Elena Rossi
The painted lady butterfly (Vanessa cardui) is the most widespread butterfly species in the world. It is found throughout Europe, Asia, Africa, North America, and Central America. The painted lady larvae, or caterpillars, undergo several instars of growth before pupation. Each instar represents a new stage of development, with the caterpillar growing larger and more mature. Painted lady larvae shed their exoskeletons five times during development, and each shed is known as an instar.
| Characteristics | Values |
|---|---|
| Number of Instars | 5 |
| Instar Duration | 5-10 days |
| Larval Stage Duration | 10-14 days |
| Larval Stage Food | Leaves of host plants |
| Larval Stage Habitat | Loosely woven silk nest |
| Larval Waste | Frass |
| Larval Webbing | For protection and attachment to host plants |
| Pre-Pupal Phase | Cease feeding and reduced activity |
| Pupation | On host plant |
| Pupa Appearance | Naked chrysalis |
| Pupa Duration | 7-10 days |
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What You'll Learn
Painted lady larvae shed their skin five times
The painted lady butterfly (Vanessa cardui) is the most widespread of all butterflies in the world. It is found throughout Europe, Asia, Africa, North America, and Central America. The painted lady's scientific name, Vanessa cardui, translates to "butterfly of thistle."
The larval stage of painted lady butterflies, also known as the caterpillar stage, typically lasts for about 10 to 14 days. However, the duration of the larval stage can vary depending on factors such as temperature, humidity, and food availability. During this stage, painted lady caterpillars undergo rapid growth and development as they feed voraciously on the leaves of their host plants.
As they grow, painted lady caterpillars shed their exoskeletons multiple times to accommodate their increasing size. Each molt, or instar, represents a new stage of development, with the caterpillar gradually growing larger and more mature. The caterpillars feed on a range of host plants, often favoring thistles, mallow, hollyhock, aster, and various legumes.
Towards the end of the larval stage, painted lady caterpillars enter a pre-pupal phase where they stop feeding and become less active. During this time, they may wander away from their host plant in search of a suitable location to pupate. The pupal stage, or chrysalis, is a crucial period during which the caterpillar undergoes a remarkable transformation called metamorphosis.
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Larvae feed on host plants
Painted lady larvae, or caterpillars, feed on a range of host plants. They are particularly fond of thistles, including tall thistle (Cirsium altissimum), a native North American perennial with purple, brush-like flowers, and Cobwebby Thistle (Cirsium occidentale), which is native to the western United States and has bright crimson to purple flowers. Other types of thistle that painted lady larvae feed on include weedy thistles in the Cirsium and Silybum genera, and the Yellow Star Thistle (Centaurea solstitialis).
Painted lady larvae also eat other plants in the Aster/Sunflower family, such as yarrows, sunflowers, and asters. They sometimes feed on plants in the Mallow family, especially weedy ones like Cheeseweed (Malva nicaensis), but also Hollyhocks, cultivated Malva spp., and both native and non-native Sidalceas. A native Mallow family plant that supports painted lady larvae is Checkerbloom (Sidalcea malvaeflora).
Native Borage family plants that painted lady larvae feed on include Popcorn Flower (Plagiobothyrs spp.) and Hound’s Tongue (Cynoglossum grande). Larvae will also feed on other Borage family plants such as Fiddleneck, Comfrey, and the cultivated herb, Borage.
Painted lady larvae have been known to feed on plants in the pea family, nettle family, and plantain family. They eat the leaves of their host plants and can consume large quantities of foliage before pupating. The selection of host plants is crucial as it provides the necessary nutrients for the caterpillars to grow and eventually metamorphose into adult butterflies.
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Larval stage lasts 10-14 days
The larval stage of painted lady butterflies, also known as the caterpillar stage, typically lasts for about 10 to 14 days. During this time, the caterpillars undergo rapid growth and development, feeding voraciously on the leaves of their host plants. They are black with spiky bristles and yellowish stripes or spots.
The duration of the larval stage can vary depending on factors such as temperature, humidity, and the availability of food. It is important to ensure that painted lady caterpillars have an adequate food supply, as they are quick to dehydrate and require a constant source of nutrition to sustain their rapid growth. Suitable host plants include mallow, hollyhock, thistle, daisy, purple coneflower, black-eyed Susan, and Rudbeckia.
Throughout the larval stage, painted lady caterpillars will molt several times, shedding their exoskeletons to accommodate their increasing size. Each molt, or instar, represents a new stage of development, with the caterpillar gradually growing larger and more mature. They go through 5 instars before reaching their ultimate size of about 1¼ inches and preparing to pupate.
As the caterpillars near the end of the larval stage, they enter a pre-pupal phase where they cease feeding and become less active. During this time, they may wander away from their host plant in search of a suitable location to pupate. The selection of a suitable host plant for this final stage is crucial, as it provides the necessary support and protection during the transformation from larva to chrysalis.
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Larvae grow rapidly, doubling in size
Larvae of the painted lady butterfly, also known as caterpillars, undergo a period of rapid growth and development. This larval stage typically lasts for about 10 to 14 days, but can vary depending on factors such as temperature, humidity, and food availability. During this time, the larvae feed voraciously on the leaves of their host plants, eating continuously for 5 to 10 days. This rapid growth is facilitated by their high metabolism and the abundant food sources they consume.
The painted lady larvae undergo several instars of growth, shedding their exoskeletons multiple times as they outgrow them. Each molt, or instar, represents a new stage of development, with the larvae gradually increasing in size and maturity. The number of instars varies, with some sources stating they go through 5 instars, while others mention several instars without specifying an exact number. However, it is known that during each instar, the larvae can almost double in size.
The process of molting is crucial for the larvae's growth. As they feed and grow, their exoskeletons become too tight, and they need to shed them to accommodate their increasing size. After molting, the larvae are left with a new, larger exoskeleton that allows for further growth. This process repeats several times until the larvae reach the final instar before pupation.
The rapid growth of the painted lady larvae is a fascinating aspect of their life cycle. During the larval stage, they can grow from tiny caterpillars to a size of about 1 1/4 inches in just a matter of days. This rapid growth is fueled by their constant feeding on the leaves of their host plants, which include thistles, mallow, hollyhock, aster, and various legumes.
The painted lady larvae's rapid growth and development during the larval stage are essential for their transformation into adult butterflies. By the end of this stage, they have reached the necessary size and maturity to enter the next phase of their life cycle, which involves forming a chrysalis and eventually emerging as beautiful adult painted lady butterflies.
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Larvae hang upside down before pupating
The painted lady butterfly (Vanessa cardui) is the most widespread butterfly species globally, found throughout Europe, Asia, Africa, and the Americas. The painted lady larvae, or caterpillars, undergo several instars of growth before pupating. During the larval stage, which lasts around 10 to 14 days, the caterpillars feed voraciously on the leaves of their host plants, growing rapidly and moulting several times as they outgrow their exoskeletons.
Before pupating, painted lady caterpillars enter a pre-pupal phase where they cease feeding and become less active. During this time, they may wander away from their host plant in search of a suitable location to pupate. The caterpillars hang upside down, attached by a single silken string, and form a naked chrysalis or pupa. The pupal stage typically lasts about 7 to 10 days, during which the developing butterfly undergoes profound changes, transforming from a larval form to an adult butterfly through a process called metamorphosis.
The painted lady caterpillar goes through five instars as it grows to a size of about 1 1/4 inches before pupating on the host plant. Each moult, or instar, represents a new stage of development, with the caterpillar gradually increasing in size and maturity. The final-instar caterpillar, for example, is fully grown and enters its moult to the pupa or chrysalis.
The painted lady's chrysalis is typically smooth and cylindrical with a tapered end. Its colour can vary from pale green or yellow to brown, providing camouflage. The chrysalis is suspended from a silk pad or thread attached to a substrate, such as a twig or leaf, which provides stability and protection during the vulnerable pupal stage. After completing its metamorphosis within the chrysalis, the adult painted lady butterfly emerges with wet and wrinkled wings. The butterfly then rests briefly before pumping hemolymph (blood) into its wings to expand and dry them.
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Frequently asked questions
Painted lady larvae go through 5 instars before pupating on the host plant.
An instar is a stage of development where the larvae shed their exoskeletons to accommodate their increasing size.
The larval stage lasts for about 10 to 14 days, but this can vary depending on temperature, humidity, and food availability.
Painted lady larvae feed on the leaves of a wide variety of host plants, including thistles, asters, mallow, hollyhock, and legumes.
It is important to provide painted lady larvae with a suitable environment, such as a cup with a lid and tissue paper, and maintain a consistent temperature of 68-78 degrees Fahrenheit.
