(Picture from Ohio State University http://www.ag.ohio-state.edu/~ohioline/h...
The most notorious is Crown Gall caused by bacteria. Most infections are found near soil level on stems. Check there first.
Open a gall. If you find no insect, then suspect this disease.
To control gall, inspect all plants prior to purchase and make sure you see no hint of disease. Don't plant in an area known to have previous infections of gall. Avoid wounding plants except with pruning. Disinfect all tools regularly as you should already do every year before planting season. You can cut off infected stem parts and toss them out (Do not put into compost). However, most recommend to destroy the whole plant/tree and plant a resistant variety. Once gall sets in on a plant, the soil around it becomes infected too. You can dig up the soil around the infected plants and replace it. You may have to go a foot or two deep (There wasn't any specific info on how deep in my research).
Please be cautious of using chemical pesticides. I'm thinking that an organic fungicide would stem any fungus related gall and insect control would aid the insect related gall. And a bacterial control should aid with the bacterial gall.
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