Fusarium Wilt: A New Threat to Florida Lettuce Production

Pink-brown taproot discoloration caused by Fusarium oxysporum f.sp. lactucae (A). Iceberg field in the Everglades Agricultural Area (EAA) colonized by a wilting disease in the 2017– 2018 season identified as Fusarium wilt of lettuce (B). Credits: Germán Sandoya, UF/IFAS

Fusarium wilt of lettuce is a disease caused by the fungus Fusarium oxysporum f.sp. lactucae. The disease is present in all lettuce production areas worldwide. Recently this disease has been identified in Florida in localized fields. This new 4-page publication of the UF/IFAS Horticultural Sciences Department presents information about the disease, symptoms, and control measures useful to lettuce growers in Florida. Following these recommendations may help to avoid the spread of this fungus in muck soils at the Everglades Agricultural Area (EAA), where 90% of the lettuce in Florida is planted. Written by Germán V. Sandoya, Jesse J. Murray, Richard N. Raid, and Christian F. Miller.
https://edis.ifas.ufl.edu/hs1385

Lettuce Cultivars for Insect Resistance in Southern Florida (HS1196/HS1196)

Russell Nagata, associate professor at the University of Florida's Institute of Food and Agricultural Sciences at Belle Glade, Florida , examines leafminer colonies on romaine lettuce. He is using genetic engineering to make lettuce resistant to the tiny leafminer insect that tunnels through leaves and makes lettuce unmarketable. The improved lettuce will lower pesticide cost for growers and produce higher quility lettuce for consumers. Photography by Milt PutnamFlorida’s subtropical climate facilitates lettuce production from fall through spring, but the warm, moist conditions are also favorable for insect proliferation and damage. Information about current cultivar response to common insect pests in Florida is limited, so UF/IFAS researchers conducted a study to evaluate cultivar response to insect infestation under field conditions and to identify resistance useful for integrated pest management. This 4-page fact sheet was written by Huangjun Lu, Alan L. Wright, and David Sui, and published by the UF Department of Horticultural Sciences, February 2012.
http://edis.ifas.ufl.edu/hs1196

Weeds and Epidemiology of Bacterial Leaf Spot of Lettuce in the Everglades Agricultural Area (SSAGR347/AG357)

This 2-page fact sheet briefly covers the history, symptoms, and epidemiology of this disease of lettuce. Written by D.C. Odero, and published by the UF Department of Agronomy, May 2011.
http://edis.ifas.ufl.edu/ag357