This gives rise to the name ring disease and can be seen when bulbs are cut in half. Yellowish pockets in the scales contain many nematodes. Badly infested bulbs fail to grow in spring or they fail to develop flowers.
Infested leaves have small swellings of yellowish tissue.
Shoots may be abnormal and twisted. Destroy infested bulbs. No chemical control is listed. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.