Blog Archives

How to Get Rid of Aphids on Milkweed

7/31/2019

Yellow aphids can appear in large colonies and are often a terrifying sight as they devour milkweed plants. They are a non-native insect and they can multiply very quickly. However, they are not a direct threat to monarch caterpillars because they feed on the milkweed plant only. They can indirectly affect caterpillar health by depleting nutrients in their only host plant. Using systemic insecticides to get rid of aphids can actually be much more harmful to the monarch caterpillars than the aphids themselves.

Remember, the key to a healthy habitat is a high diversity of insects and plants. We do not recommend using insecticides because they will kill much more than the aphids and most likely your monarch larvae as well. Even if the insecticide is labeled organic, that doesn't mean it's safe for caterpillars. Check the label for what insects are targeted by the insecticide. Watch for words that are used in place of ‘caterpillar’ such as leaf-roller, worm, moth and ‘other insects’. Insecticides that target moth caterpillars will also kill monarch caterpillars. Remember that insecticides can kill monarchs in all life stages: egg, larvae, pupae and adult.

Oleander aphid infestation on Common Milkweed (Asclepias syriaca)

What are oleander aphids?

The oleander aphid (Aphis nerii), sometimes called the milkweed aphid, is a common pest of milkweed plants. It is a non-native bug, most likely originating in the Mediterranean region where it's principal host plant, oleander, grows.
The Oleander aphid is a bright yellow insect with black legs, and stalks known as cornicles on the back of the abdomen.

Method One: Manual Removal

Although, time-consuming, the safest way to remove aphids is manually by squishing them between your fingers (use gloves to avoid staining your fingers) and then using a hose to dislodge them from the plant. Always check for monarch eggs and caterpillars before spraying because you could damage or dislodge them in the process as well.

It is best to catch the aphids before they become an aphid army, so even if there are just a few on the plant, remove immediately.

Method Two: "Contact Only"

This is a method recommended by Monarch Watch and was shared by Vic Jost @ Jost Greenhouses through Elliott Duemler at Taylor Creek Nursery. A mild solution of dish soap and water will also work.

• 1 part (e.g. 1 oz) Blue Dawn
• 1 part Isopropyl Alcohol
• 1 part white vinegar
• 128 parts (e.g. 1 gal) water

"Contact only" means that the insects have to have the mixture applied directly to their body for it to work.

*Use caution with this method because it will also kill monarch larvae if they come in contact with the solution. Rinse the plant when finished so you do not injure monarch larvae and other beneficial insects.

Method Three: Beneficial Insects

Beneficial insects are great for controlling numbers because they rarely harm monarch eggs, caterpillars, or adults and once introduced, they take no effort on your part! Once their food source is gone, they will generally leave your garden in search of food.

There are many species of beneficial insects. It is important to be able to identify these insects so you know which ones are on your side. Ladybugs, hover flies, lacewings, Aphidius wasps, and a few more types of beneficial insects devour aphids.

Ladybug larvae

Hoverfly

Green lacewing.

Sources

Monarch Joint Venture
https://monarchjointventure.org/resources/faq/aphids-on-milkweed

Monarch Watch
http://support.milkweedmarket.org/kb/article/359-how-do-i-treat-milkweed-plants-that-have-aphids/

Natural History of Orange County and nearby places.
http://nathistoc.bio.uci.edu/hemipt/OleanderAphid.htm

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Mindful Mowing for Monarchs

7/27/2019

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Gardens, lawns, fields, roadsides, public parks, and right-of-ways all provide vital habitat for monarchs and other pollinators. How we manage this habitat must be done with care so we don't destroy precious pollinator habitat.

Mowing too frequently or when it is poorly timed can be detrimental to the monarch population. However, according to a recent article in the Global Ecology and Conservation, strategic mowing can be beneficial to monarch populations when it produces young milkweed plants at the right time.

Minnesota's Department of Natural Resource's program called Roadsides for WIldlife, is a great example of mindful mowing!

The following recommendations will help you to time your land management practices so that the least amount of harm is done to our monarch populations.

For more information, read Mowing and Management: Best Practices for Monarchs by Monarch Joint Venture.

When should I mow?

Journey North reported Monarch sightings

The key to understanding when to mow is knowing when the monarchs are present in your area so you can better time your land management practices. For instance, if mowing occurs when there are monarch eggs, larvae or adults present on the milkweed, this will have a negative impact on monarch populations. This also applies to other land management practices such as controlled burns, targeted pesticide application and grazing.

Timing is crucial when planning your mowing and other land management practices. To find out where the monarchs are, you can view up-to-date monarch observations at Journey North or Western Monarch Milkweed Mapper.
Remember that this will vary each year so check each year.
In addition, you can conduct your own survey by checking your milkweed patch/field daily.
Once you understand where the monarchs are and when they will be visiting your habitat, you can create a strategic land management plan.

Monarch butterflies are often observed in the grasslands of Floyd Bennett Field. NPS Photo

Limit the frequency of your mowing

Mowing milkweed mid-summer in areas where there is a lull in monarch activity, such as the Southern Great Plains, may promote milkweed growth and late summer or early fall breeding (Baum and Mueller 2015; Fischer et al. 2015). Always, do a quick survey for monarchs before mowing and check a monarch monitoring website to see where the monarch is in their migration.

Leave a pollinator refuge area

Instead of mowing the entire area, leave refuge areas that may be good for nesting or overwintering sites for pollinators and other wildlife. If necessary, make a sign that indicates that site is an overwintering refuge.

Avoid mowing milkweed and blooming flowers

Blooming flowers provide essential nectar sources for pollinators. In addition, check to see if the flowers have began dispersing their seeds.

Increase your cutting height

Increasing your cutting height by a few inches will remove the seed heads of the invasive plants while still providing some habitat for other bugs and pollinators to thrive.

Sources

Fischer, S. J., Williams, E. H., Brower, L. P., & Palmiotto, P. A. (2015). Enhancing monarch butterfly reproduction by mowing fields of common milkweed. The American Midland Naturalist, 229-240.
Chicago

Habitat Enhancement and Best Management Practices in Highway Rights-of-Way.” Prepared by The Xerces Society for Invertebrate Conservation in collaboration with ICF International. 68 pp. Washington, D.C.: Federal Highway Administration.

Journey North. journeynorth.org/monarchs

Knight, S. M., Norris, D. R., Derbyshire, R., & Flockhart, D. T. (2019). Strategic mowing of roadside milkweeds increases monarch butterfly oviposition. Global Ecology and Conservation, 19, e00678.
Chicago

Monarch Joint Venture. Mowing and Management: Best Practices for Monarchs.
https://monarchjointventure.org/images/uploads/documents/MowingForMonarchs.pdf

Western Monarch Milkweed Mapper. https://www.monarchmilkweedmapper.org/

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Help With A Little H20: Supporting Monarchs From Your Own Garden

7/17/2019

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Written by Jennifer Coolie

Supporting the population of our beautiful monarch butterflies goes beyond planting colorful, nectar rich plants. “It’s easy enough to plant species that butterflies like to feed on, but you need to do more than that to support your local populations,” says Butterfly Conservation’s Richard Fox. Monarch butterflies are absolutely wonderful creatures, and need to be well looked after due to their dwindling population. Help make your garden more butterfly friendly by creating water sources for the butterflies to “puddle” in. "

Butterflies can be found sipping moisture from puddles or wet soil after a rain (known as "puddling"). Not only are they being hydrated but they also pick up salts in the process.

Monarchs puddling after a rain in their natural environment.

Water’s Role In Survival

Like humans, having a water source is essential to protect monarch butterflies. In the overwhelming heat of the summer, butterflies will gather extra minerals and vitamins through a behavior known as puddling. Through puddling, monarchs will take small drinks in shallow water areas rather than diving into a deeper water source. While it is important to create a butterfly garden rich with nectar plants and flowering shrubs, having a water source in the area is equally essential to promote butterfly survival. Creating a garden with water features that gives the butterflies an opportunity to puddle only helps make your garden space friendlier for future monarch butterfly populations.

The Shallower The Better

When choosing a water feature to help the endangered monarch population, look for multi-level fountains that have one of the levels with a shallow water line. Shallow water is more attractive than deep standing water for butterflies. If you prefer bird baths to fountains, this can still work because butterflies can puddle on the shallow edges of the birdbath. Alternatively, you can also create a butterfly oasis in the middle of a deeper water feature by simply adding in rocks, marbles or pebbles to make a perching paradise for the butterflies to puddle in.

Top Feeders. Photo by Orin Zebest. July 20, 2007.

Other Ways To Boost The Butterflies

If you’re looking to go above and beyond to make a perfect puddle paradise, add minerals to the water source. To supplement your butterfly water source with added minerals, sprinkle in some table salt or composting fruits (in small amounts to avoid polluting the water). Keeping the soil around your water feature damp can help the butterflies, says the Farmer’s Almanac. Finally, keep your butterfly water source in one consistent area so that your monarch friends can keep coming back.

It’s win-win: by placing a water feature in your butterfly garden, both you and the monarch butterfly population will benefit. You hear the tranquil sound of running water while your butterflies receive their essential minerals.

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Must-Have Host Plants for Your Butterfly Garden

7/15/2019

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What are host plants?
Host plants are the vital food source that caterpillars live on. Adult butterflies will seek out these plants to lay their eggs on because they know that the caterpillar cannot travel far and will not survive if placed on a plant that they cannot eat.

The key to a successful butterfly garden is to plant both nectar and host plants so that the butterflies will have a food source in all stages of their life cycles. Nectar plants are simply plants that produce nectar as a reproductive strategy. Almost all flowering plants produce nectar and many host plants double as a nectar sources.

Why plant native?
The evolutionary relationship between butterflies and host plants is the main reason for planting native plants in your garden. As a defense mechanism, plants have evolved to produce chemical alkaloids, also known as secondary metabolites, in order to deter herbivory (wildlife feeding on plants). In response, each butterfly species has evolved to be resistant to the toxins of just a small number of plants so their caterpillars have something to feed on.

Few native butterfly species use exotic or non-native plants as their hosts because they haven't created an evolutionary relationship with them. When we plant non-native glasses and exotic ornamentals such as Butterfly Bush (Buddleia davidii), we often remove the vital food sources for caterpillars and this leads to decreased populations. Ironically, butterfly bush does not serve as a host plant for any native species of caterpillars. To find out which plants are native to your area visit the Native Plants Database.

Be prepared for your plants to be eaten.
It is important to remember that the leaves of these plants will get eaten but that is the whole point! For this reason, it might be a good idea to plant them in less visible areas.

Black Eyed Susan (Rudbeckia hirta)

Host plant for: Silvery Checkerspot, Gorgone Checkerspot, Bordered Patch butterfly

Aster spp.

Host plant for: Pearl crescent, Painted Lady and more

Coneflower (Echinacea spp.)

Host Plant for: Silvery Checkerspot and more

Hollyhock (Alcea spp.)

Host plant for: Painted Lady, Common Checkered-Skipper and more

Dill (Antheum graveolens)

Host plant for: Black Swallowtail, Anise Swallowtail and more
NOTE: The Black Swallowtail will feed on any plants within the Parsley family.

Sunflower (Helianthus spp.)

Host plant for: Silvery Checkerspot, Painted Lady and more

Milkweeds (Asclepias spp.)

Host plant for: Monarch

Mallow (Malva spp.)

Host plant for: Common Checkered-Skipper, Gray Hairstreak , Painted Lady and more

Violet (Viola spp.)

Host plant for: Great Spangled Fritillary, Variegated Fritillary, Falcate Orangetip, Meadow Fritillary and more

Tall Verbena (Verbena bonariensis)

Host plant for: Common Buckeye, White Peacock and more

Sources

Bringing Nature Home: How You Can Sustain Wildlife with Native Plants by Douglas W. Tallamy, Publisher: Timber Press; Exp Upd edition (April 1, 2009)

Caterpillars of Eastern North America by David L. Wagner, Publisher: Princeton University Press; 1St Edition edition (August 14, 2005)

Butterflies and Moths of North America
https://www.butterfliesandmoths.org

Native Plant Database
https://www.wildflower.org/plants/

Penn State Extension Office
https://extension.psu.edu/programs/master-gardener/counties/york/maescapes/maescapes-blog/butterfly-larval-host-plant-list

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How to Get Rid of Aphids on Milkweed

What are oleander aphids?

Method One: Manual Removal

Method Two: "Contact Only"

Method Three: Beneficial Insects

Sources

Mindful Mowing for Monarchs

The following recommendations will help you to time your land management practices so that the least amount of harm is done to our monarch populations.

For more information, read Mowing and Management: Best Practices for Monarchs by Monarch Joint Venture.

When should I mow?

Limit the frequency of your mowing

Leave a pollinator refuge area

Avoid mowing milkweed and blooming flowers

Increase your cutting height

Sources

Help With A Little H20: Supporting Monarchs From Your Own Garden

Water’s Role In Survival

The Shallower The Better

Other Ways To Boost The Butterflies

Must-Have Host Plants for Your Butterfly Garden

Black Eyed Susan (Rudbeckia hirta)

Aster spp.

Coneflower (Echinacea spp.)

Hollyhock (Alcea spp.)

Dill (Antheum graveolens)

Sunflower (Helianthus spp.)

Milkweeds (Asclepias spp.)

Mallow (Malva spp.)

Violet (Viola spp.)

Tall Verbena (Verbena bonariensis)

Sources

Author

Archives

Categories

How to Get Rid of Aphids on Milkweed

What are oleander aphids?

Method One: Manual Removal

Method Two: "Contact Only"

Method Three: Beneficial Insects

Sources

Mindful Mowing for Monarchs

The following recommendations will help you to time your land management practices so that the least amount of harm is done to our monarch populations. ​For more information, read Mowing and Management: Best Practices for Monarchs by Monarch Joint Venture. ​

When should I mow?

Limit the frequency of your mowing

Leave a pollinator refuge area

Avoid mowing milkweed and blooming flowers

Increase your cutting height

Sources

Help With A Little H20: Supporting Monarchs From Your Own Garden

Water’s Role In Survival

The Shallower The Better

Other Ways To Boost The Butterflies

Must-Have Host Plants for Your Butterfly Garden

Black Eyed Susan (Rudbeckia hirta)

Aster spp.

Coneflower (Echinacea spp.)

Hollyhock (Alcea spp.)

​Dill (Antheum graveolens)

Sunflower (Helianthus spp.)

Milkweeds (Asclepias spp.)

Mallow (Malva spp.)

Violet (Viola spp.)

Tall Verbena (Verbena bonariensis)

Sources

Author

Archives

Categories

The following recommendations will help you to time your land management practices so that the least amount of harm is done to our monarch populations.

For more information, read Mowing and Management: Best Practices for Monarchs by Monarch Joint Venture.

Dill (Antheum graveolens)