Dad urges locals to leave out protein bars for his autistic son who vanished ...

The desperate search to find William Wall (pictured) continues after he didn't return home

The desperate search to find William Wall (pictured) continues after he didn't return home

The emotional father of an autistic boy who went missing in dense bushland has asked locals to leave out protein bars and revealed how to gain his trust.

William Wall, 14, was last seen heading out for his daily jog along the Yarra Ranges' Warburton Trail at 6.45am on Tuesday, promising his family he would be back in 15 minutes.

But he never returned to his home in Launching Place.

More than 24-hours after his disappearance, hundreds of police and State Emergency Service volunteers are still prowling the bush in search of him.

William's distraught father Shane issued an emotional plea and told locals who have offered to help that the high-functioning autistic teen will stay away from junk food.

'He doesn't like junk food, he prefers protein bars and fruit, that type of thing, he would go for that and it would be like catching a rat in a trap, not a problem,' he told reporters on Wednesday. 

He advised people to remain calm if they do see William and tell him that his 'mum wants to talk to him'.

Bush Search and Rescue Victoria volunteers prepare to depart the Warburton Police station ahead of the search for missing autistic boy William Wall

Bush Search and Rescue Victoria volunteers prepare to depart the Warburton Police station ahead of the search for missing autistic boy William Wall

William's distraught father Shane issued an emotional plea and told locals who have offered to help that the high-functioning autistic teen will stay away from junk food

William's distraught father Shane issued an emotional plea and told locals who have offered to help that the high-functioning autistic teen will stay away from junk food

'Probably responds a bit better than coming to me in most cases, but just call him Will or William either way - he doesn't respond to Bill,' the distraught father said.

'Just in a calm voice tell him "we have got health food bars for you mate, they're yours, come and get them and we want you home".'

Mr Wall struggled to fight back tears as he thanked volunteers, police, the SES and family members who had been searching all night.

'I just want everyone to be safe,' he said.

'I never want to be in this situation but the people around here are fantastic. I mean, I've been in the valley for a long time and come from overseas but this has just blown me away.'

'Actual support from local people, the Facebook community and the noticeboards and that, fantastic. Top notch and the police and SES, again, it has been great.'

'I have hardly spoken to my wife much but they are liaising with them to look after her and I'm out helping where I can.' 

William has a ten-year-old sister named Sophie, and two older brothers Jake, 17, and Harrison, 20, who have been out all night.

With the search taking more than 24-hours, Mr Wall says his son is a 'pretty hardcore' 14-year-old, who usually runs up to 30km.  

Mr Wall struggled to fight back tears as he thanked volunteers, police, the SES and family members who had been searching all night

Mr Wall struggled to fight back tears as he

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