Rust
Uromyces betae
Rust is caused by the fungus Uromyces betae. Despite its wide geographical distribution, its economic impact is often considered to be far less important than powdery mildew or Cercospora. This is mainly explained by the fact that it appears later in the season. In some regions (ex. along sea coasts) it can sometimes cause serious damage.
Development factors
Requires relatively cool temperature (between 15° and 22°C) for its development but will tolerate warmer temperatures as well. The key factor is moisture for long periods.
SYMPTOMS EARLY STAGE:
Small circular pustules, redorange to brown and often surrounded by a yellow halo appear on both sides of the leaves and produce a fine, orange powder.
LATER STAGE: Leaves dry up.
Pesticides
Cupro Isagro 375 WG
intensity: ★★★
Isacop
intensity: ★★★
Neoram 375 WG
intensity: ★★★
Ospray Copper Oxychloride-WP
intensity: ★★★
tradewyns Blu-Cop 400DF
intensity: ★★★
UniShield 800 DF
intensity: ★★★
Arysta LifeScience Copper Oxychloride 50 WP Fungicide/Bactericide
intensity: N/A
Arysta LifeScience Copper Oxychloride WP Fungicide/Bactericide
intensity: N/A
Barmac Copper Oxychloride
intensity: N/A
Barmac Zineb
intensity: N/A
Isagro Neoram 375 WG
intensity: N/A
Liquicop
intensity: N/A