To be sure, hold some of the Violet's flowers over a sheet of paper and give them a gentle thump. If Thrips are present, you will see some of them drop onto the paper. You may need a magnifying glass to correctly identify them. Other Symptoms Leaves darken on the edge . Leaves have white spots on them .
Flowers are blotchy or streaked .
Flowers turn brown or have brown spots on them . Flowers are damaged . They may have holes in them. Flowers are smaller than normal . Not flowering .