February 2022 - 14

Clemson scientist studies 'vaccine' for peach trees
By Clemson University
The South Carolina peach industry is a
major contributor to the state's economy
and the fruit is a favorite for many
people, but a devastating fungus is a
constant threat to this jewel of the South.
The honey fungus (Armillaria
tabescens) causes armillaria root rot,
also known as oak root rot. There are
no controls for this disease, which costs
farmers millions of dollars each year in
crop losses.
Some Clemson University scientists
are studying this fungus to help South
Carolina peach growers grow more
profitable crops. The latest study is led
by Sachin Rustgi, an assistant professor
of molecular breeding at the Clemson
Pee Dee Research and Education Center
(REC) in Florence.
Rustgi has received a grant from
the South Carolina Department of
Agriculture to develop management
strategies for armillaria root rot. This
study involves a two-pronged approach,
including " vaccinating " peach trees
with the tomato yellow leaf curl virus.
The virus used for this study has been
modified so that it does not cause
disease and
replicates as
it spreads
throughout
host plants.
" During
our study, we
propose to
modify the
tomato yellow
leaf curl virus
by installing
a piece of armillaria root rot resistantpathogen
that will produce copies as the
virus replicates, " Rustgi said. " This will
function somewhat like a vaccine on the
fungus. We believe this will help stop
the spread of the fungus and help make
the host plant resistant to armillaria
root rot. "
In addition to " vaccinating " host
SACHIN RUSTGI
plants, the study also involves treating
surrounding soil with double-stranded
RNA (dsRNA) to target the armillaria
root rot. Results of the tests will be
available to growers at meetings and
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February 2022

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