Ants in a weaker hive?

I went out early this morning as it has been so hot the last week in Adelaide, to see how my hive is doing. All merrily buzzing away in and out. But then I noticed a couple of ant superhighways into the hive up the legs. The ants can get bad around here but I keep them out of the house using need oil wiped around entrances. I used your cooking oil idea Jeff, and sprayed avocado oil from my hand pump I use for cooking.
I wondered if it would be harmful to wipe the need oil around the base of the feet? The bees wouldn’t be in contact. I read it’s not harmful to bees but can kill larvae. But larvae are not likely to come in contact with it?
I will keep an eye on the legs and see how the avo oil lasts and maybe get some grease if it seems effective.

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