It's possible that the bacteria secrete them directly, or allow the leaf-miner to do so.    From Wordnik.com.  [Discover Blogs] Reference

Without exception, every leaf-miner that Kaiser tested, from all over the Loire Valley, carried The bacteria were the true agents behind the green islands.    From Wordnik.com.  [Discover Blogs] Reference

Wolbachia has a gene that's important for the creation of cytokinins, and a paper published four decades ago found large amounts of these hormones in the salivary glands of a leaf-miner.    From Wordnik.com.  [Discover Blogs] Reference

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Wolbachia or a leaf-miner.    From Wordnik.com.  [Discover Blogs] Reference