Category: Bug of the Week (Page 125 of 219)

Bug of the Week: Fall Butterflies and the Plants that Feed Them

Generally we don’t think of butterflies and fall going together, but there are butterflies active in the fall. To tank up for fall migrations, and to get ready for overwintering, these butterflies use late-blooming flowers for nectar.

This week we had a surprising number of butterflies visiting our willow acacia tree, which is in full blossom.

The powder-puff flowers of the willow acacia might not look like much, but they must have nectar because the bees are also visiting them in droves. The tree fairly hums on warm days.

The painted ladies were migrating through. One week you won’t see any, the next week they are everywhere.

Painted ladies also visit the lantana flowers, another good source of nectar for butterflies.

Not as noticeable, but just as numerous on the willow acacia are the snout butterflies. This butterfly’s pointed “snout” is almost as long as its antennae. Notice how camouflaged it is when it has its wings closed.

The giant swallowtails are constantly on the move. It is hard to get a photograph of one. They visit our citrus trees, which are food for the caterpillars.

We also saw a monarch butterfly in the willow acacia this week, also moving too much to be recorded. The monarchs are known for their long migrations this time of year.

We tend to have these skippers throughout most of the year. They use lantana as well.

We also saw queen butterflies. The last queen butterfly to emerge from our milkweed vine was smaller than the rest. It still enjoyed our asters.

It was interesting that these asters were blooming when we visited New England in October, and our Arizona asters were in full bloom when we got back home. Asters are also important sources of nectar for honey bees.

Of course, goldenrod is another common fall flower that is a good source of nectar. Once ignored as a weed, there are now cultivated varieties for the garden.

If you would like to put in a fall butterfly garden,  the Brooklyn Botanical Garden has some suggested plants.

Have you seen any butterflies this week?

Bug of the Week: Manduca rustica Larva

One reason to keep a photo journal of insects like this is so you can record what you find the insects feeding on.

In the past we had found the caterpillars of the rustic sphinx moth, Manduca rustica, eating leaves high in our desert willow tree.

This week, however, we found a caterpillar munching on our cats-claw vine.

My son suggested that because both plants have tubular flowers, long seed pods and winged seeds, that perhaps the plants are related. I looked it up, and it turns out that both desert willow and cats-claw vine belong to the family Bignoniaceae. They are related!

From now on we’ll keep an eye out for rustic sphinx caterpillars on both plants.

Bug of the Week: Banded Woolly Bear

It is so fun to travel to new places and meet new insects. Take, for example, the banded woolly bear, Pyrrharctia isabella.

We don’t have this species of caterpillar in the low deserts of Arizona (although we do have another type people call woolly-worms). Banded woolly bears like this one are found further north, where the winters are cold and snowy.

Banded woolly bear caterpillars eat a variety of plants, including grasses, certain trees, and wildflowers such as asters and sunflowers.

In the fall when they are finished eating, banded woolly bears crawl here and there in search of a protected place to overwinter. That’s when most people see them.

If you try to pick one up, it will curl up into a ball and remain still. After a short time, it will uncurl and crawl away.

Do you know what the caterpillar turns into? In the spring, after spinning a cocoon and pupating, the banded woolly bear becomes a yellowish Isabella moth.  (See more photographs of the Isabella moth).

Scientists have been studying how the caterpillars and their relatives manage to survive under freezing conditions. In one extreme case, another woolly bear from the Arctic lives for many years by feeding briefly in the summers and then freezing up – for as many as fourteen or more years in a row – before becoming an adult.

Discovery Channel has shared an amazing video from Frozen Planet. Note:  The video shows a close-up shot of caterpillars freezing and thawing with dramatic music, which may be disturbing to certain sensitive children. Also, a second video comes up that takes about the filming.

Young readers might enjoy Oh No, Woolly Bear!, a Lift the Flap Book by Patricia McFadden and illustrated by Michéle Coxon.


Disclosures: The book was from our local library. Also, I am an affiliate for Amazon. If you click through the linked titles or ads and make a purchase, I will receive a small commission at no extra charge to you. Proceeds will be used to maintain this self-hosted blog.

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