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Rust disease on raspberries is a fairly common problem, and can cause concern when high levels of the disease are present. However, whilst it can be a very conspicuous disease, affected plants still usually give a satisfactory yield of fruit.
Raspberry rust (sometimes called raspberry yellow rust) is a disease of the foliage of raspberries, caused by the fungus Phragmidium rubi-idaei. The fungus produces a number of different types of spore depending on the time of year and, as these different spores are produced, so the appearance of the disease changes. The microscopic spores are produced in structures called pustules. Leaf wetness is needed for infection, so attacks are worst during prolonged wet weather.
You may see the following symptoms:
No fungicides are available to home gardeners for the control of raspberry rust.
The rust fungi are described as biotrophs; that is, they grow within the living tissues of the plant and extract nutrients from the cells. Although they do not kill tissues rapidly, heavy attacks by rusts can cause leaves to fall prematurely, which is the case with raspberry rust.
It is the spores produced in the orange pustules on the underside of the leaves that are mainly responsible for spreading the disease from leaf to leaf and plant to plant during the summer. Those produced in the black pustules in late summer are overwintering spores which, as well as surviving on the fallen leaves, can also become attached to the stems and to posts, wires, etc.
Infection is favoured by wet or humid conditions. The disease is therefore most problematic during wet summers and where air circulation through the canes is poor.
Unlike some other rust fungi the life cycle for raspberry rust does not involve an alternate host.
RaspberryRaspberry beetleRaspberry cane blightRaspberry leaf and bud miteRaspberry spur blightRaspberry virusesRust diseasesSpotted wing drosophila
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