Plant protecting and regulating compositions – Plant growth regulating compositions – Organic active compound containing
Patent
1998-05-06
1999-12-07
Clardy, S. Mark
Plant protecting and regulating compositions
Plant growth regulating compositions
Organic active compound containing
A01N 3106, A01N 6500
Patent
active
059983353
DESCRIPTION:
BRIEF SUMMARY
This application has been filed under 35 U.S.C. 371 as the national stage of international application PCT/AU95/00739, filed Nov. 6, 1995.
BACKGROUND TO THE INVENTION
The present invention relates to a herbicidal composition having, as an active ingredient, a terpene compound, a terpene derivative, or an essential oil comprising a terpene compound or derivative. In particular, the herbicidal composition will comprise a pine oil, dipentene, pinene, a pine alcohol or a terpene compound or derivative derived from pine oil. A citrus oil or a terpene compound derived from citrus oil, e.g. limonene (1-methyl-4-(1-methylethenyl)-cyclohexene), may also be used.
Many herbicidal compositions presently on the market are highly toxic to humans and domestic animals. A herbicide having lower toxicity is desirable, particularly for use by the home gardener.
The active ingredient of the present herbicidal compositions has the advantage of being an environmentally friendly, natural product, which is unlikely to cause environmental pollution or create toxicity problems for humans or domestic animals.
SUMMARY OF THE INVENTION
The present invention provides a herbicidal composition, having as an active ingredient a terpene compound or derivative, which may be either naturally occurring or synthetic. (Natural pine oil, for example, is virtually unobtainable.)
Although the terpene compounds or derivatives are believed to be the active ingredients of the herbicidal compositions, the same herbicidal effect is found using "whole" essential oils, such as pine oils and citrus oils, comprising such terpene compounds or derivatives.
The addition of other essential or natural oils can enhance the activity of the preparation.
In a further aspect, the invention provides a method for controlling unwanted plant growth, wherein a terpene compound or derivative, an essential oil comprising a terpene compound or derivative, or a herbicidal composition having, as an active ingredient, a terpene compound or derivative or an essential oil comprising a terpene compound or derivative is applied to the unwanted plant or plants.
DETAILED DESCRIPTION OF THE INVENTION
The active ingredient of the present herbicidal compositions is a naturally occurring or synthetic terpene (e.g. dipentene, limonene or pinene) or terpene derivative (e.g. terpineol or a pine alcohol), or an essential oil (e.g. a pine or citrus oil), in either pure or diluted form. Examples of suitable citrus oils are orange, lemon, grapefruit, mandarin, tangerine or tangelo oil, and in particular orange oil.
Although the preferred active ingredient is a pine oil or a terpene compound or derivative derived from pine oil, other essential oils, terpenes and terpene derivatives may also be effective, e.g. citrus oils, citrus oil derivatives, terpenes or terpene derivatives derived from citrus oils, tea tree oil (Oil of Melaleuca) and eucalyptus oil. The major terpene derivative present in pine oil is terpineol. As with pine oil, the major terpene derivatives present in tea tree oil and eucalyptus oil are alcohol compounds, being terpinen-4-ol and cineole (eucalyptol) respectively.
In particular, dipentene, which is a synthetic derivative of pine oil predominantly comprising d,1-limonene, has been found to be effective.
In a preferred embodiment, the major active component of the herbicidal compositions is pine oil, a pine alcohol, pinene, dipentene or d-limonene. The last-mentioned compound is found in many essential oils and is the major active component of citrus oils.
1-Limonene has also been trialled, and appears to be as herbicidally-effective as d-limonene.
Tea tree and eucalyptus oils display very high herbicidal activity, but are currently high cost materials available in limited volumes. Therefore, until prices drop with increased world production, it is preferred that these oils be incorporated in the herbicidal compositions of the present invention as minor additives. Both tea tree oil and eucalyptus oil were found to enhance the herbicidal activity of an emulsion of pin
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Kiely Wayne Andrew
Selga John
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