Issue link: https://read.dmtmag.com/i/466321
www.goodfruit.com GOOD FRUIT GROWER MARCH 1, 2015 23
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Concord variety originated in the New England region
where soils are naturally acidic or low pH. Soils in eastern
Washington are alkaline and typically have high pH.
Davenport now suspects that soil depth is also a factor
in Concord chlorosis. "We've studied soil pH extensively
and can't fi nd distinct correlations between chlorosis
and soil pH. We see chlorosis in vineyards with soil pH
of 8.3 in one location and fi nd it again nearby in pH of
7.8," she said.
Treatment
Davenport continues looking for the magic cure that
will solve Concord chlorosis with a single treatment.
She's had success from making two applications of che-
lated iron in the spring. A rate of 34 pounds applied in
May and June can eliminate the chlorosis.
The problem with her treatment recommendation
is that chelated iron is very expensive and costs $4,000
to $6,000 per ton, plus application costs. And, treatment
is needed annually because there is no carryover effect.
Therefore, she recommends only spot treating symptom-
atic vines with chelated iron in the form of Fe-EDDHA
(ethylenediamine-N,N'-bis(2-hydroxyphenyl) acetic acid).
Davenport spoke during the Washington State Grape
Society's annual meeting.
•
PHOTOS COURTESY OF WASHINGTON STATE UNIVERSITY