Brassica Disease

The major diseases of Brassica vegetables are Black rot clubroot Downy mildew Fusarium wilt soft rot and Turnip mosaic virus 2. At least three species of Alternaria can cause serious losses in brassicas.

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It occurs on many brassica crops including Brassica oleracea types eg broccoli cabbage collard and Brassica rapa types eg bok choi tatsoi komatsuna see photos.

Brassica disease. Campestris is considered one of the most important diseases of brassicas worldwide. Blackleg of cabbage and other crucifers Phoma lingam. Blackleg Leptosphaeria maculans Blackleg fungus commonly affects the stems and leaves of vegetable brassicas.

The lesions are light brown with a purplish outline which often contain pinhead-sized black dots. Oospores serve as primary inoculum for this disease and can survive for many years in soil or as a contaminant of seeds. At its most severe it can cause complete crop loss but this is less likely under UK conditions than in warmer climates.

Heavy winter frosts -4C and below will damage heads of. Have the cool conditions necessary to produce quality summer brassica crops. Brassica crops contain naturally occurring chemicals called glucosinolates.

Blackleg Leptosphaeria maculans Blackleg fungus commonly affects the stems and leaves of vegetable brassicas. However it regularly caused significant losses in marketable yield in the UK in the late 1990s particularly in autumn and winter crops. Clubroot Plasmodiophora brassicae Damping off Fusarium or Pythium species Downy mildew Hyaloperonospora.

Fungal Pathogens Club root of crucifers Plasmodiophora brassicae This disease causes the roots to become swollen and distorted and. Brassica Diseases Guide This best-practice guide covers the 13 main diseases of horticultural brassicas that cause economic losses to growers in the UK. These chemicals break down in the soil to produce compounds that inhibit the growth of disease producing organisms such as the take-all fungus which is regarded as one of the most serious root diseases of wheat.

Plant Diseases White or Tan Spots on Brassica Leaves White leaf spot is a fungal disease of cruciferous vegetables brassicas caused by the pathogen Mycosphaerella capsellae which is also known as Pseudocercosporella capsellae. Fungus and fungus-like diseases. Sporangia are produced in the pustules and are spread by wind rain or insects to neighboring plants.

A range of beneficials are available to assist in the management of these pests for example parasitoids of caterpillars. Key pests of brassicas include caterpillars aphids slugs snails weeds and a range of fungal bacterial and virus diseases such as clubroot downy mildew and white blisterrust. Warm to hot conditions especially at night can cause problems such as bolting in cabbage and poor head quality in cauliflower and broccoli.

Cultural physical biological or chemical controls or a combination of these controls integrated pest management are used for disease control 2 3. Sexual stage Leptosphaeria maculans More info University of. Fusarium yellows of cabbage and.

Sclerotinia Stem Rot And Watery Soft Rot. Stem damage can lead to cankering and severing of the plant at the base. Applied Horticultural Research New South Wales Department of Primary Industries AgHort Consulting Department of Agriculture have allowed us to use photographs from their collections.

Stem damage can lead to cankering and. Infection is generally favored by cool 13-18C 55- 64F wet weather in the form of prolonged dews or fog.

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