摘要 : Dieback, or 'dead arm', in noncoastal California (USA) grapevines is most commonly caused by <i>Botryosphaeria</i> spp. Koch's postulates demonstrated that isolates of <i>B. obtusa</i> were pathogenic on grapevines. Studies were c... 展开 Dieback, or 'dead arm', in noncoastal California (USA) grapevines is most commonly caused by <i>Botryosphaeria</i> spp. Koch's postulates demonstrated that isolates of <i>B. obtusa</i> were pathogenic on grapevines. Studies were conducted to investigate the life cycle of <i>B. obtusa</i> and ways to control it with cultural practices. Fungal spores disseminated by rainstorms were collected in traps in a vineyard in Arbuckle from December 2006 through spring 2007. The data suggested that <i>B. obtusa</i> was rain-disseminated through winter and spring, and that pycnidia on deadwood in the vines was a major source of inoculum for new infections. Transmission may also be possible via vegetative propagation, pruning shears and insects. Durable latex paints were investigated for protecting pruning and surgical wounds; a self-priming latex paint was shown to be an effective barrier and was nonphytotoxic. 收起