| 21. | Stem cankers develop 1 to 3 years after branches die.
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| 22. | Butternut canker was identified as an invasive species in 1967.
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| 23. | Cankers vary in size and appearance depending on their age.
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| 24. | In particular, they have been noted to forage at canker lesions.
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| 25. | Each time a beetle tunnels into a tree a canker is initiated.
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| 26. | Death is by strangulation as a canker encircles and girdles the trunk.
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| 27. | Much of her research involved leaf spots and cankers caused by bacteria.
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| 28. | Since then, however, the citrus canker spread through more residential areas.
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| 29. | The canker's spread varied from year to year, Gast said.
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| 30. | But determining where the canker originated is another issue.
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