What is grapevine leafroll disease?
Grapevine leafroll disease (GLD) is one of the most important viral diseases affecting wine, juice, and table grape cultivars, as well as rootstocks. It currently ranks as one of the most important diseases affecting wine grape cultivars, comparable with several fungal diseases (Naidu et al., 2008).
What causes grape leaf curl?
“It’s caused by a related group of a family of viruses. They’re not only complex, they’re diverse, and they vary in the symptoms they cause, even within the groups. It’s a little bit like human influenza viruses.” Researchers so far have described eight different leafroll viruses.
How do you treat leaf roll virus?
Management strategies
- Plant only certified or virus-tested tubers.
- Remove all self-sown potatoes and solanaceous weeds.
- Avoid planting new and seed potato crops near old, ware or processing crops.
- Rogue (remove) infected plants showing virus symptoms from seed potato crops.
Why are my grape leaves wilting?
Disease Cycle Infection occurs through the grape roots, and the fungus migrates up the vascular tissue. Wilt symptoms appear when warmer weather exerts water stress on infected plants whose vascular tissue is plugged with gums, tyloses, and mycelium.
What causes rust spots on grape leaves?
Spores of grapevine leaf rust are spread by wind and rain. The two hosts of grapevine leaf rust are grape (Vitis spp.) and Meliosma myriantha, a tree native to Japan. Urediniospores are produced on grape, which repeatedly infect healthy grape tissue.
What causes potato leaf roll virus?
Potato leafroll occurs worldwide. It is caused by the potato leafroll virus (PLRV) and affects only potato. It causes high yield losses and can be the most devastating virus of potato. It causes a prominent upward rolling of the leaves, and the plants are stunted and have a stiff upright growth (Fig.
How do you control potato leafroll virus?
To thwart potato leafroll virus, use only certified, disease-free, seed tubers. Control volunteer potatoes and pluck out any plants that appear to be infected.