Use tall barrier crops, windbreaks and bare land
to reduce the numbers of aphids entering the
crop. Aphids landing on plants in windbreaks
and barrier crops can lose the virus from their
mouthparts before they move on, or they may
remain trapped in the barrier plants and not move
into the virus-susceptible crop. Bare land without
weeds and volunteer crops between plantings can
reduce the numbers of aphids entering a crop.
A distance of about 25 m is useful, but larger
distances are more effective.