Please help, white bugs in root ball.

I went to check my gorilla grow today and saw my newest growth on only one plant(my healthiest plant) had barely been affected by the tips of the new leaves starting to turn black. I then was looking at the plant and at the bottom of its little pot white bugs were crawling into the drainage holes. So I just went to transplant it into a bigger pot and a couple hours before transplanting I sprayed the drainage holes on the bigger pot with fungicide/insecticide stuff with neem oil and diatomaceous earth inside the drainage holes to soak the soil inside the drainage holes. When I was just transplanting it and took it out of the pot there were at least 40 of those little white bugs near the root ball so I spent time getting all of them out and transplanted it so it hopefully will do better and ill probably put a ton of diatomaceous earth as a top dress and water in the plant again to keep the bugs away but should i probably transplant the rest of my plants now? Heres what the bugs look like. What kind of bugs are they and will diatomaceous earth keep them away?
 

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