Common leaf spot (CLS) is caused by the fungus Pseudopeziza trifolii and mainly occurs in the cooler, moister winter months. This disease is common throughout NZ. Quality of conserved feed may be lost.

 

Identification

First symptoms are buff coloured, circular spots varying in size, with a darker fringe, on the upper surface of the leaves. In severely infected pastures leaves can curl up and turn brown. CLS occurs mainly in cool, moist, winter conditions and is exacerbated by infrequent grazing.

 

Spread

Spores produced by the fungus are forcibly ejected into the air, where they spread infection to new sites.

 

Prevention and management

Timely grazing or cutting minimises damage of infected pastures.

 

 

Pseudopeziza leaf spot of clover. (Photo: MAF, Lincoln)