Report on the Agricultural Experiment Stations, 1952 Page: 55
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REDUCING LOSSES FROM PLANT DISEASES 55
plants. However, at soil temperatures below 78 the severity of wilt
was pronounced over a considerable range, indicating that the wilt
fungus was most damaging in its action at the cooler soil temperatures.
Verticillium wilt of potato
The prevalence of Verticillium in Connecticut potatoes which
showed stem end discoloration was definitely shown by isolating the
organism and inoculating it into seed potatoes. According to the
Connecticut Agricultural Experiment Station, there was considerable
wilt in potato fields in 1951, much of which was due to Verticilliulm.
When isolates were compared with Verticillium recovered from Mainegrown
potatoes, they were distinctly different, suggesting that the
Connecticut Verticilliumn is not carried by Maine seed potatoes but
comes from races of Verticillium living in Connecticut soils. As a
practical result, Connecticut growers are being advised to practice
crop rotation and to use nonsusceptible host plants.
The Idaho station found that potato varieties reacted differently
to verticillium wilt, a disease that has recently become prevalent in
certain potato-growing areas. Yields ranging from 554 sacks per acre
were obtained for a resistant variety, as compared with 174 sacks for
a susceptible variety. The most resistant varieties were Katahdin and
Seedling 41956 and their relatives, and selections of Jubel and other
Concentrate sprays effective
The use of concentrate fungicide sprays for the control of various
diseases is receiving a great deal of attention from numerous experiment
station workers. Just how concentrated a spray can be and
still be effective has not been determined satisfactorily. If concentrate
sprays prove to be efficient, they will do much to reduce the cost
of applications. Experiments by the New York (Cornell) station are
helping to shed light on this problem. Applications of 2X or double
the usual strength of bordeaux mixture, Dithane D-14 plus zinc sulfate,
and Crag 658 at the rate of 50 to 60 gallons per acre, controlled
late blight and gave as high yields of potatoes as did the IX concentration
of these fungicides in 100 to 200 gallons of water per acre.
However, unsatisfactory control of late blight was obtained with a
Research at the Maryland station has shown that the reason why
the pox disease of sweetpotato cannot always be controlled by treating
the soil with sulfur is that the fungus has an acid-tolerant strain that
does not react to the usual sulfur treatment. It was also found that
the cracking of sweetpotato roots may be due in part to the prevalence
The Virginia station obtained evidence that cracking of sweetpotatoes
is associated with nematodes. Treating the soil with a
nematicide reduced this cracking from 51 percent in the nontreated
to 15 percent in the treated plot. A sprout decay of sweetpotatoes, of
unknown cause, which destroyed from 20 to 25 percent of the sprouts,
was eliminated by the addition of superphosphate, according to reports
by the New Jersey station.
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United States. Office of Experiment Stations. Report on the Agricultural Experiment Stations, 1952, book, January 1953; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc5990/m1/57/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.