If a disease kills the beech trees in the forest, the chanterelle mushrooms will likely survive but reduce in population size.
Since the mushrooms are found to only live in association with oak and beech trees, the relationship with the trees can be said to be obligatory.
Without the two trees in the forest, the mushroom will likely go extinct.
However, if a disease should kill only the oak trees in the forest, the mushroom would still survive but only in association with the beech tree.
Thus, the population will reduce but survival will likely be sustained.
More on obligate biological associations can be found here:https://brainly.com/question/9236029
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