Effects of rain protected culture on growing period, damage by disease and fruit quality in wild grape (Vitis coignetiae pulliat)
2006
Kamio, S.(Gifu-ken. Research Inst. for Agricultural Sciences in Hilly and Mountainous Areas, Hida (Japan)) | Asano, Y. | Miyamoto, Y.
Cultivated predominantly in Takayama, the wild grape has suffered from a high incidence of disease, and this has destabilized production particularly in old plants. The effects of rain protected on wild grape growing period, incidence of disease and quality of fruit were investigated. The maximum temperature of rain proofed areas was slightly higher than that of open fields for the months of June and July, but no incidence of plant disease such as leaf burn was observed to result from the higher temperature. Though both male and female covered plants were observed to flower one to two days earlier than those in the open fields, the gap in blooming between male and female plants in the protected areas was identical to that in the open fields. Rain protected culture did not impede pollination and yields were high. The covered grapes were much less susceptible to downy mildew and ripe rot, and the amount of marketable grapes turned out to be stable and high. Grapes, which ripen soundly on the vines are rich in sugar content and low in acidity, and thus well suited to the production of full-bodied wine.
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