Creosote Bush Bagworm Population Crash?
Most observations of Creosote Bush Bagworm (Thyridopteryx meadii) on iNat are of the distinctive case it constructs as a larva. It has two seasons; the main one Jan-Mar after the first winter rains, and a second one Sep-Oct after summer rains. I think it may be experiencing a population crash. Last year I observed five during the winter season. This year so far I have seen none despite looking at far more creosote bushes. Neither has anyone else. In fact, the last iNat observation was September 5, 2022... (as of 2/21/23). https://www.inaturalist.org/taxa/475010-Thyridopteryx-meadii
Downloading data using filter... Here are the attributes I am selecting at first:
user_login
time_observed_at
species_guess
scientific_name
Here is an example using https://www.inaturalist.org/observations?place_id=any&quality_grade=research&subview=table&taxon_id=475010
Filters --> Research Grade --> Download
That gets you to the Create Export Query. I uncheck everything (None) and then click back the four attributes I want for now (see above). I may add location later.
Then I select "Create Export" which takes a minute or so.
Then I select "Download" and save the zipped .csv file to Download_Export_Data folder on my Mac.
The file is created, in this case observations-294557.csv.zip which I double click to unzip the .csv file
observations-294557.csv is created, which I rename appropriately, in this case Thyridopteryx_meadii_observations_2023_02_07.csv
I then upload the .csv file to Google Drive iNat/iNat_Export_Data, open, and save as Google Sheet.
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http://mothphotographersgroup.msstate.edu/species.php?hodges=455
https://bugguide.net/node/view/83066
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Over the last 6 months or so, I’ve looked at thousands of creosote bushes. I’ve seen lots of interesting things, but no bag worms mostly in eastern Nevada around Las Vegas.
Thanks for letting me know. I've also looked at about a thousand, and I managed to find two fresh ones in the Western Mojave. I haven't posted them yet because of a backlog of observations, but will pretty soon. I'll also write a little summary then.
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