two itemtemplates for one listbox

I've got a class FruitViewModel. It describes ViewModels for ListBox items.

<ListBox ItemsSource="{Binding Fruits}">

And I've got

class BananaViewModel : FruitViewModel

and

class AppleViewModel : FruitViewModel

Fruits contains BananaViewModels and AppleViewModels which is bound to ItemsSource.

How can I make different templates for apples and bananas? They should be in one list but have different templates