Grapevine Pinot gris virus spreads in infected vineyards: latent infections have no direct impact on grape production.

Background: Grapevine Pinot gris virus (GPGV) infects grapevines worldwide and causes symptoms such as chlorotic mottling and deformations on leaves, stunted shoots and short panicles, or none of these symptoms if it appears as latent infection. So far, the consequences of GPGV infections for winegrowers are difficult to assess since important information such as plant performance at different GPGV infection levels and symptom expression are not fully clarified.

Methods: In order to investigate the course of GPGV spread, annual visual evaluations and ELISA tests were conducted over 3-4 consecutive years in four GPGV-infected vineyards in southern Germany: GEM, HEC, NIM, and REI.

Physical and Chemical Traits of Grape Varieties Influence Preferences and Performance.

The cuticle-covered surface forms the interface between plant parts, including fruits, and their environment. The physical and chemical properties of fruit surfaces profoundly influence plant-frugivore interactions by shaping the susceptibility and suitability of the host for the attacker. Grapevine (, Vitaceae) serves as one of the various host plants of the spotted wing drosophila, Matsumura (Diptera: Drosophilidae), which is invasive in several parts of the world and can cause major crop losses.

Effects of Variety and Grape Berry Condition of on Preference Behavior and Performance of .

is an invasive fruit pest and represents a potential economic threat to viticulture. After first observations of in Europe in 2008, research mainly focused on the evaluation of the host range and infestation risk for fruit and berry crops. However, the risk assessment of in viticulture has only recently started.