• rust
  • Leaf rust resistance gene Lr21 is present in hard red spring wheat ( Triticum aestivum ) cultivars grown in Minnesota, North Dakota, South Dakota, Manitoba, and Saskatchewan. (apsnet.org)
  • Isolates of Puccinia triticina , the causal organism of wheat leaf rust, with virulence to this gene have not been previously detected in annual virulence surveys in the United States. (apsnet.org)
  • Leaf rust collections from wheat cultivars and germplasm lines with Lr21 at three locations in Minnesota and North Dakota were increased on plants of the leaf rust susceptible wheat Thatcher and the Thatcher line with Lr21 . (apsnet.org)
  • The single uredinial isolates were inoculated to 7- to 8-day-old seedling plants of the set of 19 differential lines that are currently used in the leaf rust virulence surveys (2). (apsnet.org)
  • Previous standardized methods for growing seedling plants, increase of rust isolates, inoculation, incubation, and evaluation of infection types (IT) were used (2). (apsnet.org)
  • P. triticina isolates with virulence to Lr21 are a new threat to wheat production since in 2010 more than 50% of the hard red spring wheat acreage in Minnesota and North Dakota relied on Lr21 for effective resistance to leaf rust. (apsnet.org)
  • Soybean rust symptoms begin as small tan lesions on lower sides of leaves. (plantmanagementnetwork.org)
  • Rust symptoms were observed on soybean plants on Nov. 15, 2004 and kudzu vines ( Pueraria lobata ) on November 16, 2004 in Gadsden Co., FL. (plantmanagementnetwork.org)
  • Approximately 25% of kudzu leaves observed in the roadside frondescence showed rust symptoms. (plantmanagementnetwork.org)
  • To confirm the causal agent of rust disease on soybean and kudzu in Florida, total DNA was extracted from symptomatic plant tissues with the Extract-N-Amp Plant PCR Kit (XNAP, Sigma-Aldrich Co., St. Louis, MO). (plantmanagementnetwork.org)
  • 2). Extractions were performed on excised soybean and kudzu leaf tissue (0.5 cm 2 ) exhibiting sporulating rust pustules. (plantmanagementnetwork.org)