You hear a lot of talk about Integrated Pest Management (IMP) in vineyards. So what is IPM? The University of California, Division of Agriculture and Natural Resources (http://www.ipm.ucdavis.edu) 
defines IPM as:
Integrated pest management (IPM) is an ecosystem-based strategy that focuses on long-term prevention of pests or their damage through a combination of techniques such as biological control, habitat manipulation, modification of cultural practices, and use of resistant varieties. Pesticides are used only after monitoring indicates they are needed according to established guidelines, and treatments are made with the goal of removing only the target organism. Pest control materials are selected and applied in a manner that minimizes risks to human health, beneficial and nontarget organisms, and the environment.
SIP Certified Laetitia Vineyard & Winery uses cover crops as a part of their IPM program.