Page 41 - Grapevine JanFeb 2021_REV

Around The Vineyard
Around The Vineyard

gen includes Diaporthe (also known as Phomopsis).
The canker symptoms observed in the sections
of affected cordons or trunks in grapevines may
appear to be similar but caused by unrelated fungal
species, however, the life cycles and mode of infec-
tion may be different.

Black Foot

Species of Campylocarpon, Cylindrocladiella,
Dactylonectria, and Ilyonectria (previously known
as Cylindrocarpon spp.) are the causal agents of this
complex disease. These fungi are soil-born and
most active on compact soils with poor drainage.
Symptoms above ground can be indistinguishable
from young vine/ Esca disease described above.
Additionally, the decline symptoms can be con-
fused with Pierce’s disease, caused by Xylella fas-
tidiosa, a bacterial pathogen.

Sudden Vine Collapse
(previously known as Mystery collapse)

A couple years ago, Lodi growers in California
reported a syndrome in which their vines collapse
and die within a short period of time. In 2011,
while working at STA, we tested vines with similar
symptoms, not just from Lodi, but from California’s Supporting
for Over
Central Valley, and Central Coast vineyards. We Vineyards
detected a combination of fungal pathogens (not 30 Years!
always the same usual suspects) and viruses, name-
ly Grapevine leafroll associated -3 (GLRaV-3) and WE STOCK & SHIP
the Vitivirus Grapevine virus F (GVF). Last year, EVERYTHING YOU’LL NEED!
researchers at the University of California at Davis
with fungal expertise (Dr. Akif Eskalen) and viral Post, Anchors, Wire, Grow Tubes,
expertise (Dr. Maher Al Rwahnih) analyzed symp- Stakes, Training & Tying Supplies,
tomatic vines with this syndrome. The samples Netting, Lugs & Harvest Supplies,
were subjected to high throughput sequencing for Loppers, Pruners, Monofilament,
the discovery of novel viruses and to fungal cul- Scare Products and Much More!
ture diagnostics. The results were similar to those
found in my laboratory: various fungal pathogens Call Us Today
(not consistent in every sample), GLRaV-3, and 315-904-4007
Vitiviruses were detected in the collapsed vines.
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Other Diseases

Species of Armillaria mellea (Oak root fungus),
Phytophthora, and Verticillium are soil-born fungal Finger Lakes Trellis Supply
species capable of causing decline and rots in the 5790 Route 104 Williamson, NY 14589 - sales@fltsupply.com

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