Coffee Shop Blog

Some grapevine diseases can be identified easily in the field by signs of the pathogen, which include microscopic and macroscopic microbial cells, tissues, and structures. For example, the appearance of the powdery mildew fungus on the surface of infected leaves and...

California winegrape growers with losses due to grapevine red blotch-associated virus (GRBaV), the causative agent of red blotch disease, may be eligible for financial assistance for vine replacement from the U.S. Department of Agriculture’s (USDA) Tree Assistance...

Those of us involved in agriculture are well aware of the increasing concerns about water in California. Even before the current drought, new water regulations were in the works, irrigation district water costs were increasing, and in many locations, access to...

Visual identification of grapevine red blotch associated virus (GRBaV) may be a useful complement to lab testing of tissue samples. While not meant to replace the results from lab tests, visual identification may prove to be a useful method for quickly and cheaply...

California’s historical climate is prone to deep and long-lasting droughts. Even in normal years, most of the precipitation occurs during the winter in the northern, eastern and coastal parts of the state, whereas most of the water demand occurs in the summer in the...

This is the second of a two-part article on bunch rot in winegrapes. Last week's article discussed Botrytis cinerea, including symptoms on various parts of the vine (foliage, canes, berries), the disease's life cycle, recommended management considerations (sanitation,...

Many species of microorganisms may infect grape berries, including fungi and bacteria. Several species of these fungi, including Botrytis cinerea, Aspergillus niger, A. carbonarius, Cladosporium cladosporioides, C. herbarum, Penicillium spp., Rhizopus arrizhus, and...

The American Society of Viticulture and Enology (ASEV) held their 66th national conference in Portland, Oregon on June 15-18. As in the past, I attended this year’s conference as a representative of the Lodi Winegrape Commission and Lodi’s 750 growers. While there I...