Dvorak, Go Where I Send Thee?

The incorporation of folk forms of expression into works of higher art is an old tradition in Western music, and we find some of that tradition's most famous examples in the music of Antonin Dvorak written after his 1893 visit to America. As usual, the symphonic work is more famous than the chamber, and so String Quartet #12 is overshadowed by its big big brother, Dvorak's 9th Symphony.

Pinning down the exact influences of the folk melodies has been challenging and it seems to me not much definitive has been written on this topic, which has much revolved around the famous theme from the Largo. One influence, however, seems clear to me from the first movement. What do you think?

Dvorak's 9th Symphony: I. Adagio