Yes, praying mantises do eat ladybugs. Mantises are generalist predators that consume virtually any insect they can catch, and ladybugs are no exception. While ladybugs have some natural defenses, including a hard shell and bitter-tasting chemicals, these aren’t enough to reliably deter a hungry mantis.
How Mantises Handle Ladybug Defenses
Ladybugs aren’t easy prey for every predator. Their bright red-and-black coloring warns birds and other animals that they taste bad, and their hard wing covers (called elytra) act as a physical shield. But praying mantises don’t rely on taste to choose their meals the way birds do. They’re ambush hunters that strike at anything the right size that moves within reach.
Mantises have powerful mouthparts built to chew through tough exoskeletons. Studies on mantises eating beetles show they typically consume about 90% of the body, focusing on the soft, nutrient-rich thorax and abdomen. They leave behind the hardest parts: the wing covers, legs, and antennae. A ladybug, being smaller than many beetles, presents even less of a challenge. Once a mantis grabs a ladybug with its spiked forelegs, the ladybug’s shell offers limited protection against those strong jaws.
Why Mantises Don’t Pick Favorites
The key thing to understand about praying mantises is that they are completely indiscriminate predators. They don’t distinguish between pest insects and beneficial ones. A mantis will just as happily eat an aphid-destroying ladybug as it will eat an aphid. This extends to butterflies, bees, spiders, and even other mantises. Oregon State University’s pest management resources put it plainly: mantises “consume all insects they catch, including other beneficial insects.”
This makes mantises unusual among garden predators. Ladybugs specialize in soft-bodied pests like aphids. Parasitic wasps target specific caterpillars or beetle larvae. But mantises have no specialty. They sit, wait, and grab whatever comes close enough.
What This Means for Your Garden
If you’re thinking about releasing both praying mantises and ladybugs in your garden for pest control, expect the mantises to thin out your ladybug population. This is a real trade-off. Ladybugs are among the most effective natural predators of aphids, with a single ladybug eating dozens of aphids per day. Losing ladybugs to mantis predation can actually reduce your overall pest control rather than improve it.
Mantises also reproduce slowly and wander away from where they’re released, so they’re unreliable as targeted pest control. A mantis might spend its afternoon catching a pollinator instead of the garden pest you wanted gone. For focused aphid control, ladybugs or lacewings are far more efficient choices on their own.
If you already have a wild mantis living in your garden, there’s no practical way to stop it from eating ladybugs. But deliberately releasing both at the same time works against your own goals. Choose one strategy or the other. If aphids are your main problem, ladybugs alone will do more good than adding mantises to the mix.
How Often It Actually Happens
In practice, mantises eating ladybugs isn’t an everyday event in most gardens. Mantises are solitary and relatively rare compared to ladybug populations, and they only eat one or two insects a day depending on their size. A single mantis won’t wipe out a healthy ladybug population. The concern is more relevant when people buy and release mantis egg cases, which can hatch 100 to 200 nymphs at once. Young mantises are voracious and will eat any small insect around them, including ladybug larvae, which lack the hard shell adults have.
Wild mantises and wild ladybugs coexist in the same habitats without one eliminating the other. The issue only becomes a real problem when you’re artificially concentrating both species in a small garden space and expecting them to cooperate on pest duty. They won’t. The mantis sees the ladybug as lunch, not as a coworker.