4-Aminoquinazoline derivatives having fungicidal, anti-insect and acaricidal properties

An agricultural or horticultural preparation comprising, as active ingredient, a compound of formula (I):

• ##STR6## (wherein:
• R.sup.1 represents an alkyl group, a cycloalkyl group, an alkenyl group or a benzyl group;
• R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom;
• X represents an alkylene group;
• and
• n represents 0 or 1)
• or a salt or hydrate thereof, in admixture with an agriculturally or horiculturally acceptable carrier or diluent.

A method of protecting growing plants and/or seeds against bacterial, fungal, insect or mite attack by applying to the seeds, plants or soil a compound of formula (I):

• ##STR7## (wherein:
• R.sup.1 represents an alkyl group, a cycloalkyl group, an alkenyl group or a benzyl group;
• R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom;
• X represents an alkylene group;
• and
• n represents 0 or 1)
• or a salt or hydrate thereof.