The Milkweed Grasshopper: Essential Facts and Insights for Enthusiasts

Milkweed Grasshoppers are a unique group of insects known for their colorful appearance and dietary preference for milkweed plants. These insects, also called “milkweed locusts,” can be found in various regions worldwide, feeding on the nutritious and toxic milkweed plants.

One fascinating aspect of Milkweed Grasshoppers is their ability to consume toxic milkweed without any harm. They can even accumulate the plant’s toxins within their bodies, making them unpalatable to predators. This incredible adaptation showcases the complex relationship between these insects and their preferred food source.

As you venture into the world of Milkweed Grasshoppers, you’ll discover intriguing facts about their behavior, life cycle, and the important role they play in the ecosystem. So, let’s dive in and learn all there is to know about these fascinating insects!

Milkweed Grasshopper Overview

Identification and Description

The Milkweed Grasshopper belongs to the order Orthoptera, which includes other grasshoppers and related insects. A notable example within this family is the African Bush Grasshopper (Phymateus viridipes), an arthropod known for feeding on milkweed plants.

Milkweed Grasshoppers can be identified by their:

  • Brightly colored bodies
  • Large size compared to other grasshoppers
  • Preference for milkweed plants as their food source

Geographical Distribution

Milkweed Grasshoppers are commonly found in:

  • Africa, particularly in regions with milkweed plant populations
  • Certain parts of the United States, where milkweed plants flourish

Comparison Table: Milkweed Grasshopper vs. African Bush Grasshopper

Feature Milkweed Grasshopper African Bush Grasshopper
Size Medium to large Large
Color Bright colors Bright green
Primary Food Source Milkweed plants Milkweed plants
Geographical Range Limited regions Widespread in Africa

Characteristics of Milkweed Plants:

  • Contain milky sap
  • Popular food source for monarch butterflies and milkweed grasshoppers
  • Found in locales such as Grand Canyon National Park and Illinois, where other milkweed feeders also reside
  • Butterfly Milkweed (Asclepias tuberosa) and Tropical Milkweed (Asclepias currasavica) are common species

Milkweed Plants and Their Role

Types of Milkweed

There are various species of milkweed, each with unique characteristics:

  • Common Milkweed (Asclepias syriaca): Most widespread milkweed, with pink flowers and milky sap.
  • Butterfly Weed (Asclepias tuberosa): Features bright orange flowers, ideal for gardens.
  • Swamp Milkweed (Asclepias incarnata): Thrives in wet environments, producing attractive pink blooms.
  • Showy Milkweed (Asclepias speciosa): Native to the western US, this species has large, star-like flowers.
  • Tropical Milkweed (Asclepias curassavica): Non-native species with red and orange flowers, found in California.
Milkweed Type Habitat Flower Color
Common Milkweed Widespread Pink
Butterfly Weed Gardens Orange
Swamp Milkweed Wet Environments Pink
Showy Milkweed Western US Large, Star-Like
Tropical Milkweed California Red, Orange

Milkweed and Monarch Butterflies

Milkweed serves as a critical resource for monarch butterflies. Monarchs lay their eggs on milkweed leaves. When those eggs hatch, milkweed becomes the primary food source for caterpillars. The ingestion of plants in the milkweed family benefits the monarchs as it can make them toxic to predators.

Importance in the Ecosystem

Milkweeds provide a variety of ecological benefits:

  • Nectar source: Many pollinators, such as bees and butterflies, rely on the nectar from milkweed flowers to provide energy.
  • Habitat: Native milkweed species assist in supporting biodiversity and providing a breeding ground for monarchs and other beneficial insects.
  • Seeds and pods: Animals like birds and small mammals use milkweed seeds and pods for nesting material or food.

Overall, milkweed plays a significant role in maintaining a balanced and thriving ecosystem.

Milkweed Grasshopper and Its Diet

Feeding Habits

Milkweed grasshoppers primarily feed on Asclepias species, which are commonly known as milkweed plants. These insects have a preference for Asclepias syriaca, also known as common milkweed. They tend to consume the leaves, flowers, and seed pods of these plants, helping them accumulate the toxic chemicals present in the milkweed.

Examples of milkweed species consumed by grasshoppers include:

  • Asclepias syriaca (common milkweed)
  • Asclepias subverticillata (horsetail milkweed)
  • Asclepias asperula (spider milkweed)

Comparison Table:

Monarch Caterpillars Milkweed Grasshoppers
Consume milkweed leaves Consume leaves, flowers, and seed pods of milkweed
Deposit eggs on milkweed plants Do not deposit eggs on milkweed
Larvae depend on milkweed for survival Not specific to milkweed

Toxicity in the Diet

While most insects cannot consume milkweed plants due to their toxic nature, milkweed grasshoppers and monarch caterpillars can eat them without any issues. The chemicals in milkweed, known as cardenolides, help protect these insects from predators by making them toxic.

Features of milkweed toxicity:

  • Toxic to most insects and pests
  • Contains cardenolides
  • Provides a natural defense mechanism for milkweed grasshoppers and monarch caterpillars

Both milkweed grasshoppers and monarch caterpillars benefit from the toxic compounds in milkweed plants for their survival and protection from predators. This unique dietary characteristic allows them to coexist with milkweed plants as they help control the spread of these potentially bothersome species.

Milkweed Grasshopper and Agriculture

Impact on Crops

Milkweed grasshoppers can damage crops by feeding on their leaves and stems. These pests are particularly known for their fondness for milkweed plants, but they can also affect other crops. Here are some examples of crops that can be affected:

  • Soybeans
  • Corn
  • Cotton

Pest Control Methods

There are several methods for controlling milkweed grasshoppers in agriculture. Some of the most effective methods include:


Using insecticides can be an effective way to manage milkweed grasshoppers. The Environmental Protection Agency (EPA) regulates the use of insecticides in the agriculture sector. Some examples of insecticides used for grasshopper control include:

  • Organophosphates (Group 1B) which are effective against various pests, including spider mites and soybean aphids.
  • Pyrethroid (Group 3A) insecticides, such as bifenthrin, which assist in controlling grasshoppers and spider mites on crop plants. However, they can contribute to mite population flares in some cases, so it’s crucial to consult product labels for appropriate usage.

Pros of using insecticides:

  • Effective against a wide range of pests
  • Fast-acting control

Cons of using insecticides:

  • May affect beneficial insects
  • Potential resistance development in pests

Cultural Practices

Implementing cultural practices, such as proper sanitation and crop rotation, can reduce the milkweed grasshopper population. This method is beneficial as it prevents creating a suitable habitat for these pests to thrive.

Pros of using cultural practices:

  • Minimizes the use of chemicals
  • Supports sustainable agriculture

Cons of using cultural practices:

  • May require more labor
  • Not always 100% effective

Biological Control

Biological control methods involve using natural predators, parasites, or pathogens to control pests like milkweed grasshoppers. This method has seen success in some regions, such as Africa, where the parasitic wasp Aprostocetus has been used to control grasshopper populations.

Pros of biological control:

  • Environmentally friendly
  • Beneficial for long-term pest management

Cons of biological control:

  • May take longer to see results
  • Requires careful management to ensure balance in the ecosystem

Milkweed and Wildlife Conservation

Preserving Monarch Habitat

The Monarch butterfly depends on milkweed for their survival, as it is the only plant on which the female monarch lays her eggs and the larvae, or monarch caterpillars, rely on it for sustenance. Due to habitat loss and pesticide use, the Monarch butterfly population has experienced a decline, making conservation efforts crucial. Planting milkweed, especially along migration routes, is one way to help support these iconic creatures.

Promoting Pollinators

Milkweed not only benefits Monarch butterflies, but it also plays a critical role in feeding and preserving other pollinators. Here are some examples of beneficial wildlife that rely on milkweed:

  • Bees
  • Birds
  • Small mammals
  • Amphibians
  • Reptiles

By planting milkweed, gardeners contribute to a thriving ecosystem that supports various pollinators and helps ensure crop pollination.

Encouraging Native Milkweed Growth

Using native milkweed species for conservation efforts is crucial to support the local ecosystem. According to the Xerces Society, promoting regional milkweed species can result in successful habitat restoration.

Region Native Milkweed Species
Midwest Common Milkweed (Asclepias syriaca), Butterflyweed (Asclepias tuberosa)
Northeast Swamp Milkweed (Asclepias incarnata), Whorled Milkweed (Asclepias verticillata)
South Tropical Milkweed (Asclepias curassavica), Aquatic Milkweed (Asclepias perennis)
West Showy Milkweed (Asclepias speciosa), Mexican Whorled Milkweed (Asclepias fascicularis)

Choosing region-appropriate milkweed species offers the following benefits:

  • Supports pollinators, especially Monarchs
  • Improves biodiversity in gardens and landscapes
  • Resists invasive species

Remember to consult local guidelines and experts before planting to ensure you’re using the best milkweed species for your area.

Growing Milkweed at Home

Gardening Tips

Growing milkweed can attract beneficial insects like the Milkweed Grasshopper, and is essential to Monarch butterflies. Start by choosing the right species for your garden. Gardeners often prefer swamp milkweed and butterfly weed due to their clumping growth habits. Milkweed can be grown from seeds or transplants, and prefer well-draining soil with full sun exposure. Water regularly during dry periods.

Milkweed Species:

  • Swamp milkweed (Asclepias incarnata)
  • Butterfly weed (Asclepias tuberosa)


Milkweed seeds require stratification, a process that mimics natural winter conditions. To stratify seeds, follow these steps:

  1. Soak seeds in water for 24 hours.
  2. Drain and place seeds in a sealed plastic bag with damp sand or paper towels.
  3. Refrigerate for 30 days, occasionally checking moisture.

Seed Planting

After stratification, plant milkweed seeds directly in the garden or in pots. Plant seeds about 1/4 inch deep and keep the soil moist until germination occurs.

Seed Planting Tips:

  • Sow seeds in late fall or early spring.
  • Space plants about 18-24 inches apart.
  • Be mindful of taproots; they may not transplant well.
Species Growth Habit Height Bloom Time
Swamp milkweed Clumping 3-5 ft Summer
Butterfly weed Clumping 1-3 ft Summer

Pros of Growing Milkweed:

  • Attracts beneficial insects and pollinators
  • Provides vital habitat for Monarch butterflies
  • Adds beauty to your garden

Cons of Growing Milkweed:

  • Some species may spread aggressively
  • Taproots can make transplanting difficult

Potential Risks of Milkweed Grasshoppers

Impact on Pets and Livestock

Milkweed grasshoppers can pose risks to pets and livestock, mainly due to their diet. These insects feed on milkweed, which contains toxic compounds called cardenolides. Consuming these toxins can lead to several health issues such as:

  • Vomiting
  • Diarrhea
  • Abnormal heart rhythms

For example, a dog that eats a milkweed grasshopper might experience vomiting or diarrhea due to ingesting the toxins present in the grasshopper’s body.

Threats to Milkweed

Milkweed serves as an essential food source for monarch butterflies, and their decline has been linked to the loss of milkweed habitats. Milkweed grasshoppers can further harm milkweed populations, particularly by feeding on the seeds, like in the case of large milkweed bugs (Oncopeltus fasciatus)1.

Summary of Risks

  • Toxicity: Grasshoppers consuming milkweed ingest cardenolide toxins, posing risks to pets and livestock.
  • Milkweed Threat: Grasshoppers can harm milkweed plants, impacting monarch butterfly populations.

Comparison Table

Risks Pets and Livestock Milkweed
Consuming Toxic Grasshoppers Yes Not Applicable
Eating Milkweed Seeds Not Applicable Yes

Adaptive Features and Natural History

Physical and Behavioral Adaptations

  • The Milkweed Grasshopper is a type of pest that feeds on milkweed plants.
  • They have developed a bright coloration as a warning sign to predators like birds due to their toxic diet of milkweed.
  • Some species are known to mimic the appearance of toxic insects, like monarch butterflies, for protection.

Migratory Behavior

  • Milkweed Grasshoppers are often found in grasslands and crops where milkweed plants grow.
  • In the Western United States, they are known to have short migratory flights for food and mate searching.
  • Their migratory habits vary depending on factors such as weather conditions and food availability.
Features Milkweed Grasshopper Other Grasshoppers
Diet Milkweed Various plants
Coloration Bright Usually dull
Migratory Flights Short Varying
Main Predator Birds Birds

Some challenges these grasshoppers face include:

  • The increasing usage of herbicides that affect their milkweed food source.
  • The presence of parasites that can jeopardize their population.

Despite these challenges, Milkweed Grasshoppers continue to adapt and survive in their changing environment.




  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

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4 thoughts on “The Milkweed Grasshopper: Essential Facts and Insights for Enthusiasts”

  1. We saw something similar last weekend (30.4.2017), hiking Kasteelberg in Riebeek Kasteel, Western Cape. They started appearing the further we got to the rocky top of the mountain.
    As you mentioned, they change colour during maturation process – we took some pictures that look exactly like the one displayed above, but much brighter in colour. Is it the same species just ‘older’ as the colour is much brighter?

    We also saw big ones in a dark red & black colour.

    I’d love to add pictures to get more information – please contact me so I can send them perhaps?

    Thanks & Cheers

  2. We saw something similar last weekend (30.4.2017), hiking Kasteelberg in Riebeek Kasteel, Western Cape. They started appearing the further we got to the rocky top of the mountain.
    As you mentioned, they change colour during maturation process – we took some pictures that look exactly like the one displayed above, but much brighter in colour. Is it the same species just ‘older’ as the colour is much brighter?

    We also saw big ones in a dark red & black colour.

    I’d love to add pictures to get more information – please contact me so I can send them perhaps?

    Thanks & Cheers


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