|Basal Rot||Plants are stunted and foliage dies prematurely. The few roots present are brown and the basal plate is decayed. White or pink fungal growth develops between the bulb scales.||Fusarium oxysporum f. sp. narcissii||Do not plant bulbs that have white or pink fungus on them. Purchase and plant hot water treated bulbs.|
|Fire||Flowers are spotted, turn brown, and die. Small, tan, oval spots form near leaf tips. Leaves have bright yellow streaking near tips.||Botryotinia polyblastis||Discard infected plants. Apply a fungicide to protect plants.|
|Lesion Nematode||Plants are stunted and the foliage dies prematurely.||Pratylenchus penetrans||Purchase and plant bulbs that were treated with hot water. Discard infected plants.|
|Scorch||Reddish-brown spots with yellow halos develop on leaf tips as they emerge. The spots enlarge, merge together, and the leaves die. Spots have small brown dots (fruiting structures) within them.||Stagnospora curtisii||Purchase and plant bulbs that have been hot water treated. Apply a fungicide to protect plants.|
|Stem and Bulb Nematodes||Leaves from infected bulbs are small, distorted, and sometimes swollen. Infected bulbs are rotted and feel lighter than normal at planting.||Ditylenchus dipsaci||Purchase and plant hot water-treated bulbs. Discard infected bulbs.|
|Viruses||Leaves may have a mosaic, have yellow to white stripes or have dead tips, and die prematurely.||Many viruses are known including white streak, narcissus tip necrosis, cucumber mosaic, yellow stripe, tobacco ringspot, and tomato ringspot.||Discard infected plants. Maintain good insect control.|
Rhizoctonia and nematodes affecting bulbs.
Prepared by Gary W. Moorman, Professor of Plant Pathology
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