Imperial Chemical Industries Limited

Brian Graham White

Charles Brian Barlow

Clive Dudley Tomlin

David Cartwright

David J Collins

Michael Joseph Brown

Martin R Parham

A process of killing or defoliating trees, which comprises applying to the tree a bipyridylium zwitterion of the formula: ##STR1## or an acid addition salt thereof.

Arboricide

A process of selectively killing or severely damaging oats growing in cereal crops other than oats by applying to the crop area, in an amount sufficient to kill or severely damage the oats, but insufficient to damage the cereal crop substantially, a 4,4'-bipyridylium diquaternary salt.

Selective herbicides

Compositions and methods for combatting insects, fungal and bacterial plant pests are disclosed wherein the active ingredient is a compound of the formula Z--NH--Y wherein X is selected from the group consisting of a pyrazinyl radical bearing one to three substitutents, and pyrimidinyl and pyridazinyl radicals bearing two to three substituents; and Y represents phenyl, naphthyl, pyridyl or diazinyl bearing at least one substituent; the substituents in each case selected from the group consisting of halogen, cyano, nitro, trifluoromethyl, lower alkoxy, lower alkylthio, benzylthio, lower alkyl and amino, provided that (a) the compound bears at least four substituents of which at least two are halogen atoms, and (b) where X represents a pyrimidinyl radical and Y represents a pyridyl radical there is at least one substituent other than halogen present.

Certain diazines as plant pesticides

The present invention relates to polysubstituted aryl amino pyridines herbicidal and pesticidal compositions useful, inter alia, in controlling pests including fungal infections of plants, and in inhibiting the growth of unwanted vegetation; to chemical compounds useful as active ingredients of such compositions; to methods of controlling pests including fungal infections of plants: and to methods of inhibiting the growth of unwanted vegetation.

Certain aryl amino pyridines

Pesticidal compounds of formula I where Z represents a halo-substituted naphthyl group or a group of formula II wherein X.sup.1, X.sup.2, X.sup.3 and X.sup.4 are halogen, and Y is halogen, trifluoromethyl, nitro or alkyl: ##SPC1##

Chemical compounds and compositions

A solid complex of a herbicidal bipyridylium salt in combination with urea or thiourea having the formula:

Growing community of inventors

Crowthorne, United Kingdom

Brian Graham White