Tag Archives: Quercus

Previews of Parasitoids

Lately I’ve taken to getting backlit shots of leaf mines by removing one of the Twin Lite flash heads and holding the leaf on top of it, so that when the flash goes off the mine is illuminated from both sides. … Continue reading

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Monthly Mystery #21: Double Cocoons

On pages 219-220 of Tracks & Sign of Insects, I described the cocoon of Neurobathra strigifinitella (Gracillariidae) according to the account of Heinrich and DeGryse (1915)*. I then included a photo of a mysterious cocoon found on the underside of a sugar … Continue reading

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Nantucket Moths

As you have probably guessed, my lack of posts lately has been due not to my having run out of things to write about (I don’t think this could ever happen to someone who spends any time observing insects), but … Continue reading

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Arizona Oak Galls, Part 5

Here is yet another gall from Arizona white oak. It is another “oak apple,” superficially similar to these, which I now know to be Atrusca aggregata (thanks to Jim Zimmerman, who has studied southwestern cynipid galls for many years and … Continue reading

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Arizona Oak Galls, Part 4

Here is yet another type of gall found on the underside of oak leaves in Madera Canyon. Seven weeks after I collected these, two parasitoids emerged. The one above is another male Torymus (Torymidae), which may or may not be the same … Continue reading

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Arizona Oak Galls, Part 3

Okay, having looked at photos of all the possible species, I’m pretty well satisfied that Arizona white oak (Quercus arizonica) was the host of all of the galls I collected in Madera Canyon that actually produced adult cynipid wasps. Armed … Continue reading

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Arizona Oak Galls, Part 2

Gall #2 is a fancy cup-shaped one found on the undersides of leaves, sometimes in clusters. A month after I collected them, the galls (kept in a tightly sealed vial) had become covered with mold, but a single wasp chewed … Continue reading

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Arizona Oak Galls, Part 1

On my trip around the western US in the fall of 2012, I mostly limited my collecting to leafminers.  However, I made an exception when I got to Madera Canyon, Arizona, because I had found all kinds of interesting oak … Continue reading

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Monthly Mystery #17: A Mystery in Reverse

Normally with natural history mysteries, there is some unexplained object or pattern that I wonder about until I stumble across an answer in the literature, or failing that, I eventually manage to locate or raise the organism that is responsible.  But … Continue reading

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Two-year Gall

This may be a pretty generic-looking gall wasp (Cynipidae), but it has an interesting history.  My first visit to Nantucket, in September 2011, was an intensive four-day survey with Noah Charney and Sydne Record in which we documented as many … Continue reading

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