Photo By garyg , used under CC-BY-NC-ND 4.0 /Cropped and compressed from original
Cobalt milkweed beetle
Chrysochus cobaltinus
A species of Chrysochus, Also known as Chrysochus_cobaltinus
The cobalt milkweed beetle (Chrysochus cobaltinus) is named from the beautiful cobalt-blue color that covers its body. Females will lay their eggs on the bottom of milkweed leaves, which is where it gets the other half of the name. In some cases, the larva can skeletonize the plant, which causes its growth to stagnate. In the worst-case scenario, it can even destroy the root systems of the milkweed.
General Info About Cobalt milkweed beetle
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Attributes of Cobalt milkweed beetle
Biting/stinging
Not reported
Allergy-causing
Not reported
Defensive attack
Not reported
Venomous
Not reported
Non-poisonous
The Cobalt milkweed beetle is non-toxic and generally doesn't pose a risk to human health. No need for excessive worry.
Borer
Not reported
Pollinator
The Cobalt milkweed beetle is often found near the corolla, where its fluffy hairs easily pick up pollen, assisting in the pollination of the plant.
Pest-Eating Predatory
Not reported
Phytophagous
The Cobalt milkweed beetle feeds on plants, usually without causing significant harm. However, it's important to take the situation seriously if their numbers begin to increase significantly.
Predatory
Not reported
Biting animal or pet
Not reported
Mouthparts Type
Chewing mouthparts
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Appearance of Cobalt milkweed beetle
Chrysochus cobaltinus has an iridescent cobalt-blue exoskeleton. Both sexes range from 6 - 9 mm in length, with clubbed antenna. The body is oval, although the ventral is not prominently convex.
Egg The eggs of cobalt milkweed beetle are typically oval and may vary in color but are often white or pale. They serve as the protective enclosure for the developing insect and are usually laid in clusters.
Larva Larvae of cobalt milkweed beetle emerge from eggs, resembling small, segmented worms with a distinct head and chewing mouthparts, specialized for feeding voraciously on host plants.
Pupal During the pupal stage, cobalt milkweed beetle undergoes a complete transformation within a protective case, transitioning from larva to adult. The creature inside is largely immobile and vulnerable.
Adult Emerging from the pupa, the adult cobalt milkweed beetle’s development is marked by the presence of wings and functional reproductive organs. The body is fully formed and hardened, and the adult is mobile, focusing on reproduction.
Adult Size of Cobalt milkweed beetle
6 - 9 mm
Predators of Cobalt milkweed beetle Larvae
Birds, small mammals, reptiles, amphibians, spiders, predatory insects
Predators of Adult Cobalt milkweed beetle
Birds, rodents, small mammals, reptiles, spiders, predatory insects
Interesting Facts About Cobalt milkweed beetle
Cobalt milkweed beetle can emit a squeaking sound when threatened, produced by the friction of its body parts, a behavior known as stridulation.
Scientific Classification of Cobalt milkweed beetle
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How Can You Attract Cobalt milkweed beetle
Since cobalt milkweed beetle is known to feed on specific plants, using these as a lure in a trap would be an effective attractant.
Habitat Preferences of Cobalt milkweed beetle Through Different Life Stages
Adult cobalt milkweed beetle are typically found on leaves of milkweed or dogbane during late spring to early fall in various locales across the U.S., such as the eastern states and the Midwest. The larvae prefer the undersides of these host plants' leaves, where they can discretely feed and develop. If searching for them, one should inspect the mentioned plant species in areas such as meadows, fields, and along roadsides. Checking these leaf surfaces and turning them over gently during the appropriate season increases the chances of encountering various stages in their life cycle.
When is the Best Time to Observe Cobalt milkweed beetle
The ideal time to find cobalt milkweed beetle is when they are most active, which is typically during the day, especially in the late morning and early afternoon when temperatures are warmer.
What is the Best Weather to Observe Cobalt milkweed beetle
Mild, sunny weather with low wind is generally best for finding cobalt milkweed beetle as they are more likely to be active and visible on the host plants they feed upon.
How and Where Can You Find Cobalt milkweed beetle at Different Life Stages
Egg Cobalt milkweed beetle eggs are typically laid on the underside of host plant leaves. To find them, inspect these plants, looking closely for small clusters of eggs.
Larva Larval cobalt milkweed beetle are found on or near their host plants. Search the leaves and stems of these plants for the larvae, which may be feeding and are usually more noticeable than the eggs.
Pupal Pupae of cobalt milkweed beetle often form on or in the soil near their host plants. To locate them, scout around the base of these plants, checking for pupae among leaf litter or just beneath the soil surface.
Adult Adult cobalt milkweed beetle are typically found on their host plants. The best way to find them is by directly observing the plants during the day, as adults are likely to be feeding on leaves or mating.
Are Cobalt milkweed beetle harmful?
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Usually, the cobalt milkweed beetle won't threaten or hurt humans. But remember that even a worm will turn. Remember to still be cautious.
Are Cobalt milkweed beetle harmful to humans?
Some colorful leaf beetles are actually toxic, and their beautiful appearance is warning predators: I am very dangerous, do not eat me! However, just observing with your eyes and touching the leaf beetle with your hand will not be poisoned.
Harmful Effects of Cobalt milkweed beetle
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Hurt Plant
The cobalt milkweed beetle inflicts damage on host plants through feeding on the leaves, specifically by chewing plant tissues. This results in visible marks and defoliation, which can disrupt the plant's ability to photosynthesize, ultimately leading to reduced plant vigor and growth.
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Pollinator
Pollinator
Attract Plant Feature
Color, Smell
Pollination Behavior Reason
Eat Pollen Or Nectar
Cobalt milkweed beetle is drawn to the vivid colors and alluring scents of flowering Asteraceae. It's a mutualistic relationship, where cobalt milkweed beetle consumes pollen while inadvertently transferring it from one flower to another, aiding in plant reproduction.
Common Questions People Also Ask
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