Search results
Results from the WOW.Com Content Network
Cryphonectria parasitica is a parasitic fungus of chestnut trees. This disease came to be known as chestnut blight.Naturally found in South East Asia, accidental introductions led to invasive populations of C. parasitica in North America and Europe.
Young tree in natural habitat American chestnut male (pollen) catkins. Castanea dentata is a rapidly-growing, large, deciduous hardwood eudicot tree. [20] A singular specimen manifest in Maine has attained a height of 115 feet (35 m) [21] Pre-blight sources give a maximum height of 100 feet (30 m), and a maximum circumference of 13 feet (4.0 m). [22]
According to [(Murr) (And.et And.)] Chestnut blight was first discovered in North America in 1904 on Castanea dentata. By the 1940s it had killed most wild American chestnut trees, which were formerly one of the most abundant species in the eastern U.S. The infection takes place through bark wounds.
Struck by a blight identified in 1904, American chestnut trees are considered "functionally extinct." Now those that remain are facing a new disease.
The American chestnut tree used to grow throughout the eastern U.S., but was devastated by a blight in the early 20th century.
The American chestnut, virtually eliminated from eastern forests, survived in small isolated pockets. Some survivors have been cross-bred with the blight-resistant Chinese chestnut and introduced into National Forests in trial studies. [11] Parasitoid wasps have been approved for release by the USDA to combat the emerald ash borer. Pesticide ...
An estimated 3 billion to 6 billion American chestnut trees once covered forests spreading from southern Mississippi to central Maine. How Genetic Engineering Can Save the Iconic American Chestnut ...
The chestnut blight was introduced in the late 19th century with the Japanese chestnut and decimated the once-widespread American chestnut tree. [9] Native un-modified trees are killed from the ground up by the blight, and only the root system survives.