Is it too late to treat with Thymovar?

[FidoDido]

I’ve had a few really tough weeks family-wise and as a result I’ve got a bit behind.

I should have treated my colonies sooner but I didn’t. Is it too late?

Also - hive 1 consists of a brood box and one full super on top. If it’s not too late to treat, where does the thymovar strip go?? On top of the brood box or on top of the full super?

 

[Erichalfbee]

It’s a six week treatment with reduced efficacy at temps lower than 15degrees . So is it likely to fall below that where you are?
It goes on top of a double brood but if that’s full of honey I would put it between boxes
I would vape.