08/18/2026
TO***CO BUDWORM
Are you seeing holes in your flowers, tiny eggs on the leaves or black specs on the stems?
These are characteristic symptoms indicating the presence of the To***co Budworm. The larvae attack several ornamental flowers including petunia, rose, geranium, and nicotiana. They feed primarily on buds, petals, and developing seed pods, but will feed on shoot tips and foliage if flower buds are not available.
On most hosts, larvae prefer to tunnel into buds, but they will also feed on the petals of opened flowers (especially on petunia). Damaged buds fail to open, resulting in loss of color in floral plantings. If buds open, flowers and leaves appear ragged or tattered.
The adult is a greenish-brown moth with cream-colored bands on the wings. It is about 3/4 inch long with a wingspan of about 1 1/2 inches. Eggs are laid on blossoms, fruit, or shoot tips of plants. Very young larvae are yellowish or light-yellow green, but the color of older larvae is variable.
NON-CHEMICAL MANAGEMENT
-Avoid use of broad-spectrum insecticides which kill natural predators of garden pests.
-Consider planting less-susceptible plants. For instance, ivy geranium is reported to be damaged less frequently than standard horticultural geraniums.
-Monitor plants closely for damage. Handpick and destroy larvae and infested buds on roses, petunias, and geraniums.
-Scout for larvae at dusk, when they are most active. Check for actively-feeding larvae, small holes in buds and flowers, and caterpillar droppings (frass or f***s) associated with damaged buds.
https://extension.colostate.edu/resource/tobacco-geranium-budworm/
Image of caterpillar via Wikimedia commons