Clover rust is caused by the fungus Uromyces trifolii-repens and is found occasionally on clover throughout NZ. It can cause loss of forage quality.

 

Identification

The rust pathogen produces brick-red pustules on the underside of leaves and on the petioles. Pustules on petioles cause characteristic twisting.

 

Prevention and management

Graze infected plants.

 

Rust on clover petioles (left) & leaf. (photo: MAF, Lincoln)