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Early Blight in Potato

Early blight of potato is caused by the fungal pathogen Alternaria solani. The disease affects leaves, stems and tubers and can reduce yield, tuber size, storability of tubers, quality of fresh-market and processing tubers and marketability of the crop.

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Fertilizing Potato in North Dakota

The previous edition provided a nutrient rate to potato regardless of varietal efficiency nad harvest date. This edition provides this updated information and also recommendation potassium based in part on soil clay chemistry.

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Late Blight in Potato

Late blight is caused by the funguslike oomycete pathogen Phytophthora infestans. This potentially devastating disease can infect potato foliage and tubers at any stage of crop development.

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Managing Lenticel Spot on potato tubers

Lenticels in potato tubers are an unsightly blemish. These blemishes may reduce marketability of tubers and be an entry point for pathogens. Learn about how lenticel spot is caused and tips on managing this disorder.

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North Dakota Fresh Market Potato Cultivar/Selection Trial Results for 2020

Potato cultivars or selections included in this report were selected from recently released cultivars, advancing selections with release potential (numbered lines progressing through the trial process), or cultivars that are new to the U.S. Standard potato cultivars used by growers served as checks. The agronomic data presented in Tables 1 and 2 were analyzed statistically. These analyses allow the reader to ascertain, at a predetermined level of confidence, if the differences observed among cultivars/selections are reliable, or if they might be due to error inherent in the experimental process.

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Potato Tuber Second Growth

The term secondary growth is often described as heat sprouts, tuber chaining and tuber malformations. This physiological disorder decreases yield and quality of all potato tubers. Good management and varietal selection can minimize this.

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Potato Tuber Viruses: Mop-top Management

The Potato mop-top virus causes tuber quality problems. Infection on tubers may be expressed as arcs or rings on the tuber surface, deep cracking and distortions to the skin that compromising tuber quality. Care must be taken not to infest fields with PMTV from known powdery scab and PMTV infected fields. Additionally, avoiding PMTV or powdery scab-infected seed tubers and using cultivars that are insensitive to mop-top can help prevent this problem.

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Powdery Scab of Potatoes

Spongospora subterranea f. sp. subterranea (referred to as S. subterranea), the causal agent of powdery scab and root gall formation in potato, is a soil- and tuber-borne funguslike pathogen. S. subterranea first was reported in the U.S. in 1913. During this same year, the disease was found established in potato-growing states such as Maine, Florida, Minnesota and Oregon. To date, the pathogen can be found causing disease throughout the U.S., as well as several other potato-growing regions around the world.

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Tobacco Rattle Virus in Potato

Tobacco rattle virus (TRV) causes the economically important corky ring spot (CRS) disease in potato. Tobacco rattle virus is transmitted in the filed by soil-inhabiting stuffy root nematodes of the genera Trichodorus and Paratrichodorus.

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