Moths From A Willow Leaf

Over the past few days, a break in fieldwork has given me a chance to start catching up on going through my photos from this year—I’m exactly five months behind at the moment. On March 19 I finally got to the end of a story that started with the Berkshire BioBlitz on June 19 of  the previous year. I had collected this leaf of silky willow (Salix sericea) in the hope of finding out which of the nine willow-feeding species of Phyllonorycter (Gracillariidae) was responsible for the leaf mine on it, since as far as I know there is no way to distinguish among the mines of these species (though a few can be ruled out based on geography).

IMG_7180IMG_7179

In my hurry to document as many species as possible in a short time, I didn’t investigate what had made the webbing and leaf fold next  to the mine. This nearly proved disastrous, since it turned out a caterpillar was hiding in the leaf flap, and by the next day it had consumed much of the leaf. Fortunately, it didn’t eat too much of the mined portion.

IMG_7265IMG_7264

I moved the caterpillar to a separate vial with fresh willow leaves. I don’t usually collect non-micro moth caterpillars to rear, but when they show up on leaves I’ve already collected I figure I might as well.

IMG_7956IMG_7958

On June 28, the adult leafminer emerged, revealing itself to be Phyllonorycter salicifoliella, and leaving its pupal skin protruding from the mine.

IMG_8435IMG_8537

The externally feeding caterpillar developed much more slowly, and I had to keep collecting new willow leaves to feed it. Here it is on July 6 with an old willow leaf that has gone yellow:

IMG_8969

On July 29 it was looking pretty different:

DSC_7022

The last photo I took of it was on August 4…

DSC_7075

…but I noted in my journal that it turned pink and burrowed into soil on August 12. As it happens, I had tried to rear this same species eleven years earlier (from a caterpillar feeding on black cherry), so I have a photo to illustrate just how pink it was when ready to pupate:

shutesbury aug 26 009

Nothing stirred in the jar for the rest of the year. I put it in the fridge over the winter, taking it back out on March 1. Almost three weeks later, an adult confused woodgrain (Noctuidae: Morrisonia confusa) appeared in the jar. Having no further use for it, I let it out to see if it could find others of its kind. Here it is resting on a fallen white pine at the edge of my yard:

DSC_9125

About Charley Eiseman

I am a freelance naturalist, endlessly fascinated by the interconnections of all the living and nonliving things around me. I am the lead author of Tracks & Sign of Insects and Other Invertebrates (Stackpole Books, 2010), and continue to collect photographs and information on this subject. These days I am especially drawn to galls, leaf mines, and other plant-insect interactions.
This entry was posted in Uncategorized and tagged , , , , , , , , , , , , , , , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s