The yellowing of basil leaves could be an indication of the downy mildew of basil disease. This new destructive disease was first detected in south Florida in 2007 and has since spread to at least 42 states in the United States as well as many countries throughout Europe and Africa. This three-page fact sheet describes downy mildew of basil, including its symptoms and ways to control the disease. Written by Shouan Zhang, Jaimin S. Patel, Zelalem Mersha, Pamela D. Roberts, and Richard Raid, and published by the Plant Pathology Department.
Florida’s deep-water ports are ideal for importing many fruits and vegetables, including tomatoes, by ship from the Caribbean as well as Central and South American production areas. These imports are often strictly regulated for pests, but some pathogens still escape quarantine. This 3-page fact sheet describes a postharvest problem on plum tomatoes that were imported from Mexico through South Florida in 2010. Alternaria sp. was isolated from lesions on diseased fruits, pathogenicity tests were conducted on healthy fruits, and symptoms identical to the originally submitted samples were developed. Written by Zelalem Mersha, Shouan Zhang,and Jerry A. Bartz, and published by the UF Department of Plant Pathology, January 2013.