What must we do to control the lusts of the flesh and to bear the fruit of the spirit? 

There are two parallel decisions for the Christian person. 1. To crucify the flesh and 2. To choose to walk in step with the Spirit.

Galatians 5:24 Now those who belong to Christ Jesus have crucified the flesh with its passions and desires.  25 If we live by the Spirit, let us also keep in step with the Spirit.