Use of carboxamides of the formula (I) in which A, R 1 , M, Q and R are as defined in the description for controlling certain rust fungi, such as soya bean rust and coffee rust, in crop protection.
1. A method of controlling Phakopsora pachyrhizi rust fungi in soya bean plants comprising treating soya bean plants in need of protection from rust fungi with N-(3′,4′-dichloro-5-fluoro-1,1′-biphenyl-2-yl)-3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxamide.
2. A method according to claim 1 wherein the soya bean plants are transgenic soya bean plants.
3. A method of controlling Phakopsora pachyrhizi rust fungi in soya bean plants according to claim 1 comprising treating a crop in need of protection from rust fungi with
(a) N-(3′,4′-dichloro-5-fluoro-1,1′-biphenyl-2-yl)-3-(difluoromethyl)-1-methyl-1H-pyrazole-4-carboxamide as the only fungicidally active compound, and
(b) optionally, extenders and/or surface-active agents.
4. A method according to claim 3 wherein the soya bean plants are transgenic soya bean plants.