Hugh, your response about the heat of a bushfire being necessary to either kill the existing plants and/or trigger sufficient germination in Lantana and other species, and a prescribed burn not generating enough heat, is a common observation by people involved in bush regeneration work. With Lantana I have observed a combination of herbicide/prescribed burn/follow-up herbicide being used to help the fire to do its job.
Is anyone aware of instances where prescribed fire has been intensive enough to successfully reduce weed density such that follow up herbicide application of existing parent plants can be minimised, and concentrated on seedlings that have germinated post-burn?
