Answer: Sounds like your tulips have Rembrandt Virus, also known as Tulip Breaking Virus (TBV). This virus has an interesting history as it was purposefully introduced to tulips in the past to produce new color varieties and variations. Now, this practice is frowned upon and is only performed by "rogue" tulip growers. It is possible that only one tulip in an entire bed can be affected, or, the entire bed can be affected. A tulip with this virus is called "broken". Once a tulip is broken, it is always broken. It will never regain its original color. Any offsets of that tulip will also be broken. This virus is spread by aphids, so it affects later blooming tulip varieties most. To prevent further spread of the virus, control the aphids. If the broken tulips are unattractive, you will need to dig them up and throw them out. If they are still appealing to you , simply leave them be - you can't treat the virus.
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