adopting the further technical scheme is that the trifluoro-benzene pyrimidine(triflumzopyrim) is an organic substance with molecular formula C20H13F3N4O2Molecular weight is 398.338, chemical structure is:
Figure BDA0003105140470000041
is mainly used for preventing and controlling rice planthoppers of rice crops.
Further, the synergistic weight ratio of the paclobutrazol to the pymetrozine is (3:20) - (2: 1).
The method has the beneficial effect that the molecular formula of Pymetrozine is C10H11N5O, molecular weight 217.227, colorless crystal, chemical structure:
Figure BDA0003105140470000042
the pesticide belongs to pyridine (pyridinimide) or triazone pesticides, is a non-biocidal pesticide, was originally developed by Ciba Jiaji of Switzerland in 1988, and shows excellent control effect on sucking mouthparts pests of various crops. Pymetrozine has contact poisoning effect on pests and systemic activity. Can be transported in the xylem and phloem of the plant body; therefore, the fertilizer can be used for foliar spraying and soil treatment. Due to the good transmission and conduction characteristics, branches and leaves newly grown after stem and leaf spraying can be effectively protected.
Further, the synergistic weight ratio of the paclobutrazol to the chlorantraniliprole is (5:6) - (5: 1).
The technical scheme has the beneficial effect that the molecular formula of Chlorantraniliprole (Chlorantraniliprole) is C18H14BrCl2N5O2The molecular weight is 483.15, the pure product is white crystal in appearance, and the chemical structure is as follows:
Figure BDA0003105140470000051
high effect and broad spectrum, and can be used for treating lepidoptera such as noctuidae, snout moth's larva, moth-eating family, leaf roller moth, pink moth family, and plutella xylostellaThe compound pesticide has good control effects on the ophthalonidae, the plutella xylostella and the like, and can also control the Coleoptera weevilidae and the phyllocnidae; diptera order Amanita; bemisia tabaci and other non-lepidopteran pests. The excellent high-efficiency broad-spectrum insecticide for lepidoptera, main beetles and whiteflies has reliable and stable control effect under low dosage, immediately stops feeding, has longer pesticide effect period, is resistant to rain water flushing, and provides immediate and long-term protection at any period of crop growth. The action mechanism of the pesticide is different from that of other pesticides, and the pesticide can be combined with a ryanodine receptor in an insect body to inhibit the insect from feeding, so that the insect body is contracted, and finally, the insect is killed.
Furthermore, the formulation of the pesticide synergist is any one of water dispersible granules, wettable powder, suspending agents, oil suspension agents, missible oil, emulsion in water, soluble liquid and seed coating agents.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the paclobutrazol has a synergistic effect on nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole, can improve the toxicity of nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole when being mixed with the nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole, improves the control effect of the nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole on drug-resistant insects, and prolongs the duration of the drug effects of the nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole.
2. The invention provides a new application of the chemical agent, can be applied to the field of pest control, and simultaneously provides a new idea for innovation of pesticide compound combination.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
1. Reagent for testing
15.0% paclobutrazol wettable powder (Sichuan Runle technologies, Inc., national light brand); 30% nitenpyram water dispersible granule (Shaanxi-Rongkawei biology, Inc.); 20% dinotefuran suspension (Hongtian Biochemical, Inc., Guangxi Guilin, Inc.); 10% trifluoropyrimidine suspension (DuPont, USA); 50% pymetrozine amine water dispersible granule (Jiangsu Anbang electrochemical Co., Ltd.)
2. Source of test insects
Brown planthopper populations collected from the sunny areas of Hangzhou Zhejiang in 2012 are artificially raised indoors by TN1 rice plants at a temperature of 27 +/-1 ℃, a relative humidity of 80 +/-10% and a photoperiod of 16L: under 8D conditions.
3. Measurement method
Respectively preparing water solutions of nitenpyram, dinotefuran, triflumopyrimidine and pymetrozine with distilled water according to the recommended dosage in the field (30 kg of water per mu of land), and respectively preparing mixed solutions of paclobutrazol with different concentrations, nitenpyram (the weight ratio is 3:1), dinotefuran (the weight ratio is 1:10), triflumopyrimidine (the weight ratio is 1:2) and pymetrozine (the weight ratio is 3:20) with distilled water into the mixed solutions with the same pesticide concentration.
Selecting potted rice seedlings with the same growth vigor and without leaf cutting, respectively inverting and immersing for 30s, and then putting the seedlings into a transfer box (the rice seedlings are firstly washed by clear water before being immersed, and the tillering number is trimmed to 7, so that gaps are left between tillers as much as possible, and the seedlings are used after no water drops exist on the surfaces); the seedlings of the transfer box are placed in a laboratory for 1h, the leaves between the seedlings do not contact when the seedlings are placed, and the seedlings are transferred to a phytotron after the surfaces of the leaves are free of liquid. Dividing rice seedlings into 4 groups at random, respectively selecting three-instar brown planthopper nymphs with consistent growth vigor to be inoculated to each treated rice seedling 14 days, 21 days, 28 days and 35 days after treatment, and inoculating 15 planthoppers each time; the number of nymphs dead of the brown planthoppers treated each was recorded after 4 days.
4. Data processing
The significance of the differences between treatments was calculated using SPSS 26.0 software with a confidence interval of 95%.
Synergistic multiple is the kill rate of the brown planthopper nymphs after compound treatment/the kill rate of the drug control nymphs.
5. Results of the experiment
As shown in tables 1-5.
TABLE 1 synergistic effect of paclobutrazol on nitenpyram (weight ratio 3:1)
Figure BDA0003105140470000071
As can be seen from Table 1, the toxicity of nitenpyram to brown planthopper can be obviously improved by compounding the paclobutrazol and the nitenpyram, and the pesticide effect of the nitenpyram is prolonged, wherein the pesticide effect is increased by 1.7 times after 14 days, 8.7 times after 21 days, 17 times after 28 days and 14.9 times after 35 days.
TABLE 2 synergistic Effect of paclobutrazol on dinotefuran (weight ratio 1:10)
Figure BDA0003105140470000072
Figure BDA0003105140470000081
As can be seen from Table 2, the compounding of paclobutrazol and dinotefuran can obviously prolong the drug effect of dinotefuran, the synergy is not significant 14 days after the drug is applied, the synergy is 1.1 times after 21 days, the synergy is 1.3 times after 28 days, and the synergy is 1.8 times after 35 days.
TABLE 3 synergistic Effect of paclobutrazol p-trifluorophenylpyrimidine (weight ratio 1:2)
Figure BDA0003105140470000082
As can be seen from table 3, the compounding of paclobutrazol and trifluoropyrimidine can significantly prolong the drug effect of trifluoropyrimidine, the synergistic effect is not significant 14 days after the drug is applied, 1.8 times the synergistic effect is achieved 21 days after the drug is applied, 2.5 times the synergistic effect is achieved 28 days after the drug is applied, and 1.7 times the synergistic effect is achieved 35 days after the drug is applied.
TABLE 4 synergistic Effect of paclobutrazol on pymetrozine (weight ratio 3:20)
Figure BDA0003105140470000083
As can be seen from Table 4, the combination of paclobutrazol and pymetrozine can obviously improve the toxicity of pymetrozine to Nilaparvata lugens and prolong the pesticide effect of pymetrozine, the synergy is not obvious after 14 days and 21 days, the synergy is 1.1 times after 28 days and 1.2 times after 35 days.
TABLE 5 indoor virulence of paclobutrazol at different concentrations against the triple-instar brown planthopper nymphs
Figure BDA0003105140470000091
As can be seen from table 5, paclobutrazol did not have a lethal effect on the triple-instar brown planthopper nymphs within the tested concentration range.
Example 2
1. Reagent for testing
Weighing 2.63g of paclobutrazol crude drug (Beijing Soilebao science and technology Co., Ltd.), dissolving the paclobutrazol crude drug with acetone, fixing the volume to 100mL, and preparing 25000ppm mother liquor for later use; 200g/L chlorantraniliprole suspension concentrate (product name "Kangkuan" of the American Fumei company).
2. Method for testing and investigating field pesticide effect
Test site: paddy field in rich yang region of Hangzhou city of Zhejiang province; rice variety: zhongjiazao 17, leaf surface spray tests were performed at 28 days 3 and 23 days 4 in 2021, and a total of treatments were set: 50mg/L paclobutrazol; ② 150mg/L paclobutrazol; ③ 300mg/L paclobutrazol; fourthly, 50mg/L of paclobutrazol and 60mg/L of KANGFWI; fifthly, 150mg/L paclobutrazol +60mg/L KANGFWI; sixthly, 300mg/L paclobutrazol and 60mg/L KANGWAN; seventhly, 60mg/L of health width. 50m per cell2(ii) a And (8) blank processing (no medicine application). And (3) repeating each treatment for three times, performing chilo suppressalis control effect investigation 2 weeks and 5 weeks after pesticide application, respectively, investigating 5 points per plot and 10 clusters per plot of rice in the field by adopting a diagonal 5-point sampling method, investigating the number of withered sheaths and withered hearts, and calculating the withered sheaths rate, the withered hearts rate and the control effect.
3. Calculation of control effect
Chilo suppressalis withered sheath (heart) rate (%) [ number of withered sheath (heart) plants/total number of investigated plants ] x 100;
the correction control effect is (1-the damage rate of the medicament treatment area/the damage rate of the blank control area) × 100
4. Data processing
The DPS data processing system is used for carrying out one-factor variance analysis on the test data, and the Duncan's new complex polarization method is used for carrying out difference analysis among different processing groups
5. Results of the experiment
TABLE 6 synergistic effect of compound pairing of paclobutrazol and chlorantraniliprole with different concentrations for preventing and controlling chilo suppressalis
Figure BDA0003105140470000101
As can be seen from Table 6, the compounding of 50mg/L, 150mg/L, 300mg/L paclobutrazol and KANGBAO (chlorantraniliprole) can obviously improve the control effect of a single pesticide on the damage of chilo suppressalis (the control effect of the scabby scabbard is improved by 53.2 percent on average, and the control effect of the scabby is improved by 13.8 percent on average), and the control effect cannot be achieved when 50mg/L, 150mg/L and 300mg/L paclobutrazol is applied alone.
The tests show that paclobutrazol has a synergistic effect on nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole, can improve the toxicity of nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole when being mixed with nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole, improves the control effect of nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole on drug-resistant insects, and prolongs the duration of the pesticide effects of nitenpyram, dinotefuran, triflumopyrimidine, pymetrozine and chlorantraniliprole.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. Application of paclobutrazol as pesticide synergist.
2. Use of paclobutrazol as a synergist for insecticide according to claim 1, wherein the insecticide is nitenpyram, dinotefuran, trifluoropyrimidine, pymetrozine or chlorantraniliprole.
3. Use of paclobutrazol as a pesticide synergist according to claim 2, wherein the paclobutrazol and nitenpyram have a synergistic weight ratio of (1:10) - (3: 1).
4. Use of paclobutrazol as a pesticide synergist according to claim 2 wherein the paclobutrazol and dinotefuran are in a synergistic weight ratio of (1:10) to (3: 2).
5. Use of paclobutrazol as a pesticide synergist according to claim 2 wherein the paclobutrazol and trifluorfluoropyrimidine are in a synergistic weight ratio of (1:2) to (10: 1).
6. Use of paclobutrazol as a synergist for insecticides according to claim 2, wherein the paclobutrazol and pymetrozine are in a synergistic weight ratio of (3:20) - (2: 1).
7. Use of paclobutrazol as a pesticide synergist according to claim 2 wherein the paclobutrazol and chlorantraniliprole are in a synergistic weight ratio of (5:6) - (5: 1).
8. The use of paclobutrazol as a pesticide synergist in any one of claims 1 to 7, wherein the pesticide synergist is in the form of any one of water dispersible granules, wettable powder, suspending agent, oil suspension, emulsifiable concentrate, aqueous emulsion, soluble liquid and seed coating agent.
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