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Plantwise Technical Factsheet

raspberry yellow rust (Phragmidium rubi-idaei)

Host plants / species affected
Rubus idaeus (raspberry)
List of symptoms/signs
Leaves  -  abnormal colours
Leaves  -  abnormal leaf fall
Leaves  -  fungal growth
Leaves  -  necrotic areas
Whole plant  -  early senescence
Symptoms
Spermogonia are small <1 mm diam) bright orange, slightly raised spots on the adaxial (upper) surface of leaves of primocanes (first-year canes) and mainly on the lower leaves of the lateral shoots of fruiting canes. Obvious yellow aecia appear later on the adaxial leaf surface as orange rings (0.5-2.0 mm diam) with the old spermogonia in the centre of the ring. A secondary aecial ring may develop around the first-formed ring. Yellow aecia sometimes occur on petioles, pedicels and sepals. Necrotic lesions may develop around the aecia leading to a 'shot-hole' effect as necrotic tissue falls out of the leaf.

Yellow uredinia appear on the abaxial (lower) leaf surface immediately beneath the old aecia on leaves of both primocanes and fruiting canes. Occasionally they appear on the internodes of primocanes and on petioles, sepals and mature fruit. Yellow uredinia appear throughout summer on new leaves of primocanes. Leaves affected by uredinia may show 'green islands' on the adaxial surface. In late summer and autumn black teliospores appear amongst the yellow uredinia. By late summer all the pustules are covered with black teliospores. Severely affected leaves may be shed.

Impact
Infection at the uredinial stage can cause some loss of vigour; when leaves are severely infected this rust causes premature defoliation and the disease may therefore increase the risk of severe winter injury in growing regions that experience hard winters.
Related treatment support
 
External factsheets
University of California IPM Pest Management Guidelines, University of California, 2009, English language
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