For vintners, grapegrowers and hospitality professionals across the valley, rows of tightly manicured grapevines translate to a multimillion-dollar wine industry and, ultimately, their livelihoods. For invasive pests, the same vines amount to nothing more than an quick snack. This harsh truth has caused local agricultural officials to mount an all-out offensive against such pests - one fought in the field, as well as in the hearts and minds of valley residents. Greg Clark, Napa's assistant agricultural commissioner, notes recent efforts against the European grapevine moth have made strides toward uprooting the bug permanently.