Nigel Cattlin / Bluebell rust (Uromyces muscari) disease pustules in chlorotic area on Spanish bluebell (Hyacinthoides hispanica) leaf. Berkshire, England, UK. April.

Nigel Cattlin / Bluebell rust (Uromyces muscari) disease pustules on Spanish bluebell (Hyacinthoides hispanica) leaves. Berkshire, England, UK. April.

Nigel Cattlin / Faba bean rust pustules on Broad bean (Vicia faba) leaf caused by Fungus (Uromyces viciae-fabae). Berkshire, England, UK. August.

Nigel Cattlin / Faba bean rust pustules on Broad bean (Vicia faba) leaf caused by Fungus (Uromyces viciae-fabae). Berkshire, England, UK. August.

Nigel Cattlin / Faba bean rust pustules on Broad bean (Vicia faba) leaf caused by Fungus (Uromyces viciae-fabae). Berkshire, England, UK. August.

Nigel Cattlin / Faba bean rust pustules on Broad bean (Vicia faba) leaf caused by Fungus (Uromyces viciae-fabae). Berkshire, England, UK. August.

Nigel Cattlin / Antirrhinum rust (Puccinia arenariae), circular pustule on Snapdragon (Antirrhinum sp) leaf underside, photomicrograph. Berkshire, England, UK. August.

Nigel Cattlin / Antirrhinum or snapdragon rust (Puccinia antirrhini) pustules in a circular lesion on the underside of Snapdragon (Antirrhinum sp) leaf, August.

Nigel Cattlin / Field bean rust (Uromyces viciae-fabae) damage to Field bean (Vicia faba) crop. Berkshire, England, UK. August.

Nigel Cattlin / Field bean rust (Uromyces viciae-fabae) damage to Field bean (Vicia faba) crop. Berkshire, England, UK. August.

Nigel Cattlin / Broad bean rust (Uromyces vicia-fabae) on Broad bean (Vicia faba) leaf, notches made by Bean weevil (Chrysomelidae) around edge. Berkshire, England, UK. August.

Nigel Cattlin / Broad bean rust (Uromyces vicia-fabae) on Broad bean (Vicia faba) leaf, notches made by Bean weevil (Chrysomelidae) around leaf edge. Berkshire, England, UK. August.

Nigel Cattlin / Antirrhinum rust (Puccinia antirrhini) with pustules on underside of Snapdragon (Antirrhinum sp) leaf. Cultivated in garden, Berkshire, England, UK. August.

Nigel Cattlin / Rose rust (Phragmidium mucronatum) pustules on underside of ornamental Rose (Rosa sp) leaf. Berkshire, England, UK. July.

Nigel Cattlin / Rose rust (Phragmidium mucronatum) lesions and chlorosis on ornamental Rose (Rosa sp) leaf. Berkshire, England, UK. July.

Will Watson / Nettle clustercup rust fungus (Puccinia urticata) induced gall on Common nettle (Urtica dioica), Westhope Common, Herefordshire, England, UK, May.

Alex Hyde / Violet bramble rust (Phragmidium violaceum) causing red colouration on Bramble leaf (Rubus fruticosus aggregate). Peak District National Park, Derbyshire, UK. October.

Alex Hyde / Violet bramble rust (Phragmidium violaceum) causing red colouration on Bramble leaf (Rubus fruticosus aggregate). Peak District National Park, Derbyshire, UK. October.

Chris Mattison / Butterbur rust (Coleosporium petasites) Derbyshire, England, UK, August.

Pal Hermansen / Fly agaric (Amanita muscaria) growing in car graveyard, Bastns, Sweden, September.

Adrian Davies / Willow (Salix) leaf, with Willow leaf rust (Melampsora) Surrey, England, June.

Adrian Davies / Willow (Salix) leaf, with Willow leaf rust (Melampsora) Surrey, England, 2014.

David Woodfall / Botanist using eye piece to identify Black Stem Rust, a fungus species which threatens future of world wheat crops. Radnorshire, Wales, UK, June.

Colin Monteath / Abandoned car covered in lichen and rust, Canterbury, New Zealand

Colin Monteath / Abandoned car covered in lichen and rust, Canterbury, New Zealand

Adrian Davies / Burnet rose (Rosa pimpinellifolia) hip infected with Rust fungus (Phragmidium tuberculatum) The Burren, County Clare, Republic of Ireland

Adrian Davies / Rose stem (Rosa sp) infected with Rose rust fungus (Phragmidium tuberculatum)

Nigel Cattlin / Leek rust (Puccinia allii / porri), fungal disease infection and orange pustules on leaves of leek, May Berkshire, England, UK. May.

Nigel Cattlin / Leek rust (Puccinia allii / porri), fungal disease infection and orange pustules on leaves of leek, May Berkshire, England, UK. May.

Nigel Cattlin / Leek rust (Puccinia allii / porri), fungal disease infection and orange pustules on leaves of leek, May Berkshire, England, UK. May.

Nigel Cattlin / Arum / Ramson's rust (Puccinia sessilis) pustules and lesions on leaves of wild arum, lords and ladies (Arum maculatum) Berkshire, England, UK.

Nigel Cattlin / Arum / Ramson's rust (Puccinia sessilis) pustules and lesions on leaves of wild arum, lords and ladies (Arum maculatum) Berkshire, England, UK.

Nigel Cattlin / Plum rust (Tranzschelia pruni-spinosae var. discolor) pustules on the underside of a Victoria plum leaf Berkshire, England, UK.

Nigel Cattlin / Plum rust (Tranzschelia pruni-spinosae var. discolor) necrotic mottling spots of a Victoria plum leaf upper surface Berkshire, England, UK.

Nigel Cattlin / Crown rust (Puccinia coronata) leaf infection on meadow-grass (Poa sp.)

Adrian Davies / Rust fungus (Puccinia lagenophorae) growing on Groundsel (Senecio vulgaris) on black background, Surrey, UK. August.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves and petioles and stems of hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustule swelling on the stem and spike of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules lesion and aecial horns forming on upper leaf of Hawthorn (Crataegus monogyna), Berkshhire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on flower and peduncle of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Nigel Cattlin / Hawthorn juniper rust (Gymnosporangium sp.) rust pustules, aecial horns and swellings on leaves, petioles and stems of Hawthorn (Crataegus monogyna), Berkshire, UK. May.

Doug Wechsler / Juniper-apple rust (Gymnosporangium juniperi-virginianae) on Virginian juniper (Juniperus virginiana) tree, Morris Arboretum, Pennsylvania, USA. May.

Nick Upton / Burnet rose (Rosa pimpinellifolia) covered with Rust fungus (Phragmidium rosae-pimpinellifoliae), on sand dunes, Kenfig National Nature Reserve, Glamorgan, Wales, UK, June.

Nigel Cattlin / Brown rust (Puccinia recondita f.sp. tritici) pustules on flag leaves and ears of unripe Wheat (Triticum aestivum) crop, England, UK. July.

Nigel Cattlin / Yellow rust / Wheat stripe rust (Puccinia striiformis f.sp. tritici) sporulating pustules on a Wheat (Triticum aestivum) leaf, close up.

Nigel Cattlin / Pustules of Barley brown rust (Puccinia hordei) causing small chlorotic lesions on the underside of barley flag leaves.

Nigel Cattlin / Yellow rust / Stripe rust (Puccinia striiformis var. strriformis) fungal disease infection with lines of pustules on flag leaves of Wheat (Triticum aestivum) crop.

Nigel Cattlin / European pear rust (Gymnosporangium sabinae) growth blister producing aeciospores on the lower surface of a pear leaf, Berkshire, UK, September.

Nigel Cattlin / European pear rust (Gymnosporangium sabinae) lesions on the upper surface of a pear leaf, Berkshire, UK, September.

Nigel Cattlin / Plum rust (Tranzschelia pruni-spinosae var. discolor) yellow spot lesions on the upper surface of a Victoria plum (Prunus domestica) leaf, Berkshire, UK, August.

Nigel Cattlin / Asian soybean rust (Phakopsora pachyrizi) pustules on the under surface of a soybean leaf, Thailand

Nigel Cattlin / Asian soybean rust (Phakopsora pachyrizi) pustules on the under surface of a soybean leaf, Thailand

Nigel Cattlin / Photomicrograph of yellow rust or stripe rust (Puccinia striiformis var. striiformis) sorulating pustules along the veins of a wheat leaf

Nigel Cattlin / Sugar beet rust (Uromyces beticola) fungal disease pustules on a sugar beet leaf, Champagne Region, France

Nigel Cattlin / Sugar beet rust (Uromyces beticola) fungal disease pustules on a sugar beet leaf, Champagne Region, France

Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September

Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) lesions on the upper leaf surface of an apple leaf, New York, USA, September

Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) pustules on the underside of an apple leaf, New York, USA, September

Nigel Cattlin / Cedar apple rust (Gymnosporangium juniperi-virginianae) lesions on the upper leaf surface of an apple leaf, New York, USA, September

Nigel Cattlin / Corn, maize or sorghum rust (Puccinia sorghi) fungus disease pustules on maize or corn leaf, Illinois, USA

Nigel Cattlin / Powdery mildew (Blumeria graminis) mycelium and cleistothecia and brown leaf rust (Puccinia triticina) pustules on a wheat leaf

Nigel Cattlin / Brown or leaf rust (Puccinia triticina) infection on flag leaves and ears of a wheat crop in green unripe ears

Nigel Cattlin / Photomicrograph of wheat leaf or brown rust (Puccinia triticina) sporulating pustules and spores with powdery mildew on a wheat leaf

Nigel Cattlin / Wheat leaf rust or brown rust (Puccinia triticina) infection on the flagleaves and crop of a winter wheat in ear

Nigel Cattlin / Wheat leaf rust or brown rust (Puccinia triticina) infection on the flagleaves and crop of a winter wheat in ear

Nigel Cattlin / Brown rust (Puccinia hordei) pustules of infection on barley flag leaf from crop plant in ear

Nigel Cattlin / Carnation rust (Uromyces dianthi) pustules erupting on Dianthus spp. leaf base and stem, Italy

Nigel Cattlin / Mallow rust (Puccinia malvacearum) necrotic lesions on the upper surface of a common mallow (Malva neglecta) leaf, Berkshire, England, UK, June

Nigel Cattlin / Mallow rust (Puccinia malvacearum) disease pustules on the lower surface of a common mallow (Malva neglecta) leaf, Berkshire, England, UK, June

Nigel Cattlin / Mallow rust (Puccinia malvacearum) disease pustules on the lower surface of a common mallow (Malva neglecta) leaf, Berkshire, England, UK, June

Nigel Cattlin / Mallow rust (Puccinia malvacearum) necrotic lesions on the upper surface of a common mallow (Malva neglecta) leaf, Berkshire, England, UK, June

Nigel Cattlin / Garlic or leek rust (Puccinia allii) fungal disease pustules on garlic leaves and stem, Berkshire, England, UK, June

Nigel Cattlin / Garlic or leek rust (Puccinia allii) fungal disease pustules on garlic leaves and stem, Berkshire, England, UK, June

Nigel Cattlin / Blackberry rust (Kuehneola uredinis) lesions and orange spores on the underside of a Bramble (Rubus fructicosus) leaf, Berkshire, England, UK, May

Nigel Cattlin / Blackberry rust (Kuehneola uredinis) lesions and orange spores on the underside of a Bramble (Rubus fructicosus) leaf, Berkshire, England, UK, May

Nigel Cattlin / Blackberry rust (Kuehneola uredinis) lesions and orange spores on the stem of Bramble(Rubus fructicosus), Berkshire, England, UK, May

Nigel Cattlin / Blackberry rust (Kuehneola uredinis) lesions and orange spores on the stem of Bramble (Rubus fructicosus), Berkshire, England, UK, May

Claudio Contreras / Coffee leaf rust (Hemileya vastatrix), Finca Nueva Linda, El Triunfo Biosphere Reserve, Chiapas, southern Mexico, April

Nigel Cattlin / Poplar rust (Melampsora sp) disease pustules on underside of White poplar (Populus alba) leaf.

Nigel Cattlin / Plum rust (Tranzschelia discolor) fungal disease pustules on underside of Plum (Prunus domestica) leaf.

Nigel Cattlin / Pear rust (Gymnosporangium fuscum) pustules and damage on underside of Pear (Pyrus communis) leaves. Berkshire, England, UK. September.

Nigel Cattlin / Pear rust (Gymnosporangium fuscum) pustules and damage on underside of Pear (Pyrus communis) leaves. Berkshire, England, UK. September.

Nigel Cattlin / Pear rust (Gymnosporangium fuscum) pustules and damage on upper and lower surfaces of Pear (Pyrus communis) leaves. Berkshire, England, UK. September.

Nigel Cattlin / Mint rust (Puccinia menthae) pustules on Peppermint (Mentha x piperata) leaf. Devon, England, UK.

Nigel Cattlin / Broad bean (Vicia faba) leaf with early infection of Faba-bean rust caused by Fungus (Uromyces viciae-fabae).

Nigel Cattlin / Necrotic spots caused by coffee rust (Hemileia vastatrix) to the upper surface of a coffee (Coffee arabica) leaf, Malaysia, February

Linda Pitkin / Violet Bramble Rust (Phragmidium violaceum), Bookham Common, Surrey, England, September.

Nigel Cattlin / White rust (Wilsoniana bliti) blisters on the upper surface of amaranth / pigweed leaves (Amaranthus retroflexus), Berkshire, England, UK. July

Nigel Cattlin / White rust (Wilsoniana bliti) blisters on the upper surface of amaranth / pigweed leaves (Amaranthus retroflexus), Berkshire, July

Nigel Cattlin / Hollyhock rust (Puccinia malvacearum) early spotting symptoms on the top surface of a hollyhock leaf, Berkshire, July

Nigel Cattlin / Oat crown rust (Puccinia coronata) orange pustules on Oat flag leaf of a plant in ear, Devon, July,

Nigel Cattlin / Oat crown rust (Puccinia coronata) orange pustules on Oat's flag leaf of a plant in ear, Devon, July,

Nigel Cattlin / A photomicrograph of Oat crown rust (Puccinia coronata) pustules on an Oat leaf, Devon, August

Nigel Cattlin / Box rust (Puccinia buxi) pustules on the upper surface of a diseased parterre box hedge leaves, Devon, England, UK, May

Nigel Cattlin / Box rust (Puccinia buxi) pustules on the lower surface of a diseased parterre box hedge leaves, Devon, England, UK, May