UPDATE: AIRCRAFT are seeking out hot spots within a blue gum plantation as 150 firefighters continue work to control a bushfire near Seymour.

Whiteheads Creek incident control John Liben told Weekly Times Now the fire, which was started by a lightening strike on Saturday night, had burnt 620ha including 250ha within a bluegum plantation.

Strong wind had fanned the blaze over the weekend and Mr Liben said smoke in the area had reduced.

Crews worked through yesterday and into the early hours of this morning to reinforce containment lines.

"Today firefighters are putting out hot spots," Mr Liben said.

"We believe 250ha (of the plantation) has been damaged. It’s a patchy burn and a team will make an assessment today."

A helicopter with infra-red equipment is seeking out hot spots and a water bomber is working in the area.

On the ground, four strike teams of CFA and Department of Sustainability and Environment crews make up 150 firefighters.

"This is indicative of things to come. The grass has dried off and combined with hot wind fire moves rapidly," Mr Liben said.

He said fire risks were already high only 10 days into summer before further areas dried out.

It is hoped the fire will be contained later today.

The CFA today said the fire had burnt 250ha of a blue gum plantation, killed 15 sheep and destroyed 50km of fences.