Storm-Damaged Trees on Campus Threatened by Dutch Elm Blight
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The KU trees that weathered the storm now have the threat of Dutch Elm disease to look forward to and its all because of the fungus carried by the little elm bark beetles.
Harold Blitch, a supervisor of the KU greenhouse and building and grounds, said Dutch Elm disease usually does not become evident on campus until about June.
THE DISEASE can spread to trees which adjoin each other, he explained, but generally it is caused by fungus transmitted by elm bark beetles who feed on the trees.
Blitch said it is generally believed that the disease is caused by the fungus plugging up the tree cells and thus cutting off the vital sap supply.
However, he said, authorities are now working on the theory that the disease is possibly caused by a toxic substance produced by the fungus.
Blitch said the beetles breed in dead trees. "They are unable to live in a live tree because it is too moist," he explained. He noted that the beetles are also unable to survive in a dead tree if it is more than three years old, because it is too dry.
In such breeding places which are diseased the beetles pick up the fungus.
ursday, May 16, 1963 University Daily Kansan
HE SAID ONE of the reasons for pruning trees is to remove the beetles' breeding places. Spraying kills the beetles and helps to control the disease, he said.
Last year six diseased trees were discovered, he said. They were cut down immediately. Blitch predicted that possibly 15 trees will be striken this year because of the rapid multiplication of the beetles in diseased breeding places.
"The samples usually average seven to eight inches long and three and a fourth inches in diameter," he said.
"When a diseased tree is suspected," said Blitch, "half a dozen samples are taken.
BLITCH SAID the samples are given to bacteriologists who make cultures and conduct three or four tests on them.
"Small chips of wood from the streaked area are sprinkled in a sterile gelatin-like media called agar," he said.
The cultures are kept at controlled temperatures from three to five days, he explained.
Blitch said whether or not the tree is diseased is determined by the fruiting bodies and the characteristic patterns formed by the fungus.
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