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NMSU Onion Publications

Onion Extension Presentations and Posters

Presentations

  • [Onion and Curcurbit Diseases]
  • [Onion Diseases]

Posters

Onion Diseases caused by Viruses

Iris Yellow Spot Virus on Onions
Iris Yellow Spot Virus on onions (Photo: Natalie Goldberg, NMSU)

Disease: Iris Yellow Spot

Pathogen: Iris Yellow Spot Virus

Vector: Onion Thrips (Thrips tabaci)

Host: Onions, garlic, leeks, lisianthus, iris, weeds (redroot pigweed, jimsonweed, tobacco)

Iris Yellow Spot Virus Publication

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Onion Diseases caused by Bacteria

Image of bacterial soft rot on onion
Bacterial soft rot of onion (Photo: Howard F. Schwartz, Colorado State University, Bugwood.org)

Disease: Bacterial soft rot

Pathogen: Pectobasidium carotovorum subsp. carotovorum (= Erwinia carotovora subsp. carotovora)

Hosts: Onions and many other vegetables and fruit

Image of slippery skin on onions
Slippery skin on onions

Disease: Slippery Skin

Pathogen: Burkholderia gladioli pv. alliicola (=Pseudomonas gladioli pv. alliicola)

Host: Onions and gladiolus

Image of sour skin on onions
Sour skin on onions

Disease: Sour Skin

Pathogen: Burkholderia cepacia (=Pseudomonas cepacia)

Hosts: Onions and other Allium spp.

Onion Diseases caused by Fungi

Image of black mold on onions
Black mold on onions (Photo: New Mexico State University)

Disease: Black Mold

Pathogen: Aspergillus niger

Host: Onions, garlic and many other plants including peanuts, apples, tomatoes, beans and corn

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Image of Botrytis on onions
Botrytis on onions (Photo: Howard F. Schwartz, Colorado State University, Bugwood.org)

Disease: Botrytis neck rot, Botrytis bulb rot

Pathogen: Botrytis allii, Botrytis squamosa, Botrytis cinerea, and other Botrytis spp.

Hosts: Onions and many other plants

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Image of Fusarium basal rot on onion
Fusarium basal rot on onions (Howard F. Schwartz, Colorado State University, Bugwood.org)

Disease: Fusarium basal rot

Pathogen: Fusarium oxysporum fsp. cepa

Host: Onions

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Image of pink root on onions
Pink root on onions (Photo: Natalie Goldberg, NMSU)

Disease: Pink root

Pathogen: Phoma terrestris (= Pyrenochaeta terresris)

Host: Onions and many other plants

Pink Root Fact Sheet

Image of powdery mildew on onions
Powdery mildew on onions (Photo: Natalie Goldberg, NMSU)

Disease: Powdery mildew

Pathogen: Oidiopsis taurica (= Leveillula taurica)

Host: Onions and many other plants

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Image of purple blotch on onions
Purple blotch on onions (Photo: Howard F. Schwartz, Colorado State University)

Disease: Purple Blotch

Pathogen: Alternaria porri

Host: Onions, garlic, Egyptian onion, Welsh onion, leeks and other Allium species

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Onion Diseases caused by Nematodes

Image of root knot nematode on onions
Root knot nematode on onions (Photo: Steve Thomas, New Mexico State University)

Disease: Root Knot Nematode

Pathogen: Meloidogyne incognita and other Meloidogyne spp.

Host: Onions and many other plants

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