Grape downy mildew
While all green tissues of the grapevine are susceptible, characteristic ‘oil spots’ on the upper surface of young, actively growing leaves, followed [...] and canes. In spring, oospore germination is triggered when temperatures reach 10°C in the presence of soil moisture, leading to the formation of macrosporangia [...] humidity), the disease is often well-established before it can be visually detected in the field. Leaf symptoms Yellowish to light-green oil spots on the upper