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Ontario Crop Production Update August 10, 2019

According to Mark VanOostrum, the harvest of the early processing crop is going well. The yield is average, solids are slightly higher and a little bit of common scab is showing up. I am not surprised to hear about scab this season; common scab is more aggressive in dry years. It appears that the  beneficial bacteria, which compete with scab, suffer more than scab when it is dry. This results in more…

Digging of the Fresh-Market Crop Has Begun Near Leamington, Ont.

Things looked very different across the province from July 22 to 26 depending on the area.  Digging of the fresh-market crop has started near Leamington, Ont. Quality and size look good. Growers are digging the earliest planted fields in the Simcoe-Delhi region, but the area is dry. “Harvest has started for us and the crop looks good. We need some rain because harvesting and irrigating are not a great combination,” said Joe Lach,…

Fine-Tuning Pink Rot Fungicide Timing

Jeff Miller, a researcher with Miller Research in Idaho, will be presenting his latest study on management of pink rot (Phytophthora erythroseptica) at the 2019 Potato Association of America (PAA) annual meeting. This persistent soil-borne disease causes tuber breakdown and yield loss. Miller’s field trial is looking at the effect of the timing interval between spraying a phosphite fungicide for pink rot suppression and applying irrigation water. Miller provides some background information…

Pest Alerts to Help Fight Zebra Chip

In her presentation at the 2019 Potato Association of America Annual Meeting in Winnipeg, Man., Carrie Wohleb, an associate professor and a potato, vegetable and seed crops specialist with Washington State University (WSU) Extension, will be sharing the results from a monitoring network in Washington State that tracks potato psyllids (Bactericera cockerelli). These little flying insects are the vector for Candidatus Liberibacter solanacearum, the bacterium that causes zebra chip disease. Zebra chip was…

PVY Management Strategies that Work

At the 103rd Potato Association of America (PAA) Annual Meeting, Andrei Alyokhin, a professor of Applied Entomology at the University of Maine, talked about his recent studies on the transmission of potato virus Y (PVY), an aphid-borne virus that impacts potatoes worldwide. “PVY is an economically important virus that causes significant crop losses,” he says. Depending on the potato cultivar and the strain of the virus, PVY can cause such symptoms as leaf…

Late Blight Spores found in Ontario Spore Traps

High numbers of late blight spores were found in the filters of the two spore traps placed near Delhi, Ont. This area has received enough rain recently to create favourable conditions for disease development. Keep the crop protected, especially new growth.  It’s the best way to reduce the risk of outbreaks. Some early planted fields are being topkilled in Norfolk County. Tank mixing Reglone with Copper Hydroxide (e.g. Parasol) should ensure that spores…

Ontario Crop Production Update July 19, 2019

The potato crop in southwestern Ontario has benefited enormously from the 1 to 1.5 inches of rain that fell on July 17.  However Alliston, Shelburne and Eastern Ontario continue to be dry. Potatoes are showing signs of stress in the non-irrigated fields, especially leaf burn. According to Ontario Potato Distributing, the first new potatoes from Leamington will arrive at the Alliston packing plant on July 22. Joe Lach reported that a few…

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…

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