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US 4,397,678 AGranted
Plant growth regulators
AssigneesToshihiko Okamoto, Yo Isogai, Koichi Shudo, Susumu Sato
InventorsToshihiko Okamoto, Yo Isogai, Koichi Shudo, Soshiro Takahashi
Life of this patent
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Abstract
Plant growth regulators of the N-(4-pyridazinyl)urea and thiourea type are disclosed which exhibit excellent cytokinin-like activities and are useful for regulating plant growth in various manners, such as acceleration and suppression.
Claims4
An agricultural composition useful as a plant growth regulator comprising as an active ingredient a compound of formula:
- ##STR5## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, a halogen atom, a lower alkoxy group, an aryloxy group, a halomethyl group, a cyano group, an alkylthio group, a carboxy group or an alkoxycarbonyl group;
- X represents an oxygen atom or a sulfur atom;
- and n represents 1, 2 or 3;
- and when n is 2 or 3, R.sub.1 and R.sub.2 each may be different, in an effective plant-growth regulating amount, together with an inert carrier or diluent.
1 more element
A method of controlling plant growth which comprises contacting a plant or a part thereof with a compound of formula:
- ##STR6## wherein R.sub.1 and R.sub.2, which may be the same or different, each represents a hydrogen atom, a lower alkyl group, a halogen atom, a lower alkoxy group, an aryloxy group, a halomethyl group, a cyano group, an alkylthio group, a carboxy group or an alkoxycarbonyl group;
- X represents an oxygen atom or a sulfur atom;
- and n represents 1, 2 or 3;
- and when n is 2 or 3, R.sub.1 and R.sub.2 each may be different, in an amount effective for regulation of the growth of the plant involved.
1 more element
Dependencies are inferred from the claim text.