25 August 2022

Since moving to the 6th floor of a high-rise two years ago we have had no indoor bugs at all. Then, about a week ago, two extremely small bugs with waists and knobbed antennae showed up on the kitchen floor, standing there just outside the bottom of the stove.

They are not interested in water or sweets but only rarely attracted to a very tiny bit of grain or seed. They never fly. They just walk slowly — so slowly that it’s easy to catch one and put it in a ziploc bag (shown below).

Finding two bugs was a curiosity but a week later finding 20 bugs every morning felt like a problem. I checked inside my food cupboards — no bugs at all — and gave my bug-ziploc to building maintenance who is checking for bugs in adjacent units. I’m not to spray in case there will be a multi-floor solution in the days ahead.

Meanwhile Nature’s solution to tiny bugs ran right up to me.

This morning a house centipede (Scutigera coleoptrata), a top predator of insects, ran toward me across the carpet. I screamed! Then I remembered he would eat those little bugs if I could just catch him alive and carry him to the kitchen.

Catching a centipede on the spur of the moment is very tricky. (They run fast!) I fashioned a piece of paper to enclose him and got him to run onto the paper but time after time he ran out the corners of the trap. Finally I enclosed him, carried him to the kitchen, and let him loose below the stove.

A top predator has been moved into position under the stove. I can hardly wait for the house centipede to eat those mystery bugs!

Learn more about house centipedes in this vintage article.

p.s. No, I did not add a centipede. I just moved one about 20 feet.

And I am wondering… Are the mystery bugs actually sawtoothed grain beetles (Oryzaephilus surinamensis)? If so they arrived in someone’s groceries.

(photos by Kate St. John and from Wikimedia Commons; click on the captions to see the originals)

20 August 2022

Last weekend in Lower Frick Park Charity Kheshgi and I saw thousands of caterpillars and a lot of frass dropping from the trees above the pedestrian bridge over Nine Mile Run (pictured above).

Many insects are specialists, consuming a single plant family or genus during in their larval phase. If you can name the plant the caterpillar is eating, you can narrow down the identity of the bug.

Using that method I tried to name the leaves the caterpillars were skeletonizing (eating habits are another clue!) but most were too damaged to identify. Eventually I found a few intact elm-like leaves.

The photo match for “larvae that skeletonize elm leaves” included an adult form matches the golden yellow mystery beetle I saw this summer in Frick Park. These are larger elm leaf beetles (Monocesta coryli).

The “larger” beetle is a pretty big bug, shown for scale on someone’s hand in this photo by Bill Sweeney embedded from bugguide.net, and its color varies. Click here to see an orange one.

Here’s what it will do next.

There is only one generation per year. Eggs are laid in the spring in “hard yellow crusty” masses of 24 to 58 eggs on the undersides of elm leaves. They hatch in about two weeks.

The newly eclosed larvae are about 3 mm long and greenish-yellow. They are gregarious for three to four days and feed on leaf surfaces before dispersing. The mature larvae crawl down the tree and undergo a wandering phase for a few days before entering the ground, where they remain until pupation the following late winter or early spring. Pupation lasts about a month and adults begin emerging in April. Adults are active from April until early August, with most records from June to July. Both adults and larvae exude an orange, presumably defensive, fluid when disturbed.

— Univ of Florida Entomology: Larger Elm Leaf Beetle

So why are these not caterpillars? Because the larvae of beetles are called “grubs.”

(photos from bugwood, from bugguide and by Kate St. John, click on the captions to see the originals)