Refer to the figure.
Leaf-cutter ant colonies, which farm fungi for food, are often infested with a specialized parasitic fungus called Escovopsis. Under normal conditions, the ants periodically "weed" their fungal gardens, removing unwanted materials and organisms. The figure illustrates results of an experiment showing what happens to weeding behavior when the ant colony is exposed to water, to Trichoderma (a generalist fungal parasite), and to Escovopsis. What does this figure suggest about the mutualism between leaf-cutter ants and the fungi they farm?

Question

Refer to the figure.
  Leaf-cutter ant colonies, which farm fungi for food, are often infested with a specialized parasitic fungus called Escovopsis. Under normal conditions, the ants periodically "weed" their fungal gardens, removing unwanted materials and organisms. The figure illustrates results of an experiment showing what happens to weeding behavior when the ant colony is exposed to water, to Trichoderma (a generalist fungal parasite), and to Escovopsis. What does this figure suggest about the mutualism between leaf-cutter ants and the fungi they farm?

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The Answer of Refer to the figure.
  Leaf-cutter ant colonies, which farm fungi for food, are often infested with a specialized parasitic fungus called Escovopsis. Under normal conditions, the ants periodically "weed" their fungal gardens, removing unwanted materials and organisms. The figure illustrates results of an experiment showing what happens to weeding behavior when the ant colony is exposed to water, to Trichoderma (a generalist fungal parasite), and to Escovopsis. What does this figure suggest about the mutualism between leaf-cutter ants and the fungi they farm?

Refer to the Figure