When pathogenic fungi are found growing on the roots of grapevines, grape farmers sometimes respond by covering the ground around their vines with plastic sheeting and pumping a gaseous fungicide into the soil. The most important concern of grape farmers who engage in this practice should be that the

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Mycorrhizae are beneficial fungi that form a mutualistic relationship with grapevines, helping them to absorb nutrients and water from the soil. If the fungicide used to treat the pathogenic fungi on the roots also kills off the beneficial mycorrhizal fungi, it could have long-term negative impacts on the health and productivity of the vines. Therefore, grape farmers should be most concerned about this potential outcome when using gaseous fungicides on their vines.

When Pathogenic Fungi Are Found Growing on the Roots of Grapevines