ISHS Acta Horticulturae 578: International Symposium on Design and Environmental Control of Tropical and Subtropical Greenhouses
CONTROL OF PYTHIUM ROOT ROT OF VEGETABLE PEA SEEDLINGS IN SOILLESS CULTURAL SYSTEM |
| Authors: | Y.S. Lin, Y.H. Gung, J.H. Huang |
| Keywords: | Pisum sativum, Pythium spp., inoculum sources, calcium hypochlorite |
| Abstract:
This study was initiated to develop non-pesticide methods to control Pythium root rot of vegetable pea seedlings in a soilless cultural system. The disease was not prevalent when new seedling trays were used for growing pea seedlings. However, when the seedling trays were used repeatedly for same purpose, active mycelia and oospores of Pythium aphanidermatum and P. ultimum produced by the infected roots contaminated the trays and became an important inoculum source to cause severe root rot. Drying the used trays under sunlight for months or immersing the trays in a calcium hypochlorite solution (2,000 ppm) for 24 hours before planting was effective in preventing this disease. Incidences of the disease were drastically reduced to a level of 0-10% and yields of pea seedlings averaged 772 g/tray when the used trays were pre-treated with calcium hypochlorite solution, whereas the average yield was 212 g/tray for the non-treated controls during hot growing season. | |
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