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Falling branches encourage elm bark beetles (Scolytus multistriatus and S. schevyrewi) to proliferate; the beetles are vectors of Dutch elm disease. [4] Elm leaf beetles become active in the spring once temperatures rise above 52 °F (11 °C). In fact, weather is one of the most limiting factors in their population growth.
Monocesta coryli, the larger elm leaf beetle, is a species of skeletonizing leaf beetle in the family Chrysomelidae. It is found in eastern and southeastern North America, from Florida west to Kansas and north to Pennsylvania. It is the only species of the large neotropical genus Monocesta known to be found in the United States.
In Belgium, elm die-back and death was observed in 1836 and 1896 in Brussels, and in 1885–1886 in Ghent. In the later outbreaks the die-back was attributed to the elm bark beetle. [86] It has been suggested that "for thousands of years elms have flourished in natural balance with the scolytidae, combating occasional infections of Dutch elm ...
May 17—New Mexico has had many invaders over the centuries, large, medium and small. The latest is in the latter group: It's a dark, half-inch-long insect with red markings on its belly, known ...
The American Elm cultivar Ulmus americana 'Independence' was raised by Eugene B. Smalley and Donald T. Lester at the University of Wisconsin–Madison from a crossing of the American Elm cultivar Moline and American Elm clone W-185-21, to become one of the six clones forming the American Liberty series, and the only one to be patented (U. S. Plant Patent 6227, 1988).
Stegophora ulmea is a foliar disease of elms commonly known as black spot of elm, twig blight, and elm leaf scab. [1] It is characterized by yellow spots that become black spots on the leaves. The pathogen is an ascomycete fungus native to North America.
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