Got pecan disease problems? Seek higher ground

In Southeast Farm Press

By Lenny Wells, University of Georgia pecan specialist

One of the most often over-looked factors I see regarding production problems in pecan is a consideration of the site where the orchard was planted.

Not long ago, I spoke with a grower who had been on a very good fungicide program. His scab control was excellent in most orchards but in a few orchards scab was a problem. As it turns out, most of those orchards in which scab was becoming a problem were smaller orchards of 30 acres or less and surrounded by woods.  The surrounding woods hold moisture in the area and block wind, limiting airflow in the orchard. Sounds too simple to be the source of the problem, but I’ve seen it many times. Continue reading

Pecan scab down this year for Georgia farmers

By Tatyana Phelps, University of Georgia

There will be between 110 and 120 million pounds of pecans harvested this season, University of Georgia Cooperative Extension pecan specialist Lenny Wells estimates, making this year’s Georgia pecan crop the best he’s seen in the last three years.

“In 2013, it was a really wet year,” Wells said. “When we have a really wet year, pecan scab disease is really bad and that puts a lot of stress on the tree. Whatever happens to a tree one year affects it the next year, and sometimes for the next couple of years. This year, the trees seemed to have recovered from that.” Continue reading

Extract from nematodes stops pecan scab

In Southeast Farm Press

by Sharon Durham, USDA

Researchers know that substances produced by bacteria from the guts of entomopathogenic nematodes (ones that infect insects) can suppress certain plant diseases, including pecan scab, the major disease currently limiting productivity and quality of pecan trees in the southeastern United States. But the specific compounds responsible for the suppression have not been previously identified.

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Heavy summer rains opened door for pecan diseases in Georgia

By Clint Thompson, University of Georgia

Heavy rainfall during the summer opened the door to disease and helped to drastically lower individual size and quantity of pecans produced in Georgia this year.

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Wet summer leaves Georgia pecans vulnerable to scab

The last time Tom Stevenson remembers pecan disease being as bad as this year was in 1994, when a tropical storm stalled over south Georgia and dumped record rainfall in 24 hours – deadly flooding followed it.

In the region left swamped, growers were unable to get into orchards to work.

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Nickel, phosphite showing promise for control of pecan scab

By Sharon Durham, USDA/ARS

Abundant pickings of high-quality pecans are only possible if trees escape the devastating disease called “pecan scab.”

Caused by the fungus Fusicladium effusum, scab is the most destructive disease of pecans in the Southeastern United States. When it is severe, most often when rainfall is above average, nut size is reduced, and total crop loss can occur.

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Nickel and Phosphite Help Growers Fight Pecan Scab

From USDA Agricultural Research Service News

Adding nickel and phosphite to an existing fungicide spray regimen may help growers thwart pecan scab, a scourge to pecan growers in Georgia, according to U.S. Department of Agriculture (USDA) scientists.

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