Lindsay Jordan, University of California Cooperative Extension viticulture advisor for Madera, Merced and Mariposa Counties offers these tips for collecting and processing samples of the fruit that best represent your overall crop.
“Because of their very tight bunches, Zinfandel berries are very vulnerable to rot. We have only a short window of time to get them off the vines before they burst open and become infected. With the low price of Zinfandel due to weak demand...
The larger Pacific spider mite, on the other hand, is the main pest mite species in the San Joaquin Valley and may also be the primary pest mite in certain coastal grape-growing areas. It prefers the hotter, dryer part of the season
As the berries here and elsewhere in the San Joaquin Valley take on color and sugar in transitioning from the growth stage to the ripening phase of the season, there is still work to be done in managing the crop between now and harvest.