Page 34 - Grapevine May-June 2020
P. 34
Around The Vineyard
Half of a leafroll-infected vineyard block was
replaced with newly planted material.
Innovation on Sustainable Pest
Management Practices
By: Judit Monis, Ph.D
T his year I attended a session organized by is done by reducing the source of inoculum (i.e.,
rogue infected vines). The practice of rogueing
the Unified Wine and Grape Symposium
on Sustainable Pest Management. The
invited speakers were Marc Fuchs, professor at or removal of infected vines from the vineyard
reduces the amount of virus available to the insect
Cornell University, Steven Lindow, professor at the vectors, therefore reducing the transmission rate.
University of California-Berkeley, and Dr. Michelle Economic studies indicate that removal of individ-
Moyer, extension specialist at the University of ual infected vines must be done if less than 25% of
Washington. Each of the speakers presented an the vineyard block is infected. If there is more than
update on their research which I summarize below a 25% infection, the recommendation is to remove
with some of my own opinions. the entire block.
Sustainable Control of Leafroll Ideally, viral and other diseases would be con-
and Red Blotch Viruses trolled using disease resistance genes present in
the plant. Unfortunately, no natural resistance
Marc Fuchs presented his research on leafroll and to leafroll or red blotch viruses have been found
red blotch viruses. These viruses can cause reve- in commercial or wild grape species. In a proj-
nue reductions as high as $3700/acre. Presently, ect funded by the California PD GWSS Board (PD
the recommended management of these viruses Board) Professor Fuchs’ group has proposed to
Page 32 The Grapevine • May - June 2020 877-892-5332
Grapevine Main Pages GV050620_Layout 1-1 .indd 32 4/28/20 1:21 PM
