What is this insect?

[lbranner]

I tried zooming in on the bugs. They’re in all of the fertilizer piles on most of my trees. If they’re harmful, how should I treat them?

Thanks in advance

[Jeramiah]

Poop eaters who poop for other poop eaters so your tree can take up the nutrients of your fertilizer.

[lbranner]

glad to hear that my entire garden isn’t infested lol. thanks

[antelion]

woodlouse / slater aka roly poly. Be kind to them as they do now harm to your trees.
And, i fear your entire garden should be infested.

[Bonsai_Bentley]

Looks like an isopod. Probably just rolly-pollies. If you ever make a terrarium toss some of them in. They’ll control the fungi build up.

[Biogregw]

I agree with @Bonsai_Bentley it looks like an isopod of some kind