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compare to this: http://agrozoo.ne...&l2=en. Larva images taken by me.
Doh I dont give any guarante, From my point of wiew, anything that looks like this and is size of this is May bug. It appears in 'large' quantities, any other scabidae is less frequent.

How to grow ? Splash it. :) And any other that you find, that shoud do it.