Plant Rust Diseases

Rust diseases are caused by a group of fungi causes rusty brown, orange or yellowish spots or stripes, normally on leaves and stems; but sometimes on flowers or fruit.
These usually occur as individual spots or stripes.
There are over 4000 different types of rust species. Most rusts are specialised diseases which affect only one type or group of plants (ie. Carnation rusts do not affect corn and vice versa).
Rust spores spread in the wind, by insects, by rain, by irrigation and by other animals.
Spores can blow into your garden from more than 100 km away.
Rusts Affects a wide range of plants, particularly grasses, grain crops (including corn), vegetables (beans & asparagus), pineapple, apple, coffee, carnations & snapdragons.
Some plants affected by rust:

Beans affected by the fungus Uromyces appendiculatus

Carnations affected by Uromyces dianthi

Chrysanthemums affected by Puccinia chrysanthemi

English marigold affected by Puccinia lagenophorae

Fuchsias affected by Pucciniastrum epilobii

Iris affected by Puccinia iridis

Peach affected by Tranzschelia discolor

Pelargoniums affected by Puccinia pelargonii-zonalis

Poplars affected by Melampsora medusae and M. larici-populina

Raspberry affected by Phragmidium rubi-idaei

Roses affect by Phragmidium mucronatum

Snapdragons affected by Puccinia antirrhini

Turf grasses affected by Puccinia spp. and Uromyces spp.

 

Control: Grow resistant varieties of plants wherever possible. Chemicals which may be used include Sulphur, Mancozeb, Zineb, Oxycarboxin. Drench seed of susceptible plants, in a disinfectant, such as a weak bleach solution, or in a suitable fungicide before planting. Benlate is not suitable for the control of rust.

 

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