When I did a Food Safety Course the other week they said that we had to be careful about ants getting into the honey processing room because of the germs that they can carry in. So i raised the question of ants getting into the hive and whether they were raiding honey stores and possible contamination. As a result of the ensuing discussion I am going to try and keep them out. One suggestion was to stand the hive stand legs in yoghurt cartons containing engine oil - also preserves the wood as well. I am going to try and coat the base of the legs with something sticky instead.
I had a small willow tree in the garden, I put two sticky bands on the trunk, about 2 inches thick each... a lot of ants did get stuck, but then the rest of them just used the stuck ones for stepping stones. I had to get rid of the tree in the end, the nest in the roots totally undermined it and it toppled over.
I think that standing the legs of a stand in engine oil is worth a try, but the sticky tape thing doesn't work.
dont do the pot of oil thing without putting a larger one above as a rain shield first, i tried it and it does work until it becomes bridge with a leaf ect or washes out so i had a large pot as a cover and a tuna tin with the oil