the bees will not eat the wood if it has been treated with a clear silicone sealer - that is if the house is unpainted - is your house is natural cedar ?
if so here is the solution
the first thing to do is to clean your siding with M-1 roof cleaner mix it 5 gallons water to 1 gal of m-1
(M-1 can be found in the paint section of depot with the power washers - use only roof cleaner - as m-1 siding wash is not powerfull - if depot does not have it you can order direct at Jomaps Contractor Grade Cleaning Products
use a cheep pump sprayer to apply - i buy the $ 10. one from home depot or lowes - spray it on the siding let sit for apout 45 min
spray water on the house to re-wet it as it dryes - use a 1200 to 1500 psi power washer with a turbo tip to wash the siding down - the M-1 is an acid so it burns off the mold and not bleaches it - once the siding drys out you will notice it looks like new again - after about a week of drying out you can apply silicone with the pump sprayer again - check with building chemical companys in your area - as i buy from a company in atlantic city - what your going to buy in depot of lowes will not give you many years of protection
feel free to contact me with any questions