Forecasting blooming date based on developmental rate of the ecodormancy stage in 'Kawazu-zakura' (Prunus lannesiana Wils. 'Kawazu-zakura') cherry trees

The developmental index (DVI) was calculated based on the developmental rate (DVR) of endodormancy in Kawazu-zakura (Prunus lannesiana Wils. 'Kawazu-zakura') cherry trees. We developed to forecast the blooming period model based on the calculated DVI. The blooming date and fallen blossom date could be forecast according to the model considering the expected temperatures. The define error for the blooming dates is about 4 days, and then the forecasting of the flower bud stage is when the green seems to begin to crack. The error becomes smaller as the forecast advances with the growth of the floral bud. The treatment of the developed model in this study was easy. Therefore, it was expected to be useful to promote sightseeing.