Chenille-covered twist ties, roughly 5" long (a standard long craft store pipecleaner cut in half), twisted twice. Put them immediately on either side of trunks & trellis poles, then at 6"+- increments along the rest of the length of the rows. Kept them tied above the irrigation line. Even with this level of security, birds got in a couple times, and they definitely learned out to pick off the grapes through the nets - but we're down to only 5-10% loss from birds now.
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