FIELD OF INVENTION
The present invention relates to a novel synergistic water dispersible granular composition comprising buprofezin, fenobucarb, and acephate,and a process for the preparation of the same.
BACKGROUND OF THE INVENTION
It has been observed that plants or pests tend to develop resistance to stand alone compositions of agrochemically active substances on their repeated use. Hence, there is always a need to develop agrochemical compositions comprising combinations of active substances having different modes and sites of action so as to reduce or delay the development of resistance in plants or pests. In addition such carefully selected multi-component products often exhibit synergistic effect leading to reduction of overall use of the actives and significantly prevent injudicious and often unscientific tank mixing of individual pesticidal products by the user. The user will be immensely benefitted if such a combination product is made available to him as water dispersible granules (WDG) which are distinguished by several user and environment friendly characteristics such as ease of use, storage and packing, freedom from dust and minimum use of toxic, volatile, inflammable, non-biodegradable solvents, when compared to the solid formulations like wettable powders (WP) and liquid products like emulsifiable concentrates (EC), soluble liquids (SL), emulsions, oil in water (EW) and suspension concentrates (SC).
WDG formulations comprising solid active substances having relatively high melting point (m. p.> 70°C) are well known. They can be prepared by several techniques such as extrusion, spray granulation and pan granulation. However, difficulties have been observed in developing free flowing, dustless WDG formulations comprising liquid or low-melting solid active substances (m. p. < 70°C), due to the physical nature of these actives. These difficulties obviously get compounded when we try to combine a liquid/ low melting active with a solid active substance in order to prepare a WDG formulation with good dispersion consisting of both solid actives and liquid actives in the biologically desired concentration. While the standard processes of preparing WDG compositions have been known, these processes are not generally feasible when preparing a combination of at least one solid active ingredient and a liquid or low melting active substance. The compositions developed by these processes do not possess good dispersion, stability, shelf life and other properties a WDG should have. However, identifying appropriate insecticidal application rates and combinations is essential to achieve synergistic insect control. Thus, there is a need for a synergistic insecticidal combination which demonstrates a high controlling effect along with reduced crop protection cost and reduced environmental load. Buprofezin (IUPAC name: (Z)-2-tert-butylimino-3-isopropyl-5-phenyl-1,3,5-thiadiazinan-4-one) as described in The Pesticide Manual, 15th Edition, BCPC at Entry No. 106 has structural formula as given below:

Buprofezin has a particular mechanism of action: it acts as a molting inhibitor, and thus appears particularly suitable for the control of scale insects, whitefly and leafhoppers. Buprofezin is a persistent insecticide with contact and stomach action; not translocated in plants. It inhibits molting of nymphs and larvae, leading to death. It also suppresses oviposition by adults; and treated insects lay sterile eggs.
Buprofezin, however, has a number of disadvantages. One of these, for example, is that the active compound is slightly phytotoxic to some crops. Furthermore, buprofezin is only effective at the actual time when the insect (Homoptera, some Coleoptera and Acarina) to be treated is molting (since it is a molting inhibitor). Therefore, it is largely without effect against imagines, which are thus still capable of ovi-position, so that when the covering of active compound on the surface of the plant has disappeared the insect is able to repopulate.
Fenobucarb (BPMC) (IUPAC name: 2-sec-butylphenyl methylcarbamate) is described in “Agrochemicals Handbook 1992 Edition” published on July 30, 1992 by Japan Plant Protection Association and “SHIBUYA INDEX -1996-(7th Edition)” published on Apr. 1, 1996 by ZENNOH. Fenobucarb was first reported in 1962 by R. L. Metcalf in Journal of Economic Entomology, 1962, 55, 889 having the following structural formula.

Fenobucarb is a non-systemic insecticide which acts as a cholinesterase inhibitor and is mainly used for the control of leafhopper, plant hoppers, thrips and weevil in paddy, sugarcane, wheat, cucurbits etc.
Acephate (IUPAC name: O,S-dimethyl acetylphosphoramidothioate) belongs to organophosphate group of insecticides with structural formula

Acephate is a systemic insecticide for control of wide range of chewing and sucking insects namely, aphids, jassids, thrips, leaf hoppers, cut worms etc. Acephate is non phytotoxic and of moderate persistence with low residual activity.
Combinations offer significant advantages over individual applications including improved and extended insect control, reduced insecticide application rates and costs, shorter contact times for improved results, less stringent use restrictions, improved selectivity, improved spectrum of insects controlled, reduced cost and reduced residue problems. However, identifying appropriate insecticide application rates and ratio of the combinations is essential to achieve efficacious insect control. Composition of Buprofezin and fenobucarb are known and reported in certain prior arts and are available in market in different ratios but their indiscriminate use gives rise to resistance among different pests. Y. S. Basanth et al., Rice Science, 2013, 20(5): 371-378, reported the decreasing susceptibility of buprofezin and fenobucarb alone and in combination on different populations of BPH (Nilaparvatalugens), in major rice growing areas of Karnataka. Hence, there is still a need for new compositions which are broad spectrum, having higherinsecticidal activity and less toxicity. Accordingly, there is a need for novel, stable and safecompositions comprising buprofezin, fenobucarb and an additional insecticidal compound with synergistic effect.
SUMMARY OF THE INVENTION
In accordance with an embodiment of the invention, there is provided a synergistic insecticidal composition, comprising: (a) buprofezin; (b) fenobucarb; and (c) acephate.
In accordance with another embodiment of the invention, buprofezin is present in an amount in the range from 5-15 % w/w.
In accordance with another embodiment of the invention, fenobucarb is present in an amount in the range from 10-40% w/w.
In accordance with another embodiment of the invention, acephate is present in an amount in the range from 2-4% w/w.
In accordance with another embodiment of the invention, the synergistic insecticidal composition is formulated as a water dispersible granule (WDG) or emulsifiable concentrate (EC).
In accordance with another embodiment of the invention, the synergistic fungicidal composition optionally comprises (a) a wetting agent, (b) a dispersing agent, and (c) at least one filler; wherein the formulation is in the form of water dispersible granules (WDG).
In accordance with another embodiment of the invention, the synergistic insecticidal composition optionally comprises (a) an emulsifier, (b) at least one co-solvent, and (c) a solvent; wherein the formulation is in the form of an emulsifiable concentrate.
In accordance with another embodiment of the invention, the synergistic insecticidal composition effectively controls target insects, is non-phytotoxic and enhances the vigour/yield of the plant.
In accordance with another embodiment of the invention, there is provided a process for the preparation of the water dispersible granular (WDG) composition comprising the steps of: a) preparing a fine suspension of at least one solid agrochemically active substance and at least one agrochemically acceptable excipient in water; b) preparing a filler base of at least one sorptive filler and at least one agrochemically acceptable excipient; c) blending the suspension of step a) with the filler base of step b) to get a wet mass; d) extruding and drying the wet mass of step c) to get water dispersible granules of the at least one solid agro-chemically active substance; e) preparing an emulsifiable solution comprising at least one liquid or low melting agrochemically active substance; and, f) absorbing the emulsifiable solution of step e) in the granules of step d) to obtain the water dispersible granular composition.
In accordance with another embodiment of the invention, there is provided a process for the preparation of an emulsifiable concentrate (EC) composition comprising the steps of: a) admixing buprofezin, acephate, solvent, co-solvent in a mixing vessel to obtain a first clear homogenous liquid; (b) admixing fenobucarb, the first clear homogenous liquid, and an emulsifier to obtain a second clear homogenous liquid; and (c) filtering the second clear homogenous liquid to form an emulsifiable concentrate composition.
DETAILED DESCRIPTION OF THE INVENTION
The invention according to its various aspects is particularly pointed out and distinctly claimed in the appended claims read in view of this specification and appropriate equivalents.
It is to be noted, as used in the specification and the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a composition containing “a compound includes a mixture of two or more compounds. It should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise. The expression of various quantities in the terms of “% w/w” means the percentage by weight, relative to the weight of the total composition unless otherwise specified.
The term "agrochemically effective amount" is that quantity of active agent, applied in any amount which will provide the required control of pest and diseases. The particular amount is dependent upon many factors including, for example, the crop, pest and disease sought to be controlled and environmental conditions. The selection of the proper quantity of active agent to be applied, however, is within the expertise of one skilled in the art.
The present invention provides a novel, stable and synergistic insecticidal composition. The novel composition of the present invention comprises combination of at least one solid agrochemically active and a liquid or low melting agrochemically active along with other excipients.
Liquid or low melting agrochemical active used in the invention is Fenobucarb (BPMC) (IUPAC name: 2-sec-butylphenyl methylcarbamate). The liquid or low melting agrochemical active may be present in an amount ranging from 10 to 40% w/w based on the weight of the insecticidal combination.
The solid active ingredients are selected from group of acephate, acetamiprid, buprofezin, imidacloprid, and thiamethoxam. Preferably the solid actives are acephate ((IUPAC name: O,S-dimethyl acetylphosphoramidothioate) and buprofezin (IUPAC name (Z)-2-tert-butylimino-3-isopropyl-5-phenyl-1,3,5-thiadiazinan-4-one). The solid agrochemical actives may be present in an amount ranging from 5 to 20% w/w based on the weight of the insecticidal combination. Acephate is present in an amount in the range from 2-4% w/w and buprofezin is present in an amount in the range from 5-15% w/w.
The synergistic insecticidal composition is formulated as emulsifiable concentrate, pellets, tablets, dry flowable, wettable powder and water dispersible granules, has good storage stability, shows no phytotoxicity and also solves the problem of resistance in target pests.
The synergistic fungicidal composition, optionally comprises (a) a wetting agent, (b) a dispersing agent, and (c) at least one filler to form a water dispersible granular (WDG) composition, and optionally comprises (a) an emulsifier, (b) at least one co-solvent, and (c) a solvent to form the emulsifiable concentrate formulation.
The present invention is more particularly described in the following examples that are intended as illustrations only, since numerous modifications and variations within the scope of the present invention will be apparent to those of skill in the art. Unless otherwise noted, all parts, percentages, and ratios reported in the following examples are on a weight basis and all reagents used in the examples were obtained or are available from the chemical suppliers.

Examples 1-4:
Composition of synergistic insecticidal composition
The unit of each value below is “% w/w”, i.e., percentage weight by weight, relative to the weight of the composition unless otherwise specified. The composition tabulated in Table 1 is formulated as water dispersible granules (WDG) and the composition tabulated in Table 2 is formulated as an emulsifiable concentrate (EC).
Table 1: Examples of synergistic insecticidal compositions as water dispersible granules.
S. No. Component Function Example
1 2
1 Fenobucarb (BPMC) Technical Active Ingredient 22.50 22.50
2 Buprofezin Technical Active Ingredient 11.25 11.25
3 Acephate Technical Active Ingredient 2.50 3.75
4 Lignosulfonate Acid, Sodium Salt Wetting Agent 12.00 12.00
5 Alkyl Polyglycoside Dispersing Agent 2.00 2.00
6 Precipitated Silica Filler 5.00 5.00
7 China Clay Filler Q.S. Q.S.

Table 2: Examples of synergistic insecticidal compositions as emulsifiable concentrates.
S. No. Component Function Example
3 4
1 Fenobucarb (BPMC) Technical Active Ingredient 22.50 22.50
2 Buprofezin Technical Active Ingredient 11.25 11.25
3 Acephate Technical Active Ingredient 2.50 3.75
4 Blend of Calcium AlkylarylSulphonate and Polyoxy Ethylene ether Emulsifier 10.00 10.00
5 N-methyl pyrrolidone Co-solvent 12.00 12.00
6 Dimethyl sulfoxide Co-solvent 12.00 12.00
7 C-IX Solvent Q.S. Q.S.
Example 5
Process of preparing thenovel synergistic insecticidal composition:
The novel synergistic insecticidalcomposition(s) in Example 1-4 are prepared by the process described hereinafter. The process of manufacture 100 kg w/w batch size of insecticidalcomposition comprising at least one solid agrochemically active component and one liquid or low melting agochemically active.
Process 1: Process of preparing asynergistic insecticidal composition in the form of Water Dispersible Granules (WDG). (Ingredients are present in amounts stated in table 3)
A fine suspension of at least one solid agrochemically active substance (Buprofezin and Acephate) and Lignosulfonate Acid, Sodium Salt & Alkyl Polyglycoside was preparedin water.Thereafter a filler base of at least one sorptive filler (precipitated silica) and at least one agrochemically acceptable excipient (China clay) was prepared. The suspension and the filler base were mixed to get a wet mass.The wet mass was extruded and dried to afford granules of the at least one solid agro-chemically active substance (Buprofezin and Acephate).An emulsifiable solution comprising at least one liquid or low melting agrochemical active substance (Fenobucarb) was prepared and absorbed into the granules to obtain the water dispersible granules.
Table 3: Quantities of raw materials charged
S.
No. Component Function Quantities of raw material charged (Kg/100 kg batch)
Batch 1 Batch 2
1 Fenobucarb (BPMC) Technical (Purity: 95% w/w) Active Ingredient 23.69 23.69
2 Buprofezin Technical
(Purity: 98% w/w) Active Ingredient 11.50 11.50
3 Acephate Technical
(Purity: 97% w/w) Active Ingredient 2.60 3.87
4 Lignosulfonate Acid, Sodium Salt Wetting Agent 12.00 12.00
5 Alkyl Polyglycoside Dispersing Agent 2.00 2.00
6 Precipitated Silica Filler 5.00 5.00
7 China Clay Filler 43.21 41.94

Process 2: Process of preparing asynergistic insecticidal composition in the form of an Emulsifiable Concentrate (EC) (Ingredients are present in amounts stated in table 4)
The required amounts of Buprofezin and Acephate (Table 4) are transferred in a mixing vessel with required quantity of solvent, and co-solvent and mixed to obtain a clear homogeneous liquid. Now add suitable emulsifiers and Fenobucarb (BPMC) in this clear homogeneous liquid. After dissolution and homogenization of emulsifier, filter the homogeneous liquid. Subsequently, the sample was further tested for quality parameters for confirmation to the laid down specification and packed as per requirement after approval.
Table 4: Quantities of technical and raw materials charged
S.
No. Component Function Quantities of raw material charged (Kg/100 lit batch)
Batch 3 Batch 4
1 Fenobucarb (BPMC) Technical (Purity: 95% w/w) Active Ingredient 23.69 23.69
2 Buprofezin Technical
(Purity: 98% w/w) Active Ingredient 11.48 11.48
3 Acephate Technical
(Purity: 97% w/w) Active Ingredient 2.58 3.87
4 Blend of Calcium AlkylarylSulphonate and Polyoxy Ethylene ether Emulsifier 10.00 10.00
5 N-methyl pyrrolidone Co-solvent 12.00 12.00
6 Dimethyl sulfoxide Co-solvent 12.00 12.00
7 C-IX Solvent 28.25 26.96

Example 6
Evaluation of the effects of synergistic insecticidal compositions.
In the evaluation of the synergistic effect, a field trial was conducted on paddy to evaluate the insecticidal control of brown plant hopper (BPH); white backed plant hopper (WBPH) and Green leaf hopper (GLH) with fenobucarb, buprofezin and acephate alone and in a ternarymixture as a foliar application. The ternary mixture is prepared by the process described in the Example 5. Commercially available compositions of fenobucarb (BREAK 50% EC), buprofezin (DELIGENT 25% SC) and acephate (WILLACE 75% SP) were diluted with water to the stated concentration of the active compound. Applications were made with a backpack type sprayer fitted with a pressure regulator and a vertical bar with one hollow cone nozzle. Experiment were carried out in randomized blocks with four repetitions and each plot was measured an area of 100 sq. m. The rate of application was 200 l/acre for all the trials. The number of insects (nymph, adults) per hill was assessed 1, 3, 7 & 10 days after application (DAA).
Target pests: Brown Plant Hopper (BPH); White Backed Plant Hopper (WBPH) and Green Leaf Hopper (GLH).
Crop: Paddy
Water volume/acre: 200 liters/acre
The treatment details are tabulated in Table 5 below.

Table 5: Treatments for evaluation of bio-efficacy against sucking pests in paddy
Particulars Treatment Dose/Acre
T1 Fenobucarb 22.5 + Buprofezin 11.25 + Acephate 3.75% WDG 640 gm
T2 Fenobucarb 22.5% + Buprofezin 11.25% + Acephate 2.5% WDG 640 gm
T3 Fenobucarb 50% EC 600 ml
T4 Fenobucarb 22.5 + Buprofezin 11.25 + Acephate 3.75% EC 640 ml
T5 Buprofezin 25% SC 320 ml
T6 Fenobucarb 22.5% + Buprofezin 11.25% + Acephate 2.5% EC 640 ml
T7 Acephate 75% SP 400 gm
T8 Dinotefuron 20% WG 80 gm
T9 Control Water spray

The bio-efficacy effect of different spray schedule on paddy plant and the treatment wise yield data of paddy crop is summarized in the Table 6 and Table 7 below.

Table 6: The bio-efficacy of different treatments on Paddy Crop
Treatment BPH/hill WBPH/hill GLH/hill
PT 1 DAT 3 DAT 7 DAT 10 DAT PT 1 DAT 3 DAT 7 DAT 10 DAT PT 1 DAT 3 DAT 7 DAT 10 DAT
T1 22.54
(4.80) 0.89
(1.18) 1.00
(1.22) 1.31
(1.35) 1.76
(1.50) 15.06
(3.94) 0.61
(1.05) 0.79
(1.14) 1.19
(1.30) 1.26
(1.33) 9.91
(3.23) 0.52
(1.01) 0.61
(1.05) 0.70
(1.10) 0.79
(1.14)
T2 21.92
(4.73) 0.93
(1.20) 1.12
(1.27) 1.63
(1.46) 1.89
(1.55) 15.62
(4.01) 0.83
(1.15) 1.01
(1.23) 1.27
(1.33) 1.34
(1.36) 10.33
(3.29) 0.49
(0.99) 0.69
(1.09) 0.78
(1.13) 0.92
(1.19)
T3 22.52
(4.80) 6.59
(2.66) 7.97
(2.91) 9.59
(3.18) 11.97
(3.53) 15.66
(4.02) 3.30
(1.95) 4.67
(2.27) 6.12
(2.57) 7.67
(2.86) 11.03
(3.40) 3.12
(1.90) 4.01
(2.12) 4.96
(2.34) 6.01
(2.55)
T4 23.14
(4.86) 1.02
(1.23) 1.26
(1.33) 1.96
(1.57) 2.29
(1.67) 15.92
(4.05) 0.91
(1.19) 1.11
(1.27) 1.33
(1.37) 1.46
(1.40) 10.32
(3.29) 0.66
(1.08) 0.82
(1.15) 0.98
(1.22) 1.02
(1.23)
T5 22.33
(4.78) 5.46
(2.44) 6.32
(2.61) 7.45
(2.82) 8.29
(2.96) 15.03
(3.94) 2.67
(1.78) 3.81
(2.08) 4.16
(2.16) 5.22
(2.39) 11.00
(3.39) 1.02
(1.23) 2.56
(1.75) 3.25
(1.94) 4.01
(2.12)
T6 22.62
(4.81) 1.01
(1.23) 1.13
(1.28) 1.89
(1.55) 2.58
(1.75) 17.05
(4.19) 0.92
(1.19) 1.15
(1.28) 1.39
(1.37) 1.68
(1.48) 10.59
(3.33) 0.89
(1.18) 1.01
(1.23) 1.12
(1.27) 1.23
(1.32)
T7 23.01
(4.85) 8.12
(2.94) 10.25
(3.28) 12.01
(3.54) 15.45
(3.99) 15.02
(3.94) 4.10
(2.14) 5.68
(2.49) 7.62
(2.85) 9.68
(3.19) 11.01
(3.39) 4.69
(1.28) 5.01
(2.35) 6.23
(2.59) 7.12
(2.76)
T8 23.11
(4.86) 2.36
1.69) 4.01
(2.12) 5.45
(2.44) 7.26
(2.79) 15.69
(4.02) 1.81
(1.52) 2.29
(1.67) 3.06
(1.89) 4.89
(2.32) 10.18
(3.27) 1.89
(1.55) 2.05
(1.60) 2.85
(1.83) 3.16
(1.91)
T9 22.90
(4.84) 26.89
(5.3) 30.45
(5.56) 36.78
(6.11) 42.56
(6.56) 16.10
(4.07) 19.01
(4.42) 24.75
(5.02) 29.29
(5.46) 34.49
(5.92) 10.34
(3.29) 13.56
(1.75) 16.45
(4.12) 19.85
(4.51) 22.1
(4.76)
2
SEm ± - 0.017 0.012 0.023 0.010 - 0.009 0.025 0.009 0.020 - 0.022 0.032 0.009 0.008
CD 5% NS 0.050 0.035 0.070 0.030 NS 0.026 0.075 0.028 0.062 NS 0.066 0.096 0.027 0.024
* PT: Pre-treatment; DAT: Days after treatment; SEm ±:Standard Errors of Means; CD 5%: Critical Difference
* Value in Parentheses is v(x+0.5) transformed value

Table 7: Yield of Paddy Crop

Treatment Yield (kg/ha)
T1 5107
T2 5013
T3 4291
T4 5096
T5 4576
T6 5002
T7 4125
T8 4652
T9 3268
SEm ± 21.96
CD 5% 5.25
*SEm ±: Standard Errors of Means; CD 5%: Critical Difference
Evaluation of Phytotoxicity
Visual observation on phytotoxicity were recorded for leaf injury on tip/surface, Epinasty/Hyponasty, and wilting, etc. on 0-10 scale (as below) at 3, 5 and 10 days after application from ten plants and then average was taken.
SCORE PHYTOTOXICITY (PERCENT)
0 No phytotoxicity
1 1 – 10
2 11 – 20
3 21 – 30
4 31 – 40
5 41 – 50
6 51 – 60
7 61 – 70
8 71 – 80
9 & 10 Complete destruction

DAA = Days after application N= Necrosis L = Leaf injury to tip/surface
E/H = Epinasty/Hyponasty V = Vein Clearing W = Wilting
Table 8: Phytotoxic effect of different treatments on the paddy crop after first application.
Treatment Volume of formulation (gm/ml) 3 DAA 5 DAA 10 DAA
N L E/H V W N L E/H V W N L E/H V W
T1 640 gm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T2 640 gm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T3 600 ml 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T4 640 ml 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T5 320 ml 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T6 640 ml 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T7 400 gm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T8 80 gm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
T9 Water spray 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

It is clear from table 8 that no phytotoxicity was observed with any of the treatment at all the doses when observed at 3, 5, and 10 DAA (days after application) after each application.
The aforementioned trial results indicate that the synergetic insecticidal composition of fenobucarb, buprofezin, andacephate (WDG) of present invention is most effective against all the target insects with almost negligible insects even 10 DAA and better crop condition i.e. fresh green leaves with green colour, strength of plant is good with better growth. Similar effects were found in the case of emulsifiable compositions at both the concentrations. Acephate 75% SP and Fenobucarb (BPMC) 50% EC composition failed to show any effect. Also from Table 8 it is clear that the novel composition had nophytotoxicity on paddy crop when analysed at 3, 5, and 10 Days after application.
From the foregoing it will be observed that numerous modifications and variations can be effectuated without departing from the true spirit and scope of the novel concepts of the present invention. It is to be understood that no limitations with respect to the specific embodiments illustrated is intended or should be inferred. It should be understood that all such modifications and improvements have been deleted herein for the sake of conciseness and readability but are properly within the scope of the following claims.

We claim:

1. A synergistic insecticidal composition, comprising: (a) buprofezin; (b) fenobucarb; and (c) acephate.
2. The synergistic insecticidal composition as claimed in claim 1, wherein buprofezin is present in an amount in the range from 5-15 % w/w.
3. The synergistic insecticidal composition as claimed in claim 1, wherein acephate is present in an amount in the range from 2-4% w/w.
4. The synergistic insecticidal composition as claimed in claim 1, wherein fenobucarb is present in an amount in the range from 10-40% w/w.
5. The synergistic insecticidal composition as claimed in claims 1-4, wherein the composition is formulated as a water dispersible granule (WDG) or emulsifiable concentrate (EC).
6. The synergistic insecticidal composition as claimed in claims 1-5, wherein the composition optionally comprises (a) a wetting agent, (b) a dispersing agent, and (c) at least one filler; and wherein the formulation is in the form of water dispersible granules (WDG).
7. The synergistic insecticidal composition claims 1-5, wherein the composition optionally comprises (a) an emulsifier, (b) at least one co-solvent, and (c) a solvent; and wherein the formulation is in the form of an emulsifiable concentrate (EC).
8. The synergistic insecticidal composition as claimed in any of the preceding claims, wherein the composition effectively controls target insects, is non-phytotoxic and enhances the vigour/yield of the plant.