San Juan Worm Burgundy - Worm. The Burgundy San Juan Worm was first created to imitate the aquatic worms of the San Juan. The living worms tend to be of neutral colours but time and experience have demonstrated that the trout find an added attraction to the extra little colouring. Trout simply cannot resist this tempting imitation when it is put before them. The Burgundy San Juan Worm has a very natural wormlike wiggle to it, fished in busier waters this fly is guaranteed to fool even the most spooky trout.