Category: Learning Outdoors (Page 38 of 63)

Bug of the Week: Paper Wasp

This morning it has been partly cloudy, but during a burst of sunshine I was able to catch a photo of this paper wasp, Polistes flavus.

paper wasp

Any idea what she might be doing?

paper wasp

Look how shiny she is. Her eyes are shaped like kidney beans. She has three smaller eyes called ocellae in a triangle at the top of her head.

She was hunting for caterpillars and other insects. Wasps feed their young larvae bits of insects they catch and bring back to their extraordinary paper nests.

You might wonder whether I was in any danger taking this photo. In fact, this species of paper wasp that we encounter in Arizona is surprisingly unassuming. Unless you directly threaten their nest, they are not likely to sting. Their nests are often hidden in the dense foliage in small shrubs, such as rosemary bushes or under red yucca (hesperaloe) in our yard. We are much more likely to be stung by bees than these wasps.

I have noticed several paper wasps around my mint plants lately. I hope they are catching the cabbage loopers that have been devastating the plants. Go wasps, go.

Bug of the Week: Spider Mite Predators

In a previous post about hollyhock visitors, I mentioned the plants had spider mites. I wondered when the spider mite predators would show up. Turns out I didn’t have long to wait.

Spider mites are barely visible with the naked eye, and many of the beneficial insects and arachnids that feed on them are also incredibly tiny. In fact, I wished I had a microscope instead of a camera this week. Let’s take a “look.”

spider mite destroyer beetle

Those grayish black circles towards the top are lady beetles, but not the large orange and black ones like you might expect. These are called spider mite destroyers (Stethorus picipes). If you were not looking closely they might look like a bit of dirt or tiny seeds on the plant leaf. I can tell they are lady beetles by their rounded shape.

spider mite destroyer beetle pupa

The lady beetle larvae are on the plant feeding on the spider mites as well, as evidenced by the greyish pupa lying along the middle of the leaf.

You can see more of the life stages at the UC Davis IPM Online site.

red mite

A large red mite like this one might seem to be a bigger version of a problem mite, but it is actually a beneficial predator of spider mites. When you see single red mites that are readily visible and actively crawling about on leaves, that is probably a predatory mite feeding on plant mites or small insects. Mites have round bodies and eight legs.

minute pirate bug

Other point-sized predatory insects on the hollyhocks are minute pirate bugs (Orius tristicolor). (That is “minute” as in small, not the word for time.) The adults are black and white.

Minute pirate bugs feed on a number of small insects and mites. Here are some young pirate bugs or “nymphs” feeding within the webs of the spider mites. The nymphs are orange.

minute pirate bug nymphs

For a better look at the life stages, try this biological control page.

I didn’t get photos, but there were also some predatory thrips eating spider mites. Thrips are often thought of as plant pests, but some species are predatory.

It is great to see all the beneficial organisms having a banquet of spider mites. And I didn’t have to do anything except watch the show.

Weekend Science Fun: Bird Moms (and Dads)

Right in time for Mother’s Day, we have a hummingbird nest filled with two baby hummingbirds outside our upstairs front window. There is a creeping fig vine that climbs over the front door and this is the fifth time hummingbirds have nested on it.

baby hummingbird

Do you think that is the mother bird or a baby? We know from experience that it is a baby because the mother’s beak is much longer relative to her head size. As you can see, the mother bird is a bit messy about the bird droppings.

I’m afraid this isn’t the best photo. The circumstances are less than ideal to take a photo and I didn’t want to disturb the chicks in any way. The nest is incredibly tiny and very hard to spot.

Take a look around your neighborhood and see if you can locate any birds making nests. You might want to take photos and make records of what is happening to the nest over time. Always be sure to respect the birds and stay well out of their way as much as possible.

If you want more opportunities to watch birds, you can put up bird nest boxes. Take a look at Nestwatch for ideas and projects.

If you can’t find a nest to watch, check the Cornell Lab of Ornithology Nest Cams.
If you have a sensitive youngster, be aware that the owls and hawks feed their young animal prey and it shows on some of the cams.

Looking back, we have had quite a few posts about birds. Here are links to a few.
Build a Bird Nest (Human-sized)

Bird Watching and Making Nest Cards

Desert Bird Curriculum Guide

Pigeon Watching

Have fun and let us know what you see.

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