Two Alternaria fungi, A. brassicae and A. brassicicola, cause...

Two Alternaria fungi, A. brassicae and A. brassicicola, cause these leaf spots on most brassica species.

The two common bacterial leaf diseases in brassicas are bacterial...

The two common bacterial leaf diseases in brassicas are bacterial leaf blight and Xanathamonas leaf blight (BLB). Both affect a range of crops and have a similar biology.

BSR causes damage as a secondary invader following infection by...

BSR causes damage as a secondary invader following infection by other pathogens (e.g. dry rot) or through tissue damaged by insects or weather. It is caused by the bacterium Erwinia carotovora.

CR, caused by the fungus Plasmodiophora brassicae, affects most...

CR, caused by the fungus Plasmodiophora brassicae, affects most brassicas, causing galls to form on roots and reducing yield.

Seedling brassicas can be attacked by DO, which covers a range of...

Seedling brassicas can be attacked by DO, which covers a range of fungi that cause plant death and gaps in establishing crops. Causal pathogens are Pythium and Fusarium spp. in the North Island, and Rhizoctonia solani in the South Island. Early infections are known as damping off, while later are known as wire stem. AGRICOTE Brassica provides early control of DO.

DM is caused by the fungus Peronospora parasitica, which infects...

DM is caused by the fungus Peronospora parasitica, which infects seedlings, leaves, flowering stems and seed pods.

DR, also known as black leg, is caused by the fungus...

DR, also known as black leg, is caused by the fungus Leptosphaeria maculans. It can be extremely destructive in swede, rape and kale crops, and occurs throughout NZ, most commonly in the lower South Island.

RS, caused by the fungus Mycosphaerella brassicicola, occurs...

RS, caused by the fungus Mycosphaerella brassicicola, occurs sporadically from season to season.

The three main brassica viruses are beet western yellows virus (BW...

The three main brassica viruses are beet western yellows virus (BWYV), cauliflower mosaic virus (CuMV) and turnip mosaic virus (TuMV). All are common in brassica crops throughout NZ.

SC, also known as watery soft rot, is a fungal pathogen with a...

SC, also known as watery soft rot, is a fungal pathogen with a wide range of hosts including all brassicas. Infection occurs from air-borne spores or from over-wintering sclerotia (dormant survival spores) in the soil.

WBR is a common fungal disease of weed brassicas that can spread...

WBR is a common fungal disease of weed brassicas that can spread to crops, caused by the fungus Albugo candida.

PM is caused by the fungus Erysiphe polygoni and is a common...

PM is caused by the fungus Erysiphe polygoni and is a common minor disease of brassicas, mostly in late summer and autumn.