Millipedes are susceptible to drying out so they live where it’s cool and moist, especially under leaf litter. They’re active at night but you might see them at dusk or on a very damp day when they come out to forage for decaying leaves, decaying plants or fungi.
They can’t bite or sting so their only defense is to curl in a ball and, when really irritated, release a stinky liquid.
At certain times of the year millipedes become restless and migrate from their normal living places; they [may] appear in window wells, basements, garages and other places where they become an annoyance.”
This restlessness usually has to do with mating. The crowd was looking for a cool damp place and made a mistake.
Don’t be alarmed. It’s too dry for them indoors. Penn State says, “Since millipedes do not live for more than a few days indoors, treatment inside the home is not necessary. Vacuum or sweep millipedes into a dust pan for removal.”
This moth can remember what it learned as a caterpillar.
In 2008, scientists at Georgetown University exposed late-stage tobacco hornworm caterpillars (Manduca sexta) to a specific scent and trained them to avoid it with a mild shock. The caterpillars got the message.
Scientists had thought that metamorphosis changed the brain so much that moths would not remember their caterpillar past. However, the caterpillars that learned about the scent in their last instar remembered the scent when they became moths — and they avoided it.
I wonder if other butterflies and moths remember their final days as caterpillars. Perhaps this is how females know to lay eggs on their host plant. “Hmmm,” says the butterfly, “This smells like the plant where I was feeding before I could fly.”
A long slender beak-shaped mouth part (proboscis) for sucking liquid food.
A partially hardened pair of front wings with clear tips and completely clear rear wings shorter than the front ones.
Few joints in the antennae and feet: antennae about five joints, feet usually no more than three.
Cicadas have these characteristics so they and 50,000 to 80,000 other insects are in the “true bug” Order Hempitera. This tiny green flatid planthopper is too.
But their status is more complicated. These two are true bugs but not true “True Bugs.”
Within Hempitera there’s a suborder of really True Bugs called Heteroptera. Cicadas, planthoppers, spittlebugs, aphids, and adelgids aren’t in this suborder. (See taxonomic chart from bugguide.net below.)
Eastern monarch butterflies, famous for their autumn migration from North America to Mexico, have declined 80-90% in the last 20 years. To help the butterflies many people collect eggs and caterpillars in the wild and captive-raise them to increase their chances of survival. Unfortunately this well-meaning act can damage the insect’s ability to migrate.
Researcher Ayse Tenger-Trolander at Univ. of Chicago stumbled upon this when she purchased captive-bred butterflies for her monarch migration study. To measure their autumn migratory drive she placed them in a flight simulator and noted the dominant direction they wanted to fly. Wild migratory monarchs orient South. The captive-bred monarchs chose random directions, unlikely to migrate.
To further test the butterflies, Tenger-Trolander collected wild monarchs and raised a new generation indoors, mimicking outdoor autumn conditions. Here’s what she found.
Furthermore, rearing wild-caught monarchs in an indoor environment mimicking natural migration-inducing conditions failed to elicit southward flight orientation. In fact, merely eclosing(*) indoors after an otherwise complete lifecycle outdoors was enough to disrupt southern orientation.
Chip Taylor, Director of Monarch Watch, pointed out on NPR that some captive-bred monarchs do make it to Mexico, but added that “The real reason for raising monarch butterflies is for the enjoyment, the education. [T]he idea of individuals saving caterpillars as “monarch rescue” is misguided. “That’s simply not going to work as a way to boost the population,” says Taylor. “What we really need to do is to improve the habitat.”
We’re learning that monarch migration is complex and very fragile. It’s easy to break it in a single generation.
Perhaps you already know this but it was news to me: Cinnamon repels ants.
Cinnamon comes from the dried inner bark of a tropical evergreen, the cinnamon tree (Cinnamomumsp.). Ants would eat these trees alive if they could but the cinnamon genus evolved a very effective defense: two chemicals, Cinnamaldehyde and Cinnamyl alcohol, that are toxic to ants. Ants stay away from cinnamon.
In this 9-minute video, the guy from You Can Science It shows that even swarming, warring ants will drop what they’re doing when confronted with cinnamon. He theorizes that it changes their messaging from “Kill the other colony” to “Oh no! It’s cinnamon!” (video begins where he starts discussing cinnamon. Click here for the full video.)
Yes, cinnamon repels ants but it has to be fresh and you have to use a lot of it.
Last week I saw two caterpillars and a butterfly that teased me: Who am I?
1. While taking closeups of Japanese snowball fruit (Viburnum plicatum) I saw the tiny green insect above looking at me from the corner of a leaf.
iNaturalist suggests he’s a moth in the genus Isa, a slug moth. However none of the photos show a caterpillar with a tiny black eye. He seems to be saying, “Who am I?” UPDATE, 24 July 2019: Monica Miller says he’s a planthopper, one of many confusing species.
2. On Lower Riverview Trail I paused where lots of tiny caterpillars were dropping to the ground on thin silk filaments. Were they a type of tussock moth? “Who am I?” UPDATE, 24 July 2019: Monica Miller confirmed my guess that these are hickory tussock moth caterpillars.
And in Schenley Park on the Greenfield Bridge I found an emperor. A hackberry emperor? A tawny emperor (Asterocampa clyton clyton). Thanks to Bob Machesney for the ID!
It’s that time of year again when fruit flies spontaneously appear in your kitchen. Where did they come from? How do you make them go away?
Fruit flies or “vinegar flies” (Drosophila melanogaster) love moisture and the vinegar smell of fermenting, rotting fruit. They and their eggs cling to fresh fruits and vegetables. They even squeeze through your screens to get to their goal.
One fruit fly becomes one hundred in a matter of days as we learned to our dismay when they invaded our office in 2012.
Back in 2008 a team of scientists made an amazing discovery: the western conifer-seed bug uses infrared sensors to find his favorite food.
The western conifer-seed bug (Leptoglossus occidentalis) is a North American sucking beetle that resembles a stink bug, though he’s not in the stink bug family. Ornately marked and 1/2 to 3/4 inch long (16-20 mm), he feeds on the sap of developing pine cones. This causes the seeds in the cones to wither which is only a minor problem in western forests but a big deal at pine seed orchards.
The seed bug used to be confined to temperate forests of the Pacific coast but has naturally expanded his range all the way east to Nova Scotia. In the past 20 years he’s been accidentally imported into Europe, Chile, and Japan so there’s international interest in how this bug finds pine cones at a distance.
Pine cones emit infrared light because they’re warmer than the rest of the tree by almost 60 degrees F. These photos from the study, taken in normal and infrared light, explain: “The temperature bar to the right of the paired images reveals that cones are up to 15°C warmer than foliage under high-cloud conditions.”
To prove that the bug is attracted to infrared, researchers set up infrared emitters shaped like pine cones (photos below). Did the bug approach them? Yes, it did. Could the bug find the cones when his IR sensors were experimentally blocked? No he could not.
As the study explains:
Here, we show that the western conifer seed bug, Leptoglossus occidentalis Heidemann (Hemiptera: Coreidae), a tissue specialist herbivore that forages during the photophase and feeds on the contents of seeds within the cones of many conifers (Blatt & Borden 1999; Strong et al. 2001), uses IR radiation from developing cones as a long-range foraging cue. We present data revealing that (i) cones are warmer and continuously emit more near-, mid- and long-range IR radiation than needles, (ii) seed bugs possess IR receptive organs and orient towards experimental IR cues, and (iii) occlusion of the insects’ IR receptors impairs IR perception.
Apparently the world looks very different to a western conifer-seed bug. For him the pine cones really stand out while the rest of the world is boring.
postscript: NOTE that the western conifer-seed bug (Leptoglossus occidentalis) is not the scourge of our western pine forests. The forests are being killed by a completely different native bug — the mountain pine beetle (Dendroctonus ponderosae) — whose larvae make galleries under the bark and kill the tree from inside. Below: Pines killed by the mountain pine beetle, Galleries under the bark, and the mountain pine beetle.
photo credits: Click on the captions to see the originals. * Infrared images from study at Royal Society 2008.0742, Creative Commons license * Western conifer-seed bug photos from Wikimedia Commons * Mountain pine beetle row of photos: #5540352: Kill at Deadman Road, CO, William M. Ciesla, Forest Health Management International, Bugwood.org, #UGA1254003, Galleries, William M. Ciesla, Forest Health Management International, Bugwood.org, #UGA1306005, mountain pine beetle, Dendroctonus ponderosae, Ron Long, Simon Fraser University, Bugwood.org