Bayer sells a product; Bayer 3-in-1 Insect, Disease and Mite Control; which is a spray concentrate of imidacloprid, tebuconazole and cyfluthrin (a miticide). If you plan to mix your own spray from separate formulations of imidacloprid and tebuconazole, they will clearly be chemically compatible but the only way to know if they are physically compatible is to do a compatibility test. Basically, you mix equal amounts of the two components at their spray concentration in a clear jar, shake well, let sit for 5 minutes and then examine to see if you have a homogenous liquid. Any sign of a second phase separating out, such as a separate liquid layer or a solid, means the formulations are incompatible.

A lot of people believe that spraying fungicides has to be done on a regular basis to prevent disease, but insecticides, if they are used at all, should be sprayed only in response to an attack. Mixing your fungicide with your insecticide takes away your options.

Here is a link that might be useful: Bayer 3-in-1 label

You need to check the label and/or MDS on both products It will have a section on mixing with other stuff. There is also an 800 number you can call on the label or packaging. I've called with questions and they are quite responsive and helpful.