Category Archives: Diseases

Aster Yellows

This disease is caused by a microorganism, a mycoplasma-like organism (MLO), which is spread by the 6-spotted leafhopper, aka aster leafhopper(Macrosteles quadrilineatus). The leafhoppers pick it up while sucking the sap of diseased plants. This aster disease hits in early summer and affects about 200 species of ornamentals, vegetables, and non-woody fruit plants. It’s a common disease of many annuals, […]

Cabbage Yellows

Yellows of cabbage is a fungal wilt disease caused by Fusarium oxysporum Please see the full article, “Fusarium Wilt“, for information on symptoms and treatment. Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Fusarium oxysporum Plants Affected  infects only plants in the cabbage family (Brassicaceae): cabbage mustards cauliflower broccoli turnips radish horseradish Signs & Symptoms Whole […]

White Blister

Also known as White Rust. Physical Description  Google Images Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Albugo candida Lifecycle   Plants Affected   Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   Treatment   Prevention & Control   Cultural Controls: Habitat: […]

Rhizoctonia (stub)

Quick Intro Physical Description   Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Lifecycle   Plants Affected cabbage Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   Treatment Prevention & Control   Cultural Controls: Habitat: Temperature & Humidity:   Mulching & Cultivation […]

Pink Rot (stub)

Also known as Sclerotinia rot, Blossom blight,Cottony rot, Crown rot, Drop, Water soft rot, White mold. And is very similar to Onion white rot or Mouldy nose (Sclerotium cepivorum) in alliums. Physical Description  Google Images Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Sclerotinia spp. Lifecycle   Plants Affected cabbage celery lettuce tomato Plants Unaffected sugar beet spinach cereals Geographical Range   Signs & […]

Alternaria Leaf Spot (stub)

Quick Intro see also Early Blight Physical Description Google Images Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Cole Crops: Alternaria brassicae Alternaria brassicicola Almond Alternaria alternata Lifecycle   Plants Affected  cabbage Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   […]

Fusarium Wilt

Fusarium is a soil-borne fungus that can survive for a decade or more in dormant stages. It enters the plant through roots and invades its water distribution network, where the fungi partially or completely block the vascular tissues, usually by gum-like formations, causing wilting and eventually death of the plant. General Description Widespread fungus that affects a wide […]

Downy Mildew (stub)

Quick Intro Physical Description   Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Lifecycle   Plants Affected  cabbage Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   Treatment Prevention & Control   Cultural Controls: Habitat: Temperature & Humidity:   Mulching & Cultivation […]

Damping Off (stub)

Quick Intro Physical Description Google Images Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Lifecycle   Plants Affected   Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   Treatment Prevention & Control   Cultural Controls: Habitat: Temperature & Humidity:   Mulching […]

Black Rot (stub)

Quick Intro Physical Description Google Images Species & Taxonomy Kingdom: Phylum: Class: Order: Family: Genus Species: Xanthomonas campestri Lifecycle   Plants Affected   Plants Unaffected   Geographical Range   Signs & Symptoms Whole Plant Leaves Flowers   Fruit Roots/Tubers How to Positively Identify   Treatment Prevention & Control   Cultural Controls: Habitat: Temperature & Humidity:   […]