Sorry to be pedantic, but isn’t it Formosan Not Formusan? Shouldn’t the “u” be changed to an “o”?
By the way, unless you want to purchase your place one day or you plan to live there a long time, just keep using the landlord’s money for a quick fix over and over again. If your landlord doesn’t care enough about their own house to get rid of these wood eaters, then why should you? If it really sucks, maybe ask the landlord for a cheaper price because the termites are eating your furniture, your food and nibbling on your toes at night.
Don’t expect the landlord to pay for the big money but it doesn’t hurt to try. Their thinking is probably more like once they try the cheap method once or twice they will tell you mei ban fa to get rid of them. When you tell them some expert says you can get rid o them but have to spend big money they will either tell you they would have to raise the rent to afford it, or that is a load of BS, their exterminator said it doesn’t work.