Sphinx Moths (also called Hawk Moths) are often mistaken for hummingbirds because of their size and flight patterns. However, their larval stage—the Hornworm—is a legendary foe for Utah gardeners.
The MothLarge, heavy-bodied moths with narrow wings. They are often gray or brown with intricate patterns that provide perfect camouflage against tree bark.
The "Hummingbird" FlightThey can hover in front of flowers and have a very long proboscis (tongue) to drink nectar, just like a bird.
The HornwormThe larvae are massive, bright green caterpillars with a "horn" on their rear end. The Tomato Hornworm is the most famous Utah variety.
Dusk ActivityMost Sphinx moths are active at twilight (crepuscular). They are vital pollinators for Utah's night-blooming flowers.
The Ravenous HornwormWhile the moth is beautiful, the caterpillar is a glutton. A single hornworm can strip a tomato or pepper plant of its leaves in less than 48 hours.
CamouflageDespite their bright green color, hornworms are incredibly hard to see because they align themselves with the stems of the plants they are eating.
Why does this 'hummingbird' have six legs and antennae?If it's hovering at dusk and looks a bit "fuzzy" and gray, it’s a Sphinx Moth! They are often called "Whitelined Sphinx Moths" in Utah.
Do the horns on the caterpillars sting?No. The "horn" is completely soft and harmless. It is a visual bluff meant to trick birds into thinking the caterpillar is dangerous.
How do I find hornworms on my tomatoes?Look for "frass" (large, black droppings) on the leaves. If you see the droppings, look directly above them—the caterpillar is usually hiding on the underside of the stem.
