You're right Weedhound, good care is the best preventative measure. Each year outdoors I usually find at least one spot of bud rot. I just remove the infected area and dry it out real good.

Also, feeding (foliar and soil) with a compost tea really helps them to build up a resistance to disease. This may not be the best choice for indoor growing but outdoors, you can saturate everything with the tea and they love it.