US (AR): Table grapes in high tunnels

"At the University of Arkansas, Dr. Elena Garcia is conducting research on growing table grapes in high tunnels. I have seen her present results at two conferences, the last being at the Arkansas/Oklahoma Horticulture Industries Show in January. I find the preliminary results interesting, since table grapes are extremely challenging to grow in the south, even with full spray programs", writes David Redhage, President of the Kerr Center for Sustainable Agriculture.

"Dr. Garcia is using a mix of season modification technologies, insect exclusion techniques, and regionally developed fruit varieties in her work. Netting is used on the roll-up sides of the high tunnels to keep insects out, and the plastic keeps rainfall from wetting the fruit and plant, reducing fungal problems.

"Her research is showing that Arkansas developed table grape varieties (Faith, Hope and Mars) can do very well under high tunnels. In the field, table grapes start commercial yielding in year three, but in the high tunnel, commercial yields start the year after planting. From an economic standpoint, this is very important.

"Yields and fruit quality are higher in the high tunnels compared to field-grown table grapes. Some sprays are still used in the high tunnels, but current research is showing a reduction in sprays. In 2013, only three fungicide sprays were needed in the high tunnel, vs. eight or more in the field. Only two insecticide sprays were used in the high tunnel, vs. four to six in the field, depending on the season.

"Dr. Garcia thinks that with more research, she may be able to grow table grapes organically in Arkansas! She is also positioning this research as beneficial for market growers or CSAs who can charge retail prices for their product."

Read more at the Kerr Center