Short-knotted: nm Viral disease transmitted by small microscopic worms, nematodes which survive at the expense of the vine. For food, the nematode bites the roots and transmits the virus if infected. It lives in the ground, up to more than 1,50 m deep and can survive after uprooting the vines for 4 to 5 years on pieces of roots that have not been removed. The nematode does not move more than 1,50 m away per year. Contamination occurs either from plot to plot ...
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