Plant protecting and regulating compositions – Plant growth regulating compositions
Patent
1999-09-01
2000-08-22
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
504364, A01N 2530, A01N 5908
Patent
active
06107246&
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a herbicidal formulation and method of controlling plants.
This invention has particular but not exclusive application to an environmentally friendly herbicide, and for illustrative purposes reference will be made to such application. However, it is to be understood that this invention could be used in other applications, using components which are selected on criteria other than environmental sensitivity, such as broad efficacy, appealing colour or odour or such like.
Herbicidal formulations presently base their efficacy on systemic invasion of a plant, causing disruption of the plant's biological function leading to plant death and subsequent decomposition. Herbicides almost always leave an undesirable residual in the soil which is ingested into surviving flora and fauna, leading to undesirable health and safety effects. Additionally, synthetic formulations frequently contain intractable poisons and toxins which accumulate, such as polychlorinated biphenols present in minute quantities in popular defoliants such as 24D and 245T, otherwise known as agent orange. Traditional herbicides are not formulated from natural materials or at least include an active ingredient of synthetic origin, and such synthetic materials are often associated with allergies, hypersensitivities and poor health.
Moreover, traditional herbicides are not intrinsically safe. The manufacturers of such formulations will go no further than to say that traditional herbicides are not known to cause harm, a statement which falls short of saying that such herbicides are harmless.
The present invention aims to alleviate one or more of the above disadvantages and to provide a herbicidal formulation and method of controlling plants which will be reliable and efficient in use. This invention also aims to provide a herbicidal formulation and method of controlling plants which is non-systemic, biodegradable and environmentally friendly
With the foregoing in view, this invention in one aspect resides broadly in a herbicidal formulation including:
Preferably the salt is a metal halide, such as sodium chloride in aqueous solution in the range of from 125 g/L to saturation. In a preferred embodiment, the salt is sea salt in the range of from 200 g/L to 300 g/L, and more preferably, 250 g/L. it will be appreciated that the concentration of the salt may be determined by a consideration of the cost of same which decreases with concentration in balance with the efficacy of the mixture which increases with concentration.
Suitably, the microbiological food is a carbohydrate such as a sugar. The sugar may be any sugar or mixture of sugars, such as the sugar known by the trade name aspartame but preferably is a mono- or disaccharide or closely related thereto, and more preferably in the form of a sugar syrup such as molasses, treacle or such like. The sugar is preferably in the range of from 15 g/L to 25 g/L in the mixture.
The detergent may be any detergent known in the art for use in herbicidal formulations having the purpose, for example, of causing the formulation to stick to the surface of the target plant, and for some plant species, to break down the waxy coating on the exterior walls of the target plant. The preferred embodiment includes an alpha olefin sulfonate having a chain length in the range of from 12 to 14, however, it is to be appreciated that preferred detergents are completely biodegradable and environmentally friendly. Other detergents may be used such as d-limonene or materials containing same, such as for example the cleanser known by the trade mark ORANGE SQUIRT sold by Citrus Resources Australia.
The oxidant is also preferably environmentally friendly, such as hydrogen peroxide or such like, and preferably does not adversely affect the other components of the herbicidal formulation. Other oxidising agents may be used such as alkali perinanganates, perchlorates, dichromates and such like.
It will also be appreciated that additives may be substituted for one or more of the above preferred components if such add
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Van Keer et al. "Weed problems in a transitional upland rice based swidden system in northern Thailand" Highland Farming: Soil and the Future? Proceedings, Chiangmai, Thailand, Dec. 1995.
Clardy S. Mark
Pizzeys
Sarussi Steven J.
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