Abstract
The ventilation systems composed three types of side vent (roll-up) 'SV', side vent+roof vent 'SV+RV', and side vent+roof fan 'SV+RF' with 7.5 m spacing, with specific set point temperatures for ventilation: SV (<TEX>$35^{\circ}C$</TEX> open / <TEX>$33^{\circ}C$</TEX> close), SV+RV or SV+RH (<TEX>$35^{\circ}C$</TEX> open/<TEX>$33^{\circ}C$</TEX> close for root ventilation and <TEX>$37^{\circ}C$</TEX> open / <TEX>$35^{\circ}C$</TEX> close for side vent). In the treatment of SV+RV, although the average daily maximum temperature inside the greenhouse temporarily increased by <TEX>$38-40^{\circ}C$</TEX>, thermal stress by high temperature did not occur and the disease incidence (%) of powdery mildew and downy mildew on the oriental melon were 25 - 75% lower than in the conventional SV treatment. In the SV treatment, the disease incidence (%) of powdery mildew and downy mildew were 1.4 - 7.7% and 4.2 - 15.9% for 'Deabakkul', and 20.3 - 22.8% and 2.8 - 11.3%, for 'Ildeungkkul'. The yield for one month was higher in the treatment of SV+RV than those in other treatments, with values of 2,105 kg/10a for 'Deabakkul' and 2,537 kg/10a for 'Ildeungkkul'. The simultaneous treatment with side vent and roof vent resulted in 16.2% higher yield (18.1% higher marketable yield) than that in the SV treatment for 'Deabakkul'.
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