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Gray and off-white beetle larvae/grub (scarab beetle grub)

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Scarab beetle grub
by: Moni

Shanna
You are correct in what you think it is. Without having the grub in hand to key to species, it is one of the large Scarab beetle larva. There is no record of the Hermit flower beetle in TX, so it has to be one of either the ox (genus Stratgus) or Hercules (genus Dynastes) beetle grubs.
They are not a pest as the larva feed on decaying organic matter like rotten logs or potting mix.
Here is a great discussion about them from TX A&M - http://insects.tamu.edu/fieldguide/bimg144.html

So, plant the garden and do not worry about them....they sure are big critters!!
Thanks for the great description and photo size comparison.

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