Spring Time Symptoms at the Vineyard
Graft Union Infected with Vine Decline Fungi
This year, AL&L Crop Solutions detected a newly described pathogen of grapes, a Botryosphaeria-related fungus, called Neoscytalidium diminatum. The fungus was detected from young vines grown in Sonoma county. Affected vines had shown poor growth, and in some cases the vines had suddenly collapsed. Large cankers were detectable in the trunks of these vines. Neoscytalidium, which also causes disease on walnuts, was found first time on table grapes in Coachella Valley, in 2013.
Pierce’s disease can also be detected by an observant eye during spring. Keeping in mind that the symptoms are not the same as they are in the late season. In spring, vines that had been infected by this bacterium in the previous season, start showing delayed growth and chlorotic leaves.
Some of the viral diseases of grapes can also cause growth delays and the infected vines can be spotted in spring. Leafroll viruses and vitiviruses have been often detected in underperforming vines in spring. Some clients also claim that Red Blotch infected vines had were developing shorter shoots.
Grapevine fanleaf disease infected vine
Early summer will also bring out symptoms of fan leaf and other nepoviruses. Vines infected with these viruses commonly grow leaves with yellow mosaic, or yellow veins, and sometimes leaves may be of abnormal shape. Since many viruses can cause these types of symptoms, spring testing can rule out whether any of these viruses are present.
Young Grapevine Canker
AL&L Crop Solutions Inc.
7769 N. Meridian Rd.
Vacaville, CA 95688, USA
Tel: (530) 387-3270
Fax: (707) 693-3050
Please contact our office anytime to discuss your testing needs and panel options. We are dedicated to providing you with the most accurate results available. Our scientists work one on one with our clients to get personalized and effective results. We look forward to helping you in the future.