Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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Taxon on Aug 27, 2006August 27th, 2006, 10:14 am EDT
According to a group of Oregon State University researchers, sublethal level of exposure to pyrethroids (a class of synthetic pesticides derived from naturally occuring chemicals in chrysanthemums) are causing caddisfly larvae to prematurely abandon their cases, and be incapable of rebuilding them with satisfactory substitutes.
Here is a link to the full text of the news release.
Here is a link to the full text of the news release.