Table 1

Details of participating peer networking groups.

Group nameTopicsPast and current activities
County-level groupsVit Women (est. ~2005) 200+ membersViticulture farming challenges•    Email-based discussion to provide safe space for female viticulturists to share information, ask advice, and make industry connections.
•    Occasional social events.
Neighborhood Alliance for Vineyard Protection (NAViP) (est. 2018) 30 members regularly attend meetings 154 total members on email listViticulture farming challenges (emphasis on pests and diseases)•    Email-based discussion for members to share information and ask advice; three to five meetings per year.
•    Website (www.navip.org) with interactive map to access publicly sourced vineyard contact details.
•    Facilitates and supports smaller neighborhood groups in Napa County.
•    Group data-sharing projects: powdery mildew spore counts and treehopper girdle monitoring.
Neighborhood groupsRutherford Central (est. 2012) 8 members regularly attend meetings 20 total members on email listMealybugs, Pierce’s disease, Grapevine red blotch disease•    Four to six meetings of 1.5 hr per year. Host speakers for demonstrations and presentations.
•    Primer factsheet on grape mealybug monitoring and management.
•    Coordinated vine and block removal to mitigate leafroll and red blotch diseases.
•    Collaborative male mealybug trapping project to track spread and coordinate pesticide sprays. Data are shared with adjacent neighborhood group.
•    Contact list established for communicating with members.
Jahant Area Vineyard Alliance (JAVA) (est. 2019) 25 members regularly attend meetings 70 total members on email listVine mealybug•    Multiple winter meetings, including hosting invited speakers.
•    Trapping and mapping project: traps monitored and maps created of trap counts and where mating disruption deployed. Data are shared in meetings and via email and short videos (2 to 5 min).
•    Website: www.lodigroweralliance.net
Hillside (est. 2022) 8 membersVine mealybug•    Three online meetings of 50 min per year. Members share practices adopted, geographic extent of mealybug populations, schedules of practices.
•    Contact list created for members to communicate with each other.
•    Exerted collective pressure to have Argentine ant bait approved by organic certification agency.
Oakville West (est. 2022) 5 members regularly attend meetings 12 total members on email listVine mealybug and general viticultural challenges•    Two to three meetings of 1 hr per year are an open forum for sharing ideas and establishing relationships.
•    Email list established for communicating with members.
Rutherford North (est. 2023) (currently inactive)Vine mealybug•    Two meetings in 2023 and 2024 to educate members about control strategies and encourage members to deploy mating disruption for vine mealybug.
Prichard Hill (est. 2024) 20 membersVine mealybug, Grapevine red blotch disease, powdery mildew, wildfire•    Three in-person meetings in first year and a separate online meeting with a guest presenter.
•    Contact list for members to communicate with each other.