Tag Archives: Red Blotch

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

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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

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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

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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

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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

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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

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