Pests and Diseases

Different strain behind Idaho late blight

Testing has confirmed late blight infections in Idaho’s 2014 potato crop were caused by a different strain of the fungal pathogen than past significant outbreaks. Researchers say the shift likely poses no immediate threat to Idaho growers — and potentially affords them a new chemical control option — but could eventually lead to challenges. Last season, US23, the major strain[Read[Read More…]

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Australia: Proving potatoes are pest free

A certificate scheme has been developed to prove seed potatoes are free from the pest potato cyst nematode (PCN) after regulatory changes now require seed potatoes to be tested and free from PCN prior to movement across state borders. The  Department of Primary Industries (DPI) developed the scheme which allows approved sampling officers to certify PCN-free seed potatoes.Source: on[Read[Read More…]

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UK: Potato virus warning in home-saved seed

Potential high levels of virus infection in home-saved potato seed means that testing will be crucial ahead of next year’s planting campaign. An early start to the 2014 growing season, coupled with large numbers of the virus-transmitting aphids appearing in young crops, has prompted concerns about high levels of infection being found in seed stocks.Source: on – Global[Read[Read More…]

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Know your nematodes for better control, British farmers told

Potato growers are being urged to identify what species of potato cyst nematode they have in their fields to help tackle the pest. In 2013 potato cyst nematode (PCN) was identified as one of the top five issues facing the UK potato industry, costing in excess of £50m/year. Growers have typically relied on a threshold system to indicate nematode infestation[Read[Read More…]

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Webcast: The nuts and bolts of root lesion nematode on potato

This audio presentation by Dr Ann MacGuidwin, professor at the University of Wisconsin, will help consultants, growers, and other practioners scout and manage root lesion nematodes, the most common nematode pest in most potato fields. The presentation will explain when to be concerned about root lesion nematodes, the interaction of root lesion and Verticillium dahliae for the potato early dying[Read[Read More…]

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Prince Edward Island seed potato shipments to US to be halted

The Canadian Food Inspection Agency (CFIA) sent a letter to USDA’s Animal and Plant Health Inspection Service (APHIS) outlining temporary mitigation efforts in response to the most recent discovery of Potato Wart on Prince Edward Island (PEI) in August. Fresh potatoes from PEI in consumer packs and bulk potatoes for processing or repacking that have been washed and sprout inhibited[Read[Read More…]

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First case of potato wart in three decades discovered in Denmark

The first case of potato wart in three decades was discovered in a field in Ikast in central Jutland last month, and now the authorities are afraid that it may have spread. “We are taking the possibility an outbreak of potato wart, which has not happened in 33 years, very seriously,” Kristine Riskær, the unit head at NaturErhvervstyrelsen, said in[Read[Read More…]

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Fighting potato damaging worms with fungi

The parasitic worm Globodera rostochiensis causes damage to potatoes by spoiling them and rendering them inedible. Scientists have developed a way to stop the worm through the use of fungi as a biological weapon. Globodera rostochiensis is more often known as the golden nematode. More You are unauthorized to view this page.

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US: Eradicating pale cyst nematode is tough going in Idaho

A team of scientists at the University of Idaho is trying to find a way to stop a microscopic parasite that damages potato crops and has now infested 2,400 acres in southeastern Idaho. The U.S. Department of Agriculture announced that the eight-year-old infestation of the pale cyst nematode is up to 22 fields within a 5-mile radius. The fields are[Read[Read More…]

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Scotland: Survey showing freedom from Dickeya maintained

There is good news for the Scottish potato industry following the release of a set of survey results. The 2014 growing season is the fourth consecutive one with no sign of plants infected with Dickeya. This bacterial disease causes blackleg-like symptoms but is much more serious in terms of its effect on crop quality. It is common now in the[Read[Read More…]

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Common virus, pathogen conspire to damage potatoes: PVS breaking down late blight resistance in potatoes

A common potato virus and a fungus-like pathogen can team up to cause even more damage in potatoes. Washington State University scientists found that potato virus S, or PVS, breaks down late blight resistance in potatoes. The discovery will mean that potato breeders will have to take the virus under consideration when developing late-blight-resistant varieties. More You are unauthorized to[Read More…]

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UK: Growers could save money with varieties resistant to late blight

Growers of conventional potatoes could save money by growing late-blight-resistant varieties rather than relying on regular spraying, Sarvari Research Trust director David Shaw said at an open day earlier this month. The trust has recently stepped up efforts to commercialise the Sarpo varieties for which it owns the rights, though chiefly to the home gardener. But Shaw said: “Big growers[Read[Read More…]

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Web seminar focuses on potato fungicide resistance management

Although herbicide-resistant weeds have captured headlines in many trade publications the past few years, another type of resistance is becoming increasingly important – fungicide resistance. In the latest Focus on Potato, Barry Jacobsen, a plant pathology professor at Montana State University, tackles the subject with the potato industry in mind, according to a news release.Source: www.thegrower.comSee on – Potato[Read[Read More…]

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Potato ravaging pest controlled with fungi

Approximately six thousand hectares of Veracruz, in the west coast of Mexico, are dedicated to the production of potato (Solanum tuberosum). During the past 30 years, the fields of the Cofre de Perote area were affected by the presence of the golden nematode (Globodera rostochiensis) reducing performance of the crop by more than 40 percent. Faced with this problem, researchers[Read[Read More…]

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US: Wet, warm weather causes late blight in Teton County

Recently we have seen an influx of a particularly nasty problem in tomatoes and potatoes in home gardens due to the wet and warm weather experienced through August. One of the foremost problems is late blight, which is very damaging and quick to destroy an entire crop. The fungus recently mutated and became more resistant to heat and dry conditions[Read[Read More…]

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Colorado potato beetle management in potatoes

The Colorado potato beetle is the most widespread and destructive insect pest of potato crops in the eastern United States and Canada. Its ability to develop resistance makes it important to continue testing the efficacy of insecticides in the field. Such tests provide data on comparative effectiveness of products and data to help support future registrations and use recommendations..Source: msue.anr.msu.eduSee[Read[Read More…]

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USDA denies renewal of multi-state zebra chip grant

USDA has denied an application by Zebra chip researchers from several Western states to renew a large, five-year grant responsible for several major break-throughs in understanding the potato disease. The expiring $6.9 million grant has aided research by 25-30 crop scientists studying zebra chip, including researchers in Idaho, Washington and Oregon. Charles Rush, a Texas A&M AgriLife researcher who has[Read[Read More…]

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Canada: Late blight confirmed in Alberta

In general, in Alberta, late blight occurs infrequently, but can have devastating impacts in the years when it reaches epidemic levels. As the 2014 season starts to head towards the finish line, late blight has been confirmed in parts of Alberta. “Therefore, it’s recommended that all growers of potato or tomato (commercial or home garden) take specific steps to prevent[Read[Read More…]

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Canada: Late blight strain concern for Prince Edward Island potato farmers

The number of cases of a devastating potato fungus continues to grow on Prince Edward Island. So far, 13 cases of late blight have been confirmed in some potato fields in Freetown, Breadalbane, Summerside, Spring Valley, Wilmot Valley, New Haven, Knutsford and Kensington. It has also been confirmed in tomato plants in the Charlottetown and Brookfield areas. Gary Linkletter is[Read[Read More…]

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Late blight continues spread in Eastern Idaho

Continued wet August weather has caused late blight infections to proliferate throughout Eastern Idaho, according to University of Idaho Extension potato pathologist Phil Nolte. As of Aug. 26, Nolte said eight fields in Fremont, Madison, Bingham, Bonneville and Power counties had confirmed cases of late blight, which thrives in high humidity. Based on reports from crop consultants and field men[Read[Read More…]

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Lukie Pieterse, Editor and Publisher of Potato News Today

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