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3 4 V I N E YA R D & W I N E RY M A N A G E M E N T | M a r - A p r 2 016 w w w. v w m m e d i a . c o m the bilateral cordon training — with and without foliage cross-arms — remains the most popular system in his region, where shade is a ben- efit due to the hot climate. The next most prominent trend in trellising, one that isn't new but remains very popular, is the verti- cal shoot positioned (VSP) trellis. Above the fruiting wire, there are usually up to three sets of perma- nent or moveable shoot positioning wires attached directly to the stake or to a narrow cross-arm attached to the stake. By positioning the shoots vertically, there's more direct sunlight on the grapes and more airflow around the clusters, provided the spurs are well spaced along the cordon. It allows for tight- er spacing between rows as well as increased plant density and produc- tivity per acre. VSP trellis systems are relatively simple to install and are adaptable to many different variety and root- stock combinations, soil types and site aspects. Row and vine spac- ing, fruiting wire height and cano- py height can all vary significantly within the system, and both spur- and cane-pruning techniques can be used, resulting in a wide range of canopy architecture. Another big advantage of the VSP system is that it's adaptable to vineyard mechanization. This system is very popular on California's North Coast. Luke McMullen, vineyard manager for Barbour Vineyards in Napa Val- ley, whose primary responsibilities entail vineyard and irrigation design and installation, shares that approxi- Domestic TRELLISING T O TA L AG S O L U T I O N S Get exactly what you've ordered—to the decimal— with reliable American-made steel trellising. With innovative new products from trusted brands, Central Valley is supplying vineyards in Napa, Sonoma, and Northern California. Find out how we can support your growth with consultation, financing, delivery, and bulk pricing. Talk to an Ag Pro Email us at VMsales@central-valley.com Paul Verdegaal, farm advisor at UC Cooperative Extension in San Joaquin County, has worked for the last 29 years on research trials in vineyard design. SOIL & CELLAR REMI COHEN