Webster County Iowa State University Extension office will hold a vineyard disease control and crop planning workshop from 9 a.m. to noon, on Saturday, at 217 South 25th St., Fort Dodge.
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 diseases, when they occur, and chemical treatments.
Crop planning is an important management practice in grape production, Domoto said.
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 involves 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 (515) 576-2119