Based on recent research in Italy, the grape erineum
mite, a type of eriophyid mite found in vineyards worldwide, was shown to be a vector that can transmit GPGV to healthy grapevines in greenhouse experiments.
These leaves were left for 2 h under direct sunlight to force the mites to leave the erineum
(Waite 1992), the latter being an abnormal felty growth of hairs from the leaf epidermis.
One downside is an increasing presence of erineum mites.
Cuneo observed increases in erineum mites after several years with no sulfur applications.
Insect pests are also very moderate, with only the erineum
mite and aerial phylloxera suggested as problems in the vineyard.