AU595829B2 - Improvement in or related to herbicide composition - Google Patents

Description

COMMONWEALTH OF A STRALIA PATENT ACT 1952 COMPLETE SPECIFICATION (Original) FOR OFFICE USE 6 1 3c+ Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority: Related Art: ui~ (i~tL'Mt Conit Yns 1S "J) l 1- '4rni9j 4111d Iid^. mid crnj': Name of Applicant: Address of Applicant: Actual Inventor(s): Address for Service: DEFENSA INDUSTRIA DE DEFENSIVOS AGRICOLAS S/A Rua General Andrade Neves, 106 90.000-Porto Alegre-RS

BRAZIL

Leodonio Francisco SCHPOEDER Carlos Alberto MOMBACH Iraja Antonio Mendonca de OLIVEIRA DAVIES COLLISON, Patent Attorneys, 1 Little Collins Street, Melbourne, 3000.

Complete Specification for the invention entitled: "IMPROVEMENT IN OR RELATED TO HERBICIDE COMPOSITION" The following statement is a full description of this invention, including the best method of performing it known to us -1- I The present invention relates to an improved herbicide composition, and to its use, particularly in agriculture.

In particular this invention relates to a change of the formulation of trifluraline, a herbicide of the dinitroaniline group, which, just for this new formulation, allows facilitation of its usage, further the fact to allow its nonincorporation, without damage to its control of undesirable plants.

9 c Trifluraline has as one of its features a steam (vapour) -4 o pressure of 1.99x10 mm Hg to 29.5 C, which allows that its loss due to volatilization great, needing, therefore, its incorporation after usage,to a depth of about 10 to 12 cm.

This steam pressure can be changed by changing the At formulation components, which allow a decrease of the steam t^ pressure of the active principle by alteration of the

C

physical-chemical properties of the emulsion. First of all, the content of the active principle of the formulation is increased to a point of about saturation which is from t C 50 to 65%, most specifically 60%, allowing that the solvent C C content be minimised, thus allowing the decrease of the loss C Cr of volatilization of the active principle. Also, the f formulation is characterized by a content of surface active agents varying from 6 to 12%, preferably commerically available anionic and/or nonionic surface active agents.

To this formulation is added an agent of low volatibility, which aids in prevention of loss of the active principle due to evaporation. These agents can be selected from oils of the type: soybean oil; rice oil; corn oil; varied mineral oils. These agents are included in the formulation in the quantity from 0.1 to 10%. Finally, the formulation solvent must be such that it will not allow the formulation 0 to crystallize in a cold test (0 C by 7 days) pursuant to international standards. The solvent may, for example, comprise a mixture of aromatic hydrocarbon available on the market under several tradenames. It is preferably a mixture 2a- 1 2 3 4 6 7 8 9 11 12 13 14 16 17 18 19 c 21 22 23 24 S 26 27 28 29 00 I o a o 31 32 33 34 36 37 38 of xylene isomers, or another known as current C-9 of Pyrolisis, etc. The mixture of xylene isomers is preferred due to its higher dissolution power. To differentiate the present formulation from other trifluraline emulsifiable concentrates, there is added an oil soluble dye. Therefore, the preferred formulation is comprised of: Trifluraline 100% -50-65%; emulsifiers or surface active agents 6-12%; low volatility oils 0.1-10%; oil soluble dye 0.1-1.0%; appropriate solvent qsp 100%.

Accordingly, the present invention provides a herbicide composition comprising 50 to 65% by weight of trifluraline, 0.1 to 10% by weight of an oil of low volatility adapted to reduce loss of the trifluraline due to volatilization, 6 to 12% by weight of one or more anionic or non-ionic surface active agents, and 13 to 45.9% by weight of a liquid aromatic hydrocarbon solvent.

To NT~m~ ~cNr 0 900125. csdat,071,defensoaI. 2 _I I

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)1 ;1 i i a of xylene isomers, or another known as current C-9 Pyrolisis, etc. The mixture of xylene isomer s preferred due to its higher dissolution power. T ffferentiate the present formulation from other t luraline emulsifiable concentrates, there is add an oil soluble dye. Therefore, the preferred formu 'lon is comp-'ised of: Trifluraline 100% -50-65%; emul fiers or surface active agents 6-12%; low vol a.1lity oils 0.1-10%; oil soluble dye 0.1-1.0%; ap ropriate solvent qsp 100%.

The advantages ar:ising out from this new formulation of trifluraline are several, including the following: the active principle can be obtained from any source at a competitive cost when compared with other herbicides of the same spectrum, even more sophisticated and imported ones; the formulation has an increased spectrum of control of undesired plants: in pre-emergent use this formulation controls, in an efficient way, the "cip6 de veado and guanxuma", plants deemed as resistent to the active principle when incorporated traditionally with the formulation of 440 to 480 g/L; the formulation can be used solely or with a mixture with herbicides for large blades (grasses) in soybean cultivation, in conventional cultivation and in direct planting, in the cultivation of cotton, in brassica and in any other cultivation in which trifluraline is recommended; the formulation can be used through terrestrial or air means; it can be used prior or after the soybean being planted, although care must be taken when used prior to planting to avoid use in crusted soil after planting, the formulation can be lightly incorporated (2 cm), which, including, determines a decrease on the dosage to be used; the conditions for germination of seeds are the same for the good functioning of this herbicide, when lightly incorporated, the dosage reduction is of two thirds. In relation to costs, the new formulation is most inexpensive where it can be superfically incorporated or to 2cm, the Ii T V 'PiyO 4.

dosage falls by one third, that is, instead of using 3 liters per hectare, only 1 liter per hectare is used and, when used pre-emergent, even to 3 liters per hectare, this formulation is inexpensive and only about 40 to of the cost of the other most used superficial herbicide.

The percentage of control are among 90 and 100% of grammineous and over 50% for large blades as "cipo-deveado and the guanxuma"(Polygonum convolvus) (Sida rhombifolia), further to be active against large other specimens of undesirable plants when present in the cultivation of cotton, garlic, peanut, eggplant, brassical (broccoli, O"e, cauliflower, cabage and butter cauliflower), coffee in o formation, transplant onion plant, carrot, citrus, bean, string bean, sunflower, castor bean, manioc, red pepper, 'O I transplant tomato, soybein and okra. On pre-emergent 0 t Susage and PPI-Incorporation light (2cm) trifluraline shows good efficiency in the control of the Digitaria spp, Brachiaria plantagine, Echonochola spp and Cenchrus echinatus in the cultiv.tion of soybean and cotton. The S0 trifluraline 60%, being an emulsifiable concentrate, must 0 o8 be mixed in water to be used on soil with terrestrial or air 0 08 0 equipment. On terrestrial usages, the formulation must be 0"ooo used with low pressure atomizers, with remote fan sprays, Q0 8 apart, to 50cm high from the soil. The recommended o volume is of 200-300 1/ha. For usages in air means it is used from 40 to 50 liters/ha. As the product has action 0 only over herb seeds, the land must be well prepared, free of clods, residue of cultivation and undesirable plants already germinated, because these will not be controlled.

For the normal incorporation (10-12cm) a double disc harrow agricultural machine may be used, and this operation should be performed as soon as possible after the application of the herbicide and preferably not more than 8 hours after.

For the incorporation in light basis (2 cm), the agricultural machine to be used may be a one tooth rotary hoe machine, in a _UI i I medium velocity of 12 km/hour. In pre-emergent conditions a reactivation of the product must be realised through a light incorporation, with appropriate equipment, in the event of lack of rain among 5 and 7 days from the application.

The trifluraline 60% to be used, dependent with the application type and soil type: for PPI-Incorporation normal (10-12cm) in light soils (arenoses) the dosage is from 0.9 to 1.2 1/ha; in medium soils (arenose-argillous) the dosage is from 1.2 to 1.5 1/ha and in heavy soils (argillous) the dosage is from 1.5 to 1.8 1/ha, being enhanced that most increased dosages must be reserved to soils with high content of organic matter; for PPI-Incorporation-light (2cm) in heavy and medium soils, the dosage shall be S1/ha and in pre-emergent use, in heavy and medium soils, the I dosage shall be 3.0 1/ha, must be enhanced that don't be applied in soils with less of 3% of organic matter.

Claims (7)

1. A herbicide composition comprising 50 to 65% by weight of trifluraline, 0.1 to 10% by weight of an oil of low volatility adapted to reduce loss of the trifluraline due to volatilization, 6 to 12% by weight of one or more anionic or non-ionic surface active agents, and 13 to 45.9% by weight of a liquid aromatic hydrocarbon solvent.

2. A herbicide composition as claimed in claim 1, wherein the oil of low volatility is selected from one or more of soybean oil, rice oil, corn oil and mineral oil.

3. A herbicide composition as claimed in claim 1 or claim 2, wherein the surface active agent is an anionic surface active agent.

4. A herbicide composition as cluimed in any one of claims 1-3, wherein the surface active agent is a non-ionic surface active agent.

5. A herbicide composition as claimed in any one of claims 1-4, wherein the liquid aromatic hydrocarbon solvent is a mixture of liquid aromatic hydrocarbon solvents.

6. A herbicide composition as claimed in any one of claims 1-5, wherein the liquid aromatic hydrocarbon solvent is selected from xylene isomers. 900125,cSdat.71jdefensa 1 ,6 -7

7. A method of herbicidal treatment comprising applying a composition in accordance with any preceding claim to the surface of soil or incorporting into soil to a depth not greater than 2 cm. 7 8 9 11 12 13 14 00 o 16 0 17 0" 0 0 0 0 19 0 21 22 0 23 24 0 0 26 0 27 28 29 0 0 31 32 33 34 36 37 38 DATED THIS 25th January, 1990 DAVIES COLLISON Fellows Institute of Patent Attorneys of Australia. Patent Attorneys for the Applicant 90O125,c-Sdat.,07i ,defensa,1 ,7