Researchers Expect Late Blight To Challenge
GREENSBORO, N.C. Late
blight was a significant disease in
many potato-growing regions in
1993. That means growers should
be even more prepared for the dis
ease in 1994, according to re
searchers who attended a recent
Potato Late Blight Symposium in
Portland, Ore., sponsored by Ciba
Plant Protection.
“Since we had a lot of late
blight disease confirmed in 1993,
the inoculum will be there in
1994, said Duane Preston, area
extension agent, potatoes, with the
University of Minnesota and
North Dakota State University,
Grand Forks, N.D. “If the environ
mental conditions favor late
blight, we can expect to see the
disease again.”
For late blight to occur, three
things mi’St be present: the patho
gen (p-V ‘.ophthora), a host plant,
and on" ronmental conditions
conduct. • to disease development
(cool, d»i 4 ip conditions). The host
plant can be in the form of the
growing potato, cull piles, or
volunteer potatoes. There also are
some species of late blight that can
transfer from tomatoes to potatoes
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in areas where both crops are
grown.
Researchers at the meeting
agreed that one of the keys to con
trolling the disease is to follow
good cultural practices, which in
clude;
• Eliminate cull piles and volun
teer potatoes.
• Use resistant or tolerant varie
ties when possible.
• Plant disease-free seed.
• Use crop rotation to reduce
disease pressure.
• Manage irrigation properly.
• Use early preventive fungi
applications.
Fungicides have proven their
effectiveness in the past for con
trol of late blight and storage dis
eases caused by late blight Rido
mil® prepacks, including Ridomil
MZ®, Ridomil/Bravo® and Rido
mil/Copper, along with protectant
fungicides, have been used effec
tively in the past.
Because storage diseases used
to be a greater issue than late
blight in the field, the Ridomil
prepacks were recommended pri
marily for storage rot control.
According to Ciba Phytopatho-
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logy Research Specialist Dr. Bob
by Bassi, that is no longer the
case. Because of the increase in
late blight occurrence, Ciba re
commends early preventive appli
cations of the prepacks.
As many as three applications
of Ridomil prepacks are. recom
mended at 14-day intervals. Tlje
final application should be no later
than row closure (when the potato
plants touch each other within the •
row). The company recommends
that growers then use protectant
fungicides according to their la
bels for the remainder of the sea-
IRISHTOWN (Adams Co.) ganization with 900 family mcm-
The annual spring meeting of the bers. It is affiliated with the Penn-
Adams County Fanners’ Associa- sylvania Fanners* Bureau,
don will be held Tuesday, March "The purpose of the meeting,”
29, at the Mshtown Community according to Co-chairperson Kc-
Firc Hall, according to Larry Fees- vin Holtzingcr, “is to familiarize
er, co-chairperson for the annual the membership with special pro
event grams and business services offer-
The Adams County Farmers’ ed to our members."
Association is a general farm or- Holtzingcr also noted that the
Offer Expires 3-31-94
son. A protectant spray should be
used between the early Ridomil
prepack applications.
This early preventive program
has proven itself effective in Ire
land, where severe late blight in
festations became rampant several
years ago and threatened the entire
potato industry.
Dr. Leslie J. Dowley, head of
plant pathology/entomology, Oak
Park Research Centre, Carlow,
Ireland, relayed the success in Ire
land.
“To effectively control late
blight, we use a Ridomil prepack
Spring Meeting Set
Lancaster Farming, Saturday, March 12, 1994-C3
Potatoes
tor the, first three sprays at inter
vals of 10 days or less,” he said.
“We follow with protectant fungi
cides. This program controls a dis
ease that had threatened our potato
industry. More and more growers
continue to adapt the early preven
tive program, which has helped
the overall industry.”
Growers should rely on local'
extension and university represen
tatives, as well as their agrichemi
cal dealer and sales representa
tives, for recommendations on the
most effective late blight control
program in their area.
membership of the organization
will be voting to rename the group
to the Adams County Fanners’
Bureau during the business ses
sion. He urged all members to be
present
Tickets for the spring meeting,
which includes a family-style din
ner, can be purchased by calling
any board member or committee
Co-chairs Larry Feeser and Kevin
Holtzinger. Reservations arc due
by Match IS to Treasurer Pam
Ketterman.
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