Rusts

Ipswich, England, United Kingdom

pear rust is a fungal disease of pear trees, causing bright orange spots on the leaves. It also affects junipers, causing perennial canker-like swellings on the branches.

Ipswich, England, United Kingdom

Cradley, Malvern, Worcs

Puccinia podophylli on May Apple. Bethabara Park, 04/11/2012

Aecia of Puccinia podophylli on May Apple. Bethabara Park, 04/11/2012

North Carolina, United States

Millstone, New Jersey, United States

Christmas, Florida, United States

Hrault, Languedoc, FRANCEScanned Slide from May 2001

2011-05-07 Burgenland, district Mattersburg (Kogelberg, 310 msm Quadrant 8264/4).See comments here.

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true lowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Vegetation producing pustules called uredia. Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true flowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Urediniospores produced by orange vegetation producing pustules uredia, Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Motic B2-211A, magnification 1.000 x, oil, in water.Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true lowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true lowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Vegetation producing pustules called uredia. Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...

2011-05-07 Burgenland, district Mattersburg (Kogelberg, 310 msm Quadrant 8264/4).Uromyces pisi-sativi is well-known for infecting Euphorbia cyparissias - here however you see the fungus on two other Euphorbia species: in this habitat, locally only those two Euphorbiae are present - and of both there exist infected individuals.Infected ones look completely different from non-infected plants, they remain sterile and won't even develop flowering buds; and they all show on the underside of leaves the marks of Uromyces (see second shot).For U. pisi-sativi there's a long list of synonyms - click here, Index Fungorum: Species Fungorum.

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true lowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Normal and infected plants intermixed in large groups. Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...

Uromyces pisi-sativi, syn.: Uromyces pisi, Puccinia pisiPea RustSlo.: grahova rja Dat.: April 25. 2011Lat.: 46.33889 Long.: 13.53691Code: Bot_509/2011_DSC7362 Habitat: Relatively dry sandy grassland, grazed by sheep, shallow soil, almost flat terrain, full sun, exposed to direct rain, average precipitations ~ 3.000 mm/year, average temperature 8-10 deg C, elevation 540 m (1.800 feet), alpine phytogeographical region.Substratum: Euphorbia cyparissias plantPlace: above the road to Pluna village, Bovec basin, East Julian Alps, Posoje, Slovenia EC Comments: This rust fungus modifies its host plant Euphorbia cyparissias. Infected plants usually don't produce fertile flowers and are much more slender and taller than normal. But they form a kind of pseudo-flowers, a rosette of leaves at the top of stalks, resembling true lowers. Fungus produces nectar similar to nectar of healthy plants. It attracts ants and other insects, both on healthy and infected plants. For over 100 years this host-pathogen pair has been subject to much speculation concerning the function of nectar-producing spermatia. Today, it is generally assumed that they are produced to attract insects for fungal fertilization (more in Ref.: 4.).Urediniospores produced by orange vegetation producing pustules uredia.Urediniospores finely warty, dimensions: 24.0 (SD = 1.2) x 21.5 (SD = 0.7) micr., Q = 1.12 (SD = 0.07), n = 25. Motic B2-211A, magnification 1.000 x, oil, in water.Ref.: (1) www.agroatlas.ru/en/content/diseases/Fabacee/Fabacee_Urom...(2) www.ncbi.nlm.nih.gov/pubmed/10636829 (3) www.uni-graz.at/walter.obermayer/plants-of-styria/images/...(4) www.amjbot.org/cgi/content/full/87/1/48#F1(5) e-collection.library.ethz.ch/eserv/eth:23187/eth-23187-01...