If you suspect that your rose bushes are infested with rose thrips this page will help you identify the symptoms and also how to treat and control thrips on roses.
Thrips on roses are very tiny insects that use their mouth parts to feed on plant fluids.
They are especially damaging to rosebuds and flowers. Severe infestation will deform buds and cause the buds to fail to open into a flower.
You can see the damage as brownish streaks or spots on petals.
These insects are especially fond of pale colored roses.
Like aphids, they tend to multiply fast and can build large populations rapidly.
So be vigilant and take action right away.
Check your roses frequently (daily is best) during the season for any sign of rose thrips or other pests or diseases.
Thrips are most common during the early part of summer.
But they can also live in your garden year round, overwintering in the soil under host plants.
The worst problem with thrips is that they are almost invisible troublemakers.
Many beneficial insects feed on thrips, especially lacewings.
Before you wrestle with any insect problem, make sure you know what kind of pest you are dealing with.
The paragraph below will help you and be sure to read that information I give you there.
The best way to really be sure that you have a thrip infestation, is to take some damaged buds and flowers and shake them over a white piece of paper. Cut the buds open and then shake them.
You should be able to see (a magnifying glass is helpful) tiny yellow-brown flecks moving across the paper. This will confirm that you actually have thrips, so now is the time to take action.
Because thrips hide within buds and flower petals, they are hard to treat.
Prune off and destroy all infested buds and flowers right away.
LESS TOXIC TREATMENTS: Spray with insecticidal soap. Or spray with neem, rotenone, or pyrenthrum.
CHEMICAL TREATMENT: For severe infestations spray with Ortho's Thrip Control. If the problem is chronic each year, use a systemic insecticide that specifies thrip control right after pruning in early spring, and repeat during the season as directed.