A FIRE that burned about 300 hectares of land in Myola started in a hay truck.
CFA District 20 Commander Bryan Suckling said investigators would examine what caused the blaze more closely today.
"The cause was a hay truck that caught on fire," he said. "Investigators are drilling down how that started but it is suspected it was a brake failure.
"That then created multiple ignition points along McNamara Road."
As well as burning 300 hectares of land, the fire also destroyed the truck, $400,000 worth of farm machinery, crops, fencing and hay bales.
Mr Suckling said Tuesday's fire had the potential to be devastating.
"Given yesterday was fairly benign (fire) conditions, it said a lot about the dryness (of the land)," he said.
"Because the fuels are so dry, (the fire) took of quickly. With more wind it would have been very devastating fire."
Multiple calls at 1.20pm alerted crews to the blaze with more than 30 CFA crews as well as firefighting helicopters and Department of Land Water and Planning teams helped contain and control the fire.
Fire crews are back on site today to continue to black out and monitor the fire scene.
"There is a large amount of work to be done," he said. "The fire's perimeter is safe, we have a containment line most of way around it.
"Because of heavily treed parts (of the fire site), work is being done to ensure trees extinguished and safe. They have the potential to become unsafe and fall down. DELWP is assisting with tree management."
Road closures are still in effect with Barnadown-Myola and McNamara roads currently closed.
"Barndaown-Myola, Grogan, McNamara and Dobie roads have work to be done on them," Mr Suckling said. "Until we can determine trees (along those roads) wont fall down, we won't open them.
"Barndaown-Myola Road is not a heavily trafficked road."
Mr Suckling said fire fighting resources were spread across the state but that local crews continued to provide great responses to fires.
"What we are experiencing on a state level is the resources being drawn to Gippsland," he said. "Normally one (firefighting helicopter) is based at Bendigo and would have responded in minutes.
'But it is deployed in Gippsland, so (the one that helped Myola) came from past Shepparton. When it arrived it did enormous amount of work to bring the fire under control.
"It was also a good response from the DELWP crews as well. It really was a multi-agency effort.
"All our crews, with the activity they have seen had since September, they're exhausted but continue to provide excellent response. Yesterday was a great example of that."