Untrellised vines have which combination of benefits and detriments?

• A. Easily mechanized and produces very high yields.
• B. Keeps canopy always open and airy.
• C. Always requires heavy pruning.
• D. Simple and inexpensive, provides shade; not possible to mechanize, canopy can become too dense.

Answer: (D)

Untrellised vines are grown without a supporting trellis, so the vines spread and are managed with minimal infrastructure. This makes the system simple and inexpensive because there’s no investment in trellis materials or complex training. The growth tends to create a shaded canopy, which can protect grapes from sunburn and reduces heat stress, but it also limits light reaching the fruiting zone and slows air movement, raising the risk of humidity-related diseases. Since there’s no fixed structure to support pruning or harvesting machinery, mechanization is not practical. The dense, sprawling growth can lead to overly dense canopies unless actively managed. This combination—low cost and simplicity, shading, lack of mechanization, and potential dense canopy—fits the described scenario.