Monday, May 24, 2010

Gem Fungicide Now Available to Control Citrus Black Spot Disease

New 2(ee) recommendation, latest Bayer solution for beleaguered citrus industry

RESEARCH TRIANGLE PARK, N.C - Bayer CropScience has issued a 2(ee) recommendation in Florida for Gem® fungicide against citrus black spot, a devastating disease that blemishes fruit with hard lesions and reduces yield due to premature fruit drop.

USDA and APHIS scientists confirmed the first U.S. occurrence of the disease in Collier County March 8, 2010. Citrus black spot, caused by Guignardia citricarpa, is reportedly the most significant citrus disease in Brazil, infecting 80 percent of citrus acres. Spores are spread primarily by wind and rain and from infected plant tissue.

Herb Young, fungicide product manager with Bayer CropScience, believes Florida citrus growers have the determination and the tools to manage the disease.

“Our Brazilian colleagues have dealt successfully with citrus black spot for several years,” Young said. “And we know from their experience that Gem is a top performer against this pathogen.”

Young explains that Gem locks into the waxy outer layer of fruit and leaves to form a barrier of protection. Small amounts of moisture create a vapor effect that helps to distribute the active ingredient more consistently throughout the plant canopy for complete and long-lasting protection.

"Waxy citrus cuticle really demands a fungicide that can stay with it,” said Young. “This is a characteristic unique to GEM.”

Under the 2(ee) recommendation, Gem 25WG may be applied at 4 to 8 oz/A with a seasonal limit of 32 ounces. For resistance management, do not make more than four applications of Gem or other strobilurin-class fungicides per season and no more than three sequential applications. Gem may be applied up to 7 days prior to harvest and is also labeled for melanose, scab, greasy spot, Alternaria and post-bloom fruit drop.

Bayer CropScience is committed to supporting the American citrus industry with innovative products and solutions, backed by a knowledgeable and dedicated group of research and technical sales professionals. From exciting new developments to proven and trusted brands, Bayer CropScience strives to protect citrus from start to finish.

For more information on Gem fungicide, talk to your local retailer or visit

Bayer CropScience LP is the U.S. business of Bayer CropScience AG.

About Bayer CropScience
Bayer is a global enterprise with core competencies in the fields of health care, nutrition and high-tech materials. Bayer CropScience AG, a subsidiary of Bayer AG with annual sales of about EUR 6.5 billion (2009), is one of the world’s leading innovative crop science companies in the areas of crop protection, non-agricultural pest control, seeds and traits. The company offers an outstanding range of products and extensive service backup for modern, sustainable agriculture and for non-agricultural applications. Bayer CropScience has a global workforce of 18,700 and is represented in more than 120 countries. This and further news is available at:

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