Amaryllis Leaf Problem

Fungal Infection

• Amaryllis is susceptible to leaf scorch or red fire disease caused by Stagonospora curtsii. The disease affects all plant areas including foliage. Plant growth is deformed at infection sites and red spots appear on the affected area. Fungus is usually present in the bulb prior to planting. Discard infected bulbs and obtain healthy stock from reliable sources. Grow flowers in well-lit areas with good air circulation.

Viral Infection

• Mosaic virus is among the common viral disorders of amaryllis. Affected leaves display pale yellow to white spots that eventually turn red with disease progression. Flowers are stunted in growth and foliage gradually dies. No cure exists for the disorder even though symptoms may subside temporarily. Remove and destroy infected plants to minimize spread of disease.

Pest Infestation

• Thrips are 1/16-inch-long black insects that damage all tender plant areas by feeding on plant sap or juice. Female thrips lay their eggs in the fine slits of foliage. Infested plants do not blossom. Foliage is discolored from feeding and grows poorly. Control thrips with recommended insecticides including spinosad, methoxychlor or carbaryl.