Australia

Chocolate spot

Botrytis fabae

Description

Chocolate spot is caused by two Botrytis fungi. Botrytis fabae is the most common cause and only affects broad beans. Botrytis cinerea can cause very similar symptoms, and this fungus also causes grey mould on a very wide range of plants. Chocolate spot can be very damaging, in some cases causing flower loss, with severe attacks resulting in whole plant collapse. It is worse in cool, damp, overcrowded conditions. This disease appears from late winter on autmn sown crops, but is seen from mid-spring on spring-sown broad beans.

No other beans including runner and French beans are affected, although common vetch and agricultural field beans sometimes used as green manures can be infected.

Symptoms

You may see the following symptoms:

Small round, red-brown spots on all parts of the plant.

Under favourable conditions these spots expand aggressively and leaves shrivel.

Stem infections may cause the plants to collapse.

Pesticides
Aprisco 900 WG
intensity: ★★★
Bravo
intensity: ★★★
Bravo Weather Stik
intensity: ★★★
Cavalry Weatherguard
intensity: ★★★
Cherokee 900
intensity: ★★★
Conan 500
intensity: ★★★
Conan 720 SC
intensity: ★★★
Cupro Isagro 375 WG
intensity: ★★★
Dithane Rainshield Neo Tec
intensity: ★★★
FMC Chlorothalonil 720
intensity: ★★★
FMC Chlorothalonil Bond 720
intensity: ★★★
Frenta 750 WG
intensity: ★★★
Howzat SC
intensity: ★★★
Isacop
intensity: ★★★
Kocide Blue Xtra
intensity: ★★★
Manzate DF
intensity: ★★★
Neoram 375 WG
intensity: ★★★
Ospray Copper Oxychloride-WP
intensity: ★★★
Penncozeb
intensity: ★★★
Penncozeb 750 DF
intensity: ★★★
Polyram DF
intensity: ★★★
Rotam Aprisco
intensity: ★★★
Rotam Winner Mancozeb WP
intensity: ★★★
tradewyns Blu-Cop 400DF
intensity: ★★★
Uniguard 500 WP
intensity: ★★★
Unizeb Disperss 750 DF
intensity: ★★★
Arysta LifeScience Copper Oxychloride 50 WP Fungicide/Bactericide
intensity: N/A
Arysta LifeScience Copper Oxychloride WP Fungicide/Bactericide
intensity: N/A
Arysta LifeScience Mancozeb 750 WG
intensity: N/A
Barmac Copper Oxychloride
intensity: N/A
Barrack 720
intensity: N/A
Barrack Betterstick
intensity: N/A
Blue Shield DF
intensity: N/A
Boomer
intensity: N/A
Chlornil 720 SC
intensity: N/A
Chloronil Pro
intensity: N/A
Chlorothalonil
intensity: N/A
Clash Dry 900 WG
intensity: N/A
Clash Storm Guard 720 SC
intensity: N/A
Echo 720
intensity: N/A
Fortress 500
intensity: N/A
Isagro Neoram 375 WG
intensity: N/A
Liquicop
intensity: N/A
Manco 750 WG
intensity: N/A
Mancoflo
intensity: N/A
Mancoflo 420 SC
intensity: N/A
Manzeb
intensity: N/A
Metapris 500 SC
intensity: N/A
Motac 500 SC
intensity: N/A
Pacific Echo 500 SC
intensity: N/A
Sumiclex 500
intensity: N/A
Sumisclex Broadacre
intensity: N/A
Transact
intensity: N/A