One of the species of this genus,
P. viticola, cause a
grape disease called
Phomopsis or
dead-arm. Usually, infections begin during early growth stages in spring. This affects leaves,
fruit,
rachises, and shoots of a
plant. This
disease causes the formation of
lesions on shoots, leaves, and rachises, but also can cause fruit rot. It causes significant economic damage to grape vines. Another
Phomopsis species,
P. juniperovora, infects junipers, and is a particularly important pest of seedlings and juvenile plants in the nursery industry. ==See also==