| Disease |
Symptoms |
Pathogen/Cause |
Management |
| 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 chlorothalonil
to protect healthy 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. |
| Stem and Bulb Nematode |
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. |
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