Sorry, but not an FMA product or used for agricultural purposes.
Well, gone through all the South American aircraft I can find, and cannot see anything that matches.
Frustrating when this occurs so here's a host of clues...
The test pilot was the famous American Orthon (later changed his name to Orton) Hoover who spent most of his life in
Brazil.
It was started off as a test-bed for a new type of plywood based on
Brazilian pine which was 20 per cent stronger than spruce.
The company behind this project were the
Instituto de Pesquisas Technologicas or
IPT. From what I've read the name of the aircraft translates to "Little Bug" but I've seen three slightly different English spellings of it.
Four were eventually built but none were exactly the same and the prototype was registered PP-THH. The "surviving" example is PP-ECM.