Images
© Courtesy EcoPort (http://www.ecoport.org): Pankaj Oudhia
Onion Allium cepa
© Courtesy EcoPort (http://www.ecoport.org): MEDIMPEX, Hungary.
Onion (Allium Cepa), a drawing of the whole plant,flower and bulb.
© A.A.Seif, icipe
Onion nursery
© A.M. Varela, icipe
Rust on onion
© A. M. Varela, icipe
Purple blotch on onion. Leaf-tip dieback is a typical symptom of infection by Alternaria porri on onion.
© A. M. Varela, icipe
Thrips damage on onions. Note silvering and blotching of leaves.
© A. M. Varela, icipe
Close-up of advanced purple blotch spot.
© David B. Langston, University of Georgia, Bugwood.org
Fusarium basal rot on onions
© Whitney Cranshaw (www.ecoport.org)
Thrips symptoms on onion - typical silvering and blotching of leaves.
© Denis Persley and Tony Cooke, Department of Primary Industries and Fisheries, Queensland, Australia (Courtesy of EcoPort, www.ecoport.org)
Onion smudge. Small, round, dark blotches develop on bulbs, with a zonate pattern on the outer scale leaves.
© Judith K. Brown. Reproduced from the Crop Protection Compedium, 2004 Edition. © CAB International, Wallingford, UK, 2004.
Downy mildew advanced symptoms on onion plant
© David B. Langston, University of Georgia, Bugwood.org
Sour skin of onion.