Category Archives: Biology

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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The other 90 (or 95) Percent

We think of ourselves as finely tuned orchestras of cells. We have brain cells to make us smart, liver cells to buffer our indulgences, and immune cells to fight off invaders. These cells are US. They have our uniquely human DNA. … Continue reading

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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

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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

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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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