This article is from the Rose Gardening FAQ, by Bill Chandler chandler@austin.ibm.com, Jolene Adams jolene@cchem.berkeley.edu, Brent C. Dickerson odinthor@csulf.edu, Karen Baldwin kbaldwin@veribest.com, and many contributors
Thrips are tiny insects that do cosmetic damage to roses by ruining the
blooms. They may either prevent blooms from opening, or if the blooms do
partially open they will have brown or black spots. Thrips prefer
light-colored flowers. Thrips can be controlled by spraying the buds and
blooms with Orthene, mixed with one tablespoon of dark brown sugar per
gallon of water.
 
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