A grape grower is cultivating grapevines in an outdoor vineyard. One of the vines, Vine V, has become infected with a wind-dispersed fungal pathogen.
The diagram below shows the top-down plan of the vineyard layout:
a.[2]
Which vine in the vineyard layout is the fungal disease likely to spread to first from Vine V? Give a reason for your answer.
b.[1]
Suggest one physical action the grower could take to reduce the spread of this fungal disease to the other grapevines, without using chemical fungicides.