Nigel Cattlin / Symptoms of Neck blast (Magnaporthe grisea) on Rice (Oryza sativa) plants in ear, Luzon, Philippines

Nigel Cattlin / Iron deficiency symptoms with interveinal chlorosis on cultivated Bougainvillea (Bougainvillea sp) leaves.

Nigel Cattlin / Iron deficiency symptoms with interveinal chlorosis on cultivated Bougainvillea (Bougainvillea sp) leaves.

Nigel Cattlin / Bird cherry-oat aphid (Rhopalosiphum padi) infestation on Wheat (Triticum aestivum) leaf with Barley yellow dwarf virus (BYDV) symptoms present.

Will Watson / Epicormic growths (shoots from bud beneath the bark) on Pedunculate Oak (Quercus robur) symptoms of chronic oak decline, Herefordshire, England, UK, April.

Dave Bevan / Rhododendron (Rhododendron sp.) flower spikes showing symptoms of Sudden Oak Death (Phytophthora kernoviae), a fungus-like pathogen.

Dave Bevan / Rhododendron (Rhododendron sp.) leaves showing symptoms of Sudden Oak Death (Phytophthora kernoviae) a fungus-like pathogen.

Nigel Cattlin / Symptoms of Neck blast (Magnaporthe grisea) on Rice (Oryza sativa) plants in ear, Luzon, Philippines

Nigel Cattlin / Symptoms of Neck blast (Magnaporthe grisea) on Rice (Oryza sativa) plants in ear, Luzon, Philippines

Nigel Cattlin / Early symptoms of False smut (Ustilaginoidea virens) on Rice (Oryza sativa) ears , Philippines.

Nigel Cattlin / Esca disease (Apoplexy) symptoms caused by several fungal pathogens and affecting the stem and fruit of grapevines, Thessaloniki, Greece, Europe.

Nigel Cattlin / Esca disease (Apoplexy) symptoms caused by several fungal pathogens and affecting the stem and fruit of grapevines, Thessaloniki, Greece, Europe.

Nigel Cattlin / Heart rot (Phytophthora nicotianae var. parasitica) yellowing discolouration symptoms and dead growing point in young Pineapple (Ananas comosus) plant, South Africa.

Nigel Cattlin / Symptoms of Foot rot (Fusarium solani f.sp. viciae) on Field bean (Vicia faba) stem bases.

Nigel Cattlin / Symptoms of Foot rot (Fusarium solani f.sp. viciae) on Field bean (Vicia faba) stem bases.

Nigel Cattlin / Downy mildew (Peronosclerospora sorghi) infection symptoms on the upper leaves of Maize / Corn (Zea mays) plant, USA.

Nigel Cattlin / Grapevine leaf roll virus symptoms on Pinot Noir grape leaves

Nigel Cattlin / Leafroll disease, grape leafroll asssociated viruses symptoms on Pinot Noir grape leaves , Champagne, France

Nigel Cattlin / Mottling and reticulation of an apple leaf caused by apple mosaic virus (AMV)

Nigel Cattlin / Interveinal chlorosis a symptom of manganese deficiency on an apple leaf

Nigel Cattlin / Barley leaf stripe (Pyrenophora graminea) characteristic symptoms on the leaves of a maturing barley crop

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 / Powdery mildew (Erysiphe betae) fungal disease on the leaf of sugar beet, Champagne region, France, September

Nigel Cattlin / Interveinal chlorosis and necrosis symptoms of magnesium (Mg) deficiency on the leaves of a Chardonnay grapevine, Champagne Region, France

Nigel Cattlin / Magnesium deficiency symptoms, reddening of leaves on Pinot Noir wine grapes in fruit, Champagne Region, France

Nigel Cattlin / Interveinal leaf necrosis caused by manganese (Mn) deficiency in Pinot Noir grapes in the Champagne Region of France

Nigel Cattlin / Necrotic lesions and damage on the margin of a Pinot Noir grapevine leaf caused by manganese deficiency, Champagne, France

Nigel Cattlin / Apple scab (Venturia inaequalis) infection spots germinated from a spore shower on an apple leaf, New York, USA,

Nigel Cattlin / Late leaf spot (Mycosphaerella berkleyi) symptoms on a peanut crop, North Carolina, USA, May

Nigel Cattlin / Late leaf spot (Mycosphaerella berkleyi) symptoms on a peanut leaf upper surface, North Carolina, USA, May

Nigel Cattlin / Early leaf spot (Cercospora arachidicola) fungal disease necrotic lesions on a peanut leaflet, North Carolina, USA

Nigel Cattlin / Sugar beet virus yellows (BYV) chlorosis symptoms on a sugar beet leaf in a maturing crop, Greece

Nigel Cattlin / Needle cast (Rhabdocline pseudotsugae) discolouration and symptoms of infection on douglas fir needles

Nigel Cattlin / Barley (Hordeum vulgare) leaves diseased with chlorotic symptoms of Barley yellow mosaic virus (BaYMV).

Nigel Cattlin / Rhizomania root disease on Sugar beet (Beta vulgaris) leaves, caused by Beet necrotic yellow vein virus (BNYVV). Greece.

Nigel Cattlin / Wheat ear showing copper deficiency symptoms with ear trapped by twisted flagleaf

Nigel Cattlin / Chocolate spot (Botrytis fabae) early symptoms of discreet necrotic loesions on the leaf of a field bean (Vicia faba)

Nigel Cattlin / Wheat ear showing copper deficiency symptoms with ear trapped by twisted flagleaf

Nigel Cattlin / Wheat ear showing copper deficiency symptoms with ear trapped by twisted flagleaf

Nigel Cattlin / Focus of infection of BYDV (barley yellow dwarf virus) with chlorosis and leaf tipping symptoms in maturing wheat crop in ear. England, UK.

Nigel Cattlin / Severe symptoms, chlorosis and necrosis, caused by magnesium deficiency on the edge of an oilseed rape leaf

Nigel Cattlin / Focus of infection of barley yellow dwarf virus (BYDV), red leaf damage symptoms on young oats crop, Hampshire, England, UK.

Nigel Cattlin / Focus of infection of barley yellow dwarf virus (BYDV), red leaf damage symptoms on young oat crop, Hampshire, England, UK.

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

Nigel Cattlin / Lime induced iron deficiency symptoms on the new leaves of a Hydrangea (Hydrangea macrophylla) garden shrub, Berkshire, June

Nigel Cattlin / Symptoms of magnesium deficiency on grapevines in fruit in Gironde, France, August

Nigel Cattlin / Symptoms of magnesium deficiency on grapevines in fruit in Gironde, France, August

Nigel Cattlin / Twisted flag leaf a symptom of copper deficiency in a wheat crop and a lack of nutrient minerals in the soil

Nigel Cattlin / Blossom end rot, calcium deficiency symptoms on a glasshouse grown tomato fruit var. Roma, Berkshire, England, UK, September

Nigel Cattlin / Blossom end rot, calcium deficiency symptoms on a glasshouse grown tomato fruit var. Roma, Berkshire, England, UK, July

Nigel Cattlin / Blossom end rot, calcium deficiency symptoms on a glasshouse grown tomato fruit var. Roma, Berkshire, England, UK, July

Nigel Cattlin / Dark veins and yellow interveinal chlorosis, a symptoms of iron deficiency on ornamental garden rose leaves, Berkshire, England, UK, August

Nigel Cattlin / Yellow leaf striping, chlorosis symptoms of magnesium deficiency in a maize, corn crop in mature cob