Category: Bug of the Week (Page 80 of 219)

Bug of the Week: A Different Lady Beetle Larva

This week let’s take another look at the diverse community of insects found on the rush or desert milkweed.

Dusky Lady Beetle Larva with Aphids(Photograph by Lynne S., used with permission)

What do you see here? Probably the first things you notice are the bright orange-yellow aphids. Those are oleander aphids.

Dusky Lady Beetle Larva with Aphids on Milkweed(Photograph by Lynne S., used with permission)

But, what is the insect with the bright white fluffy look?

The insect that looks like a tiny white carpet is actually a lady beetle larva. Instead of the bright red-and-black lady beetles we usually think of, this larva will turn into a small dark brown or black beetle.

These nondescript beetles belong to a group called dusky lady beetles (Tribe Scymnini). The adults are round in shape, like other lady beetles, and feed on aphids, scales and mealybugs, too. The main difference is that the larvae produce a white waxy coating, which is thought to help protect them from predators.

Have you ever spot an adult dusky lady beetle or a larva? Where did you find it?

Bug of the Week: Cicada Season

Right in time for Father’s Day, we heard our first cicada singing yesterday.

cicada-side-good

It seems like the local Arizona species of cicadas always start singing the third week of June, or around Father’s Day. They are highly predictable.

cicada-back-19

Of course our annual cicadas aren’t as wondrous as the red-eyed periodical cicadas.

Snodgrass_Magicicada_septendecim(Public domain illustration by Snodgrass from Wikimedia).

You have probably heard about periodical cicadas. The adults emerge in large groups after long period underground. Some come out every 13 years. Others spend a whopping 17 years underground.

 

Magicicada_septendecim(Public domain photograph of 17-year cicadas from Wikimedia).

How easy is it to predict when a given insect will emerge or arrive in a certain area? The annual emergence or migrations of insects may depend on weather factors, such as temperature, winds, rains, etc. Those in turn change the availability and timing of host plants, which influence insect development. Insect emergence is often unpredictable, although scientists have created complex mathematical models to track certain pest species.

Cicadas, on the other hand, are protected underground. They also feed on fairly stable hosts, namely trees. Perhaps it is a combination of those factors that allow cicadas to be so predictable relative to other insects.

By the way, some broods of the periodical cicada are emerging in 2015, mainly along the Mississippi River basin area. Check Magicicada.org for more details and links to citizen science projects.

Are the cicadas singing where you live? Have you ever seen an emergence of the periodical cicada?

Bug of the Week: Texan Crescent Butterfly

Do you remember our recent butterfly gardening week? Today we have additional evidence that “if you plant it, they will come.”

Look what was in our yard:

new-texan-crescent-bst16A brand new Texan crescent butterfly was drying its wings!

Since it was so freshly emerged, it seemed likely that its caterpillar had been feeding on a nearby plant. Which one? (If you’d like to see what the caterpillars look like, Butterflies of America has a page of photographs.)

Dicliptera-flower-055

After consulting two books about Arizona butterflies, apparently Texan crescent caterpillars feed on a plant called Arizona foldwing, Dicliptera resupinata.

Dicliptera-leaves-044

We just happen to have Arizona foldwing growing in that area of the yard. How cool is that? Hopefully, we’ll see some Texan crescent caterpillars soon.

Last week we talked about butterfly families and gave the answers to our previous post, butterfly identification for beginners.

What butterfly family does a Texan crescent belong to?

new-texan-crescent-side-074Let me give you a hint. Count the number of legs.

Doesn’t it look like the adult butterfly has only four legs? That means it is a brush-footed butterflies or member of the family Nymphalidae. Although it does have front legs, they aren’t used for standing.

 Do you have any caterpillar food plants in your yard?

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