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.

Two common bacterial leaf diseases in brassicas are bacterial...

Two common bacterial leaf diseases in brassicas are bacterial leaf spot (Pseudomonas syringae pv. maculicola) and black rot (Xanthomonas campestris pv. campestris). Both affect a range of brassica crops. Pseudomonas syringae is primarily a leaf pathogen whereas Xanthomonas campestris systemically infects the plant.

BSR causes secondary damage following infection by other...

BSR causes secondary damage following infection by other pathogens (e.g. dry rot) or through tissue damaged by insects or weather. It is caused by the bacterium Pectobacterium carotovorum and Pseudomonas marginalis pv. marginalis.

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 Hyaloperonospora parasitica, which...

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

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

DR, also known as black leg, is caused by the closely related fungi Plenodomus lingam and P. biglobosa. It can be highly destructive in swede, rape and kale, and occurs throughout NZ, most commonly in the lower South Island.

RS, caused by the fungus Neopseudocercosporella brassicae, occurs...

RS, caused by the fungus Neopseudocercosporella brassicae, occurs sporadically from season to season.

The three main brassica viruses are turnip yellows virus (TuYV...

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

SC, also known as watery soft rot, is caused by the fungal...

SC, also known as watery soft rot, is caused by the fungal pathogen Sclerotinia sclerotiorum, with many hosts including all brassicas. Infection occurs from air-borne spores or from over-wintering sclerotia (dormant survival spores) in the soil.

WB is a common oomycete disease of weed brassicas that can spread...

WB is a common oomycete disease of weed brassicas that can spread to crops, and is caused by the fungus Albugo candida. WB does not generally cause major damage in brassica crops although radish can be heavily infected.

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

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