A New Member of the Clover Proliferation Phytoplasma Group (16SrVI) Associated with Elm Yellows in Illinois

Plant Disease
K A JacobsK D Bottner

Abstract

A disease with symptoms similar to elm yellows (EY) was noticed in the early 1990s in suburban Chicago, IL. More than 1,000 mature American elms (Ulmus americana) have since died. Infected trees varied in the incidence and severity of canopy yellowing, leaf epinasty, butterscotch discoloration, and wintergreen odor of the phloem, but all developed a sparse and clumpy crown, uniformly necrotic phloem, and died within 2 years of showing canopy symptoms. Because symptoms were expressed irregularly and phytoplasma detection results by a commercial diagnostic company were inconsistent, a study was initiated to determine if EY phytoplasma was the causal agent. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) methods using universal or EY phytoplasma specific primers were employed to detect putative phytoplasma(s) associated with 10 trees of varied disease severity within the outbreak region and 10 asymptomatic trees from an uninfected area (controls). Nested PCR using universal primers revealed that 90% of trees from the outbreak region were positive for phytoplasma while asymptomatic elms from another location (controls) tested negative. Phytoplasma-positive trees ranged in disease severity from 1 (asymp...Continue Reading

Citations

Jul 25, 2008·Annual Review of Psychology·Bruce J AvolioTodd J Weber
Jan 26, 2010·International Journal of Systematic and Evolutionary Microbiology·I-M LeeN A Harrison
Feb 8, 2018·Leadership in Health Services·Niina MalilaMarjo Suhonen
Jul 29, 2004·International Journal of Systematic and Evolutionary Microbiology·Chuji Hiruki, Keri Wang
Sep 4, 2007·International Journal of Systematic and Evolutionary Microbiology·M MartiniR Osler
Nov 1, 2010·Plant Disease·Padmini HerathGary W Moorman

❮ Previous
Next ❯

Related Concepts

Related Feeds

Birth Defects

Birth defects encompass structural and functional alterations that occur during embryonic or fetal development and are present since birth. The cause may be genetic, environmental or unknown and can result in physical and/or mental impairment. Here is the latest research on birth defects.