All the following is correct about mycorrhizae, except:

Mycorrhizae is a mutual relationship between fungi and roots of higher plant. Both benefit from each other. In it, the fungus colonises the root system of the host plant either intracellularly or extracellularly. The fungal group is known to absorb phosphorus from soil and pass it to the host plant. Such associations also provide other benefits like resistance to root-borne pathogens, tolerance to salinity and drought. Although, this symbiosis provides no protection from insect invasion.