Search results
Results from the WOW.Com Content Network
Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by elm bark beetles. Believed to be originally native to Asia , the disease was accidentally introduced into America , Europe , and New Zealand .
Dutch elm disease Ophiostoma ulmi = Ceratocystis ulmi. Pesotum ulmi [anamorph] = Graphium ulmi Ophiostoma novo-ulmi. Leaf blister Taphrina ulmi: Mistletoe (infection) Phoradendron serotinum = Phoradendron flavescens. Phoradendron tomentosum Viscum album. Nectria canker Nectria spp. Nectria cinnabarina Tubercularia vulgaris [anamorph] Nectria ...
Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures, but it is affected by Dutch elm disease.
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.
Elm phloem necrosis (elm yellows) is a disease of elm trees that is spread by leafhoppers or by root grafts. [20] This very aggressive disease, with no known cure, occurs in the Eastern United States, southern Ontario in Canada, and Europe. It is caused by phytoplasmas that infect the phloem (inner bark) of the tree. [21]
Elm yellows is a plant disease of elm trees that is spread by leafhoppers or by root grafts. [1] Elm yellows, also known as elm phloem necrosis, is very aggressive, with no known cure. Elm yellows occurs in the eastern United States, and southern Ontario in Canada. It is caused by phytoplasmas which infect the phloem (inner bark) of the tree. [2]
'Brandon' is highly susceptible to Dutch Elm Disease. The species as a whole is susceptible to Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola, [4] [5] and highly preferred for feeding by the Japanese Beetle Popillia japonica [6] [7] [8] in the United States.
At the end of 1926, funds were granted for further research into the cause of Dutch elm disease. Buisman was charged with this two-year project, and part of the villa garden was duly planted with elm seedlings. To infect so many plants, Buisman experimented with the use of a syringe, a method which would be used in successive decades.