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Potyvirus
Group
-
Potato
Virus
Y
(PVY),
Potato
Virus
A
(PVA)
PVY is also a naked, flexous rod. In combination with PYX it causes rugose mosaic of potato. This disease causes severe damage. The foliage is mottled, severely wrinkled, puckered and markedly reduced in size.
The leaf margins are rolled downwards and the entire plant dwarfed. There is blighting of leaves in severe attacks. PVY is also called Solanum virus 2.
Potato virus A (PVA) (Solanum virus)
3) PVA
in
combination
with
PYX
causes
crinkle
of
potato.
This
disease
closely
resembles
rugose
mosaic
of
potato,
but
is
characterized
by
larger
yellow
patches
on
the
foliage,
which
becomes
brittle
and
easily
injured.
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