Abstract
Disease development of symptomless strawberry plants infected with G. cingulata (C. gloeosporioides) was investigated, and effects of the capillary watering and rain shelter covered with plastic film on disease spread were examined. Symptomless plants collected from previously infested fields were apparently healthy before planting in nursery beds in April. The symptoms were first appeared on petioles of mother plants and further developed on runners and daughter plants in June. Although disease development was slowed by the rain shelter covered with plastic film, the rain shelter was insufficient to control the disease because daughter plants became gradually infected from diseased mother plants. Disease development of symptomless plants was affected by watering and it was markedly suppressed by capillary watering. Disease development of daughter plants from inoculated mother plants was significantly suppressed by capillary watering and the rain shelter. The fungus was isolated frequently from necrotic runners but rarely from symptomless runners. The isolation frequency of the fungus from runners of plants watered by capillary matting was considerably lower than those watered by sprinkler. Capillary watering and rain shelter were clearly effective for controlling strawberry anthracnose in nursery beds.
