Caterpillars on Climbing Rose: Bt Is Your Organic Solution

Furry black caterpillars stripping your wild climbing rose? Bacillus thuringiensis (Bt)—a bacterial spray that kills only caterpillars. Safe for bees, birds, pets, and beneficials.

Action Plan

1. Buy Bt at any garden center (Dipel, Thuricide, etc.)
2. Spray thoroughly on foliage—caterpillars must ingest it.
3. Reapply after rain or weekly until gone.
4. Bring a sample in a sealed bag to the nursery for exact ID and product matching.

Why This Year?

Insect populations cycle like locusts. Your rose was simply on the menu this season. Bt breaks the cycle without collateral damage.