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Mouse-Ear Can Be Defeated

Date:
November 26, 2004
Source:
USDA / Agricultural Research Service
Summary:
Pecan growers battling a tree ailment called "mouse-ear" can now rest assured that help is on the way, thanks in part to Agricultural Research Service scientists who discovered that the condition is caused by a nickel deficiency in the plant.

Pecans.
Credit: Photo by Scott Bauer / Courtesy of USDA / Agricultural Research Service

Pecan growers battling a tree ailment called "mouse-ear" can now rest assured that help is on the way, thanks in part to Agricultural Research Service scientists who discovered that the condition is caused by a nickel deficiency in the plant.

The ARS discovery has led to a commercial fertilizer application to control mouse-ear. This growth and development abnormality, recognized as "little-leaf" in other crops, is becoming increasingly common in second-generation pecan orchards where new trees are planted.

Nickel deficiency was pinpointed as the problem by research leader Bruce Wood and plant pathologists Charles Reilly and Andrew Nyczepir at ARS' Southeastern Fruit and Tree Nut Research Laboratory in Byron, Ga.

A foliar fertilizer, called NICKEL PLUS, has been developed by NIPAN, LLC, of Valdosta, Ga. It has been approved by the Georgia Department of Agriculture as a fertilizer nutrient that can correct nickel deficiency problems in pecan and river birch trees. Wood assisted with determining the treatment formulation, which will be available for distribution next spring.

Wood and his colleagues saw there was a lack of nickel uptake by the plants even if there was an abundance of nickel in the soil. Heavy metals such as zinc, manganese, iron, cadmium and copper compete with nickel for uptake channels in the feeder roots of the pecan tree. Additionally, lighter metals such as magnesium also act to indirectly limit nickel uptake. It was found that nickel deficiency had usually been induced by excessive accumulation of other elements due to decades of fertilizer applications.

The severe form of mouse-ear most commonly occurs in the southeastern Georgia sector of the U.S. pecan belt, but is also found throughout much of the Gulf Coast Coastal Plain.

The anomaly first appears on the spring flush of shoots. A severe case of mouse-ear is corrected by a timely foliar application of nickel.

ARS is the USDA's chief scientific research agency.


Story Source:

The above story is based on materials provided by USDA / Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA / Agricultural Research Service. "Mouse-Ear Can Be Defeated." ScienceDaily. ScienceDaily, 26 November 2004. <www.sciencedaily.com/releases/2004/11/041124161620.htm>.
USDA / Agricultural Research Service. (2004, November 26). Mouse-Ear Can Be Defeated. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2004/11/041124161620.htm
USDA / Agricultural Research Service. "Mouse-Ear Can Be Defeated." ScienceDaily. www.sciencedaily.com/releases/2004/11/041124161620.htm (accessed July 28, 2014).

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