|Basal Rot||Large spots on bulbs are dark brown. White or pink fungal growth forms on the bulbs. Flowers from infected bulbs are deformed. Foliage dies prematurely.||Fusarium oxysporum f. sp. tulipae||Do not plant bulbs that have white or pink fungus on them. Purchase and plant fungicide-treated bulbs.|
|Fire||Leaves may fail to emerge or may be stunted or deformed. The shoots may curl to one side. Dead spots are surrounded by dark green. Spots turn white or yellow and have small black granules (sclerotia) in them.||Botrytis tulipae||Purchase fungicide-treated bulbs. Apply a fungicide to protect plants.|
|Pythium Root Rot
||Bulbs have soft, gray spots with brown borders at the base of the bulb. Shoots fail to emerge.||Pythium||Plant in chemically or steam-pasteurized potting mix. Discard infected plants.|
|Stem and Bulb Nematode
||Bulbs have gray to brown patches that feel spongy. Bulbs feel lighter than normal at planting and the interior of the bulb is mealy in texture.||Ditylenchus dipsaci||Purchase and plant hot water treated bulbs. Discard infected bulbs.|
|Viruses||Leaves may be mottled, have yellow flecks or stripes. Flower color may break or flowers may be distorted.||Many viruses are known including tulip breaking, tobacco necrosis, tobacco rattle, tobacco mosaic, and cucumber mosaic virus.||Discard infected plants. Purchase virus-free plants.|
Notice: The user of this information assumes all risks for personal injury or property damage.
Warning! Pesticides are poisonous. Read and follow all directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams or ponds.
Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
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