herbicide-free case studies

- CASE STUDY III -

V. SATTUI

Vineyard area:

29 acres

Site Characteristics:

Pleasanton Loam located on flat valley floor. Varietals planted include Alicante Bouchet, Cabernet Sauvignon, Mouvedre, Counoise, Cabernet Franc and Petite Verdot. Blocks vary in row spacing from 7 to 9 feet. Under-row mechanical weed control is the main strategy to regulate weeds at this site.

Tools/Equipment used:

Hand weeding: 1 pass
Clemens: 3 passes (Used mainly for flat ground, with no rocks)
Fischer TWISTER: Used specifically for inclined and rocky terrain

Organic Herbicides?

No

GRAZING?

Yes, we have used Napa Pasture Protein. Cori Carlson is the owner and main contact for sheep grazing.

Tillage?

Yes

Weeds of concern?

Wild Oats, Queen Anne’s Lace, Malva, Filaree

Certification(s):

Napa Green Vineyard
Napa Green Winery
CCOF
Fish Friendly Farming

COSTs:

Weed Management Costs:
Hand weeding w/shovel (on hills & areas where mechanical weeding is not an option) $400/acre/pass x2 passes =$800/acre
Clemens x3 passes =$400/acre
Weed Eater (used specifically for inclined terrain, where Clemens is not an option) =$400/acre
Sheep Grazing =~$1,000/acre
TOTAL: $2,600/acre

One-Time Costs:

Moving up irrigation lines to accommodate TWISTER*: Each metal bracket holding the irrigation line removed, irrigation line moved up, then re-secured with metal bracket again.
Total cost/acre: $600/acre

*If irrigation lines are higher than 24 inches, no issue.