From what Ive researched, chemical wise,
AVID is the most effective treatment for this malady, and it cannot be used if they are flowering. Vegging only, ad is gone in 48 days, or less. It is also Devastating to BEE's, and they have enough problems already.
Avid has a 21 day effective treatment period. Broadmites have a 10-12 days breeding cycle.
On other mites/insects ect,
AVID is usually rotated with
Floramite, But FM is Ineffective vs Broadmites. Indoors it is recommended to drive the temps to 115 for 15 minutes, have fans on, really good ventilation, and do this 2x a week, until gone. 115 degrees will kill them. But it usually has to be done repeated several times.
Syngenta is the company name.
They are owned by ChemChina. I don't know if that worse than Monsanto, or not. I just know chemically,
AVID is the most effective treatment, and should be started early, and for preventative vs treatment after infection. Though it will still kill them. Only seems logical to just go ahead, and treat them, vs losing 200 plants.