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Late Blight Confirmed in Wisconsin

In the Wisconsin Potato Newsletter,  Amanda Gevens wrote: “Late blight on potato has been confirmed in Wood County this afternoon. We have a sample on campus in UW- Madison Vegetable Pathology and my technician will type this first thing in the morning so that we have an understanding of the clonal lineage (strain),  and likely character and mefenoxam (metalaxy-Ml) resistance status.  Sporulation was present but light on most leaves.  Lesions were quarter sized…

Stress Factors and Management Practices for Sugar End Disorder and Stem-End Chip Defect

SUGAR ENDS AND stem-end chip defect are tuber disorders affecting product quality of processing and chipping potatoes, respectively. The environmental stresses causing the disorders occur during the growing season, but tubers appear asymptomatic until harvest or later in storage. Although there are many similarities between the two disorders, there are also some key differences.  To understand the factors causing sugar ends and stem-end chip defect as well as management practices to reduce…

Sugar End Disorder and Stem-End Chip Defect Stress Factors and Management – A Spud Smart Webinar & Podcast

Sugar ends is a physiological disorder that can occur at a tuber’s bud or stem end. The disorder’s symptoms usually aren’t apparent until the tuber’s exposure to colder temperatures — around 10 C or below. The stress that causes the disorder’s development occurs early in the growing season and may be difficult to determine.   Stem-end chip defect is another serious threat affecting tuber quality for chip potato growers. What are the causes…

Ontario Potato Crop Update

As heat and drought continue across the province, irrigation has been the order of the day.  Many fields are in the tuber setting stage, a stage that requires adequate soil moisture for an optimum tuber set.  Fields with closed rows and vigorous canopies keep the soil cool, which reduces stress.  Potatoes suffer when soils get hot in direct sun.  Many fields still have open canopies, the result of late planting.  Unfortunately, a…

Ontario Late Blight Update June 20

I received a spore trap report for June 17 to June 20. The PCR tests were negative for the Shelburne, Alliston and Simcoe-Delhi, Ont. areas. I also visited one of my on-farm variety trials planted on May 16 in a commercial field. The trial is 300 feet long and 4 rows wide; enough to evaluate 60 varieties.  I was impressed with the crop growth — the plants are very healthy and vigorous.  It…

Summer Checklist for Late Blight

When it comes to late blight, an ounce of prevention is worth a pound of cure. The following is a comprehensive list for the control and management of late blight during the summer.  EARLY SUMMER  • Field scouting  Start your scouting program before the crop emerges. This will allow scouts to become familiar with field characteristics such as low spots and changes in soil texture.  Risky areas that should always be monitored…

Scientists Discover Key Plant Virus-Insect Virus Interaction

By Aaron J. Bouchie Aphids and the plant viruses they transmit cause billions of dollars in crop damage around the world every year. A Cornell-led research team is examining the relationship at the molecular level, which could lead to new methods for controlling the pests. A group led by Michelle Heck, research molecular biologist at the USDA Agricultural Research Service (USDA-ARS) and Boyce Thompson Institute, used recently developed small RNA sequencing techniques to better…

Build Soil Quality and Suppress Soil-Borne Pathogens to Improve Yields Study Concludes

Canadian potato farmers, facing rising production costs and increased pressure from global competitors, are always looking for ways to increase yields. Identifying obstacles limiting potato yields is part of the answer, and was the primary objective of a major five-year research project conducted in New Brunswick, Prince Edward Island and Manitoba, which wrapped up last year. Project partners in the industry-led study included McCain Foods Canada, Agriculture and Agri-Food Canada, Potatoes New…

Spud Smart Webinar: Fighting Common Scab

Common scab is a pervasive threat to some potato-growing regions in Canada. Lesions and cavities on infected tubers can render them unmarketable. Researchers and industry experts are still trying to determine why the pathogen is more prevalent in some fields than others as well as the best methods for fighting the disease. While growers use many different practices to control common scab, none have proven to be totally effective. During this webinar,…

Combatting Common Scab

COMMON SCAB, a bacterial disease that doesn’t affect yields but causes ugly lesions and cavities on infected tubers, which can render them unmarketable, is a pervasive threat in potato-growing areas across Canada.  It has likely been around for as long as people have been growing potatoes, but researchers are still trying to determine why the pathogen is much more common in some fields than others and what the best methods are for…

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