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Category Archives: Red Blotch Disease
A Chronology of Red Blotch
The single strand DNA virus shown to be the causative agent in Red Blotch disease of grapevines will almost certainly become a new genus in the family Geminiviridae. Phylogenetic evidence suggests that GRBaV diverged about 250 million years ago before the … Continue reading
Red Blotch Perspective Harvest 2015
The virus seemed different in the vineyard this year. Many vines we had marked as 50% red canopy last year did not meet that threshold this year and some seemed asymptomatic. We began to notice during our vineyard survey last … Continue reading
Further GRBaV Observations
A number of things we have noticed about red blotch did not really fit into the themes of prior posts but we feel bear mention. The first, along the lines of Dr. Golino’s finding of a similar virus in a … Continue reading
Posted in GRBaV, Red Blotch Disease, Wine
Tagged Master Gardeners, Red Blotch, Roger Raiche
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GRBaV, Heredity or Environment?
The burning question in the vineyard business these days is whether or not to rip out and replant Red Blotch infected vines. On the one hand, the first variant of the disease has spread at an average of maybe 4% … Continue reading
GRBaV, The Vector, Which Mite It Be?
At a recent UC extension course, “Current Issues in Vineyard Health”, an impressive group of researchers presented their work. Dr. Brian Bahder revealed evidence of a second variant of GRBaV, commonly called red blotch virus, that seems to have invaded a block … Continue reading
GRBaV, A Null Hypothesis
As one contemplates the panoramas of red vineyards and walks rows to find disturbingly few completely asymptomatic plants, it is easy to consider a null hypothesis suggested by early notions that red blotch has been around a long time masked by similar symptoms … Continue reading
Posted in Biology, GRBaV, Red Blotch Disease, Wine
Tagged Red Blotch, Red Blotch Disease, Red Vein Virus
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GRBaV, An Hypothetical Model for Disease Progression
It’s not like we really have a firm understanding why some plants typically produce brilliant red foliage before dropping their leaves and others do not. It has been suggested that anthrocyanins are produced as a sun screen as chlorophyll is … Continue reading
Virus and Veins
Whether Ebola infects the blood tube walls directly or causes an immune response that damages them, one of the advanced symptoms is leakage of blood from the tubes or vessels. We know even less about the red blotch virus that … Continue reading
Posted in Biology, Extinctions, Microbial Dark Matter, Red Blotch Disease, RGBaV
Tagged Red Blotch, Red Blotch Disease, Red Vein Virus
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Stigma, The Scarlet Letter, and The Red Blotch
In the highly competitive business of marketing wine, consumer perception is everything and nobody wants to admit their vineyards have problems. This fear has slowed research into the habits of a virus now known to cause Red Blotch Disease. It is not such … Continue reading
Posted in Microbial Dark Matter, Red Blotch Disease, RGBaV, Wine
Tagged Scarlet Letter R, Stigma
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GRBaV, The Highway Hypothesis
On our highways fossil energy propels nearly incessant rivers of iron and plastic machines at velocities approaching one hundred feet per second. These machines produce billowing vortices of dust, microbes, micronutrients, and exhaust chemicals in the surrounding atmosphere as they … Continue reading
Posted in Biology, Ecology, Red Blotch Disease, RGBaV, Wine
Tagged GRBaV, Mites, Red Blotch
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