Leaf roll caused by environmental factors is not a serious
problem, and affected plants should produce a normal crop of
fruit. They will even develop a more normal growth habit if the
weather dries out. Favorable environmental conditions for leaf
roll include high temperatures, drought, and prolonged periods
of wet soil – and we have experienced all of those during the
current growing season. The symptoms often appear when the
plants are carrying a heavy load of fruit. It is common for the
lowest, oldest leaves on susceptible plants show rolling more
than newer leaves higher on the plant.
Leaf Roll Symptom
Leaf roll may also indicate that plants carrying the wilty gene
are suffering from tobacco mosaic virus (TMV). Plants
suffering from TMV usually will show light-and-dark-green
mottling on the leaves in addition to leaf roll. The
mottling may also appear on green fruits. Affected plants may
appear stunted compared to uninfected plants of the same
variety. TMV is very infectious and may be spread by simply
brushing up against plants as you work in the garden. Plants
suspected of virus infection should be pulled from the garden
and sent out with the trash to avoid infecting clean plants.
There is no treatment for virus infections in plants.
The only sure way to confirm that a suspicious-looking tomato
plant is infected with a virus is by virus indexing through a
certified laboratory. This can be expensive, and is really meant
for commercial growers rather than home gardeners. Penn State's
Disease Diagnostic Lab does not perform virus indexing.
Grow your own seedlings
Strawberry patch care