Iowa State University Webster County Extension and Outreach office will hold a vineyard disease control and crop planning workshop from 9 a.m. to noon Saturday at the Webster County office, 217 S. 25th St. Dr. Paul Domoto will be presenting.
Important diseases that attack grapevines include anthracnose, Phompsis leaf and cane spot, downy mildew, powdery mildew and various bunch rots. Domoto will cover how to identify the diseases, when they occur during the season, pesticides that control them and how to effectively apply the pesticides.
Crop planning is an important management practice in grape production. When grapevines are over-cropped, fruit and wine quality suffer because sugars do not accumulate and acids remain high. Conversely, when grapevines are under-cropped, vegetative growth can be excessive and additional cultural practices are needed to improve fruit quality. Crop planning begins with pruning in the spring to attain a balance between vegetative growth and fruiting. It also involved estimating the potential crop to determine if fruit thinning is necessary to avoid over-cropping and assure optimum quality at harvest. Domoto will cover the various factors that need to be considered in estimating and adjusting the crop load on grapevines.
The cost of the class is $10, and pre-registration is required by calling 576-2119.