How do I plug up this hole on bottom sides of garage?

There are bugs coming into the garage. I've already sprayed the edges of the house, sprayed inside perimeter, and mowed/trimmed the lawn, but I think they're still crawling in through these holes on the bottom sides of the garage. (see picture). Trying to keep the house clean before my daughter comes to... show more There are bugs coming into the garage. I've already sprayed the edges of the house, sprayed inside perimeter, and mowed/trimmed the lawn, but I think they're still crawling in through these holes on the bottom sides of the garage. (see picture).

Trying to keep the house clean before my daughter comes to visit.
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