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Question 1
Why did Monte Rosso's original vines survive as own-rooted specimens rather than requiring grafting onto resistant American rootstock?
A
The volcanic, rocky, low-clay soils provided insufficient habitat for phylloxera to establish
B
The vines were sprayed continuously with a pesticide from the 1880s onward
C
The high elevation kept temperatures too cold for the vines to be planted until after the epidemic passed
D
The vines were grafted onto resistant rootstock before the epidemic reached California
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