However futile the effort may be, trying to define Vergil’s Georgics with just one word often yields the response didactic, because the poem’s four books do contain a considerable amount of didaxis, despite varying degrees of thoroughness and accuracy on the author’s part. At first glance, one of the purest didactic sections of the poem would be Vergil’s description of weather signs, roughly 110 lines near the end of Georgics 1, modeled closely on the last third of Aratus’ Phaenomena—the Diosemeiae—which deals with weather signs and prognostication.
"Vergil’s Eclogues and Georgics: Interpreting Vergil’s Didaxis in the Weather Signs of the First Georgic,"
Colgate Academic Review:
Vol. 2, Article 3.
Available at: http://commons.colgate.edu/car/vol2/iss1/3