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All crops

Insects

Onion Thrips (Thrips tabaci)

Diseases

Iris Yellow Spot Virus (Tospovirus spp.) Neck Rot (Botrytis spp.) Pink Root of Onion (Phoma terrestris)
Powdery Mildew (Leveillula taurica)

Image Attribution

Iris Yellow Spot Virus:Howard F. Schwartz, Colorado State University, Bugwood.org
Neck Rot & Pink Root of Onion:Howard F. Schwartz, Colorado State University, Bugwood.org
Powdery Mildew:S. K. Mohan, Bugwood.org