Entries tagged with: Late Blight

Late blight found in Michigan’s St. Joseph County

Late blight was found in three more potato fields in Michigan’s St. Joseph County on Monday, July 25.            Photo 1. Sporulating late blight lesion with white, velvety mycelial growth. Initial genotyping confirmed isolates as US-23 by GPI isomerase testing. Mating type and Ridomil sensitivity are underway. The source of the inoculum is volunteer potato plants in a sweet corn field (Photo 3). Recommendations for late blight treatment remain the same as…  » Read more

Late blight spreads in Columbia Basin

Washington State University (WSU) Extension has released a special issue of Potato Pest Alert regarding the spread of late blight to more fields in the Columbia Basin. Dennis Johnson, WSU professor and Extension plant pathologist, reported the following information in the alert. Late blight has spread and is extensively present in fields near Burbank, northeast of Pasco, north of Pasco, and north to Eltopia. The strain of the late blight pathogen in the Basin this year is US8, which…  » Read more

Late blight found in Michigan’s Branch County

Late blight was found in a potato plant near Bronson, Michigan, in Branch County on July 5, 2016 (Photos 1-2). Initial genotyping confirmed isolates as US-23 by GPI isomerase testing. Mating type and Ridomil sensitivity are underway.               Photo 1-2 (l-r): Sporulating late blight lesion with white, velvety mycelial growth.                 Expanding brown to black lesions in the lower plant canopy. The source of…  » Read more

Washington state late blight strain identified

Dennis Johnson, Washington State University plant pathologist, said that the late blight reported in Washington state last week has been identified as the US8 strain, which is mefenoxam and metalaxyl resistant. The strain was found in Walla Walla County near Burbank, Washington. US 8 and US 23 were both present in the Columbia Basin last year.  Temperatures are moderating and the expected mild conditions in the Basin will favor heavy sporulation. Rain, cloudy conditions, and frequent sprinkler…  » Read more

Late blight found in Washington state

Late blight has been confirmed in Walla Walla County near Burbank, Washington according to a Washington State University (WSU) potato pest alert report by Dennis Johnson, WSU plant pathologist. “This is the earliest we have had late blight in the Columbia Basin,” Johnson said in this WSU Potato Pest Alert. Johnson recommends that sprinkler irrigated fields in the Burbank, Finley and north Pasco areas should be treated with a late blight fungicide on a 7-day…  » Read more

GM potato approved for field trials

The Department for Environment, Food & Rural Affairs in the U.K. have approved The Sainsbury Laboratory, Norwich’s (TSL) application to conduct field trials of genetically modified potato crops on a designated trial site at the Norwich Research Park between 2016 and 2019. The field trials are part of TSL’s Potato Partnership Project to develop a Maris Piper potato that is blight and nematode resistant, bruises less and produces less acrylamide when cooked at high temperatures. The project…  » Read more

MSU website estimates tuber survival

The Late Bight Risk Forecasting website, used for estimating potential survival of potato volunteers in Michigan, is now available for 2016 risk estimation. Epidemics of potato late blight are initiated from mycelium of Phytophthora infestans, which survives between successive growing seasons by overwintering in infected potato tubers intended for seed, as volunteer tubers left in fields at harvest or within discarded cull and rock piles. It is difficult to estimate the probability that infected potato stems will emerge…  » Read more

Late blight verified in Pasco area

On the Washington State University (WSU) Potato Pest Alert website Carrie Wohleb, WSU Extension educator, reports that late blight has been verified near Pasco, in Block 1 and Block 15. At this time the late blight genotype has not been identified. More late blight samples are needed to identify the genotype. Contact Dennis Johnson at 509-335-3753 or dajohn@wsu.edu to report, confirm or make a late blight diagnosis.

Late blight reported in Wisconsin

On June 23, 2015 late blight was confirmed in a commercial potato field in northern Adams County in Wisconsin. According to Amanda Gevens, University of Wisconsin-Madison assistant professor and Extension vegetable plant pathologist,  the field was at 40 percent emergence and the disease appeared to have been initiated by seedborne inoculum. For more information visit this website.

Late blight recommendations for 2015

Late blight has not been reported to date in Michigan but conditions remain conducive for late blight development according to a report released by Willie Kirk, Michigan State University associate professor of plant pathology and Extension specialist for potatoes and Noah Rosenzweig, Michigan State University associate professor. For more information on late blight conditions and effective management utilizing an integrated disease management approach visit this website. 

Syngenta continues late blight hotline for 2015

Syngenta is continuing its partnership with five universities to provide potato growers with the latest late blight disease updates in 2015. Updates from the five universities are available at the following telephone numbers: University of Idaho: 800-791-7195 Michigan State University: 888-379-9012 North Dakota State University: 888-482-7286 Oregon State University: 800-705-3377 Washington State University: 800-984-7400

Simplot’s Innate varieties achieve federal milestones

The first two generations of the J.R. Simplot Company’s genetically engineered (GE) Innate potato varieties achieved individual federal milestones.Generation one received a determination of nonregulated status from the USDA’s Animal and Plant Health Inspection Service (APHIS). The APHIS document has been published in the Federal Register on and is available online. The first generation of Simplot’s Innate potatoes includes Russet Burbank, Ranger Russet and Atlantic. The three GE varieties were developed with the following traits:…  » Read more

Idaho late blight continues to spread

Two fields with late blight in Idaho’s Fremont County have been confirmed. This brings the total number of Idaho counties reporting late blight to five, Madison, Bingham, Bonneville and Power counties being the others.             Jeff Miller, president and CEO of Miller Research, recommends protecting green, growing vines with fungicide applications.             If late blight is present in your field, Miller recommends a postharvest application of a phosphorous acid (phosphite) product going into storage at…  » Read more

Late blight continues to spread across eastern Idaho

Late blight continues to move across eastern Idaho potato fields. The first confirmation of late blight was in Bingham County on August 12. Since then, late blight has been confirmed in Bonneville County, Power County and Madison County. Phil Nolte, University of Idaho, Idaho Falls Extension seed potato specialist, said that weather conditions continue to be conducive for the development and spread of late blight. “Seems like every few years we run into the right…  » Read more

Late blight found in Idaho

Late blight was positively identified on a leaf sample brought to the University of Idaho’s Idaho Falls Research and Extension lab. The leaf sample came from Bingham County. Call the University of Idaho’s late blight hotline at 1-800-791-7195 for more information. Watch this space for updates and further information.

Late blight reported in Wisconsin

Late blight has been reported in Wisconsin’s Portage County. The strain is of the US-8 genotype. The US-8 genotype is resistant to mefenoxam/metalaxyl fungicides listed in FRAC Group 4. For more information visit this University of Wisconsin-Madison Extension website.

Toll-free potato blight hotlines

Syngenta, in partnership with five universities, once again will offer toll-free potato blight hotlines during the growing season.             The hotlines consist of researchers providing updates about current potato disease pressures during the growing season in each growing region.             The updates are provided by the following universities and are available at the corresponding phone numbers: University of Idaho: 1-800-791-7195 Michigan State University: 1-888-379-9012 North Dakota State University: 1-888-482-7286 Oregon State University: 1-800-705-3377 Washington State…  » Read more