Are Phosphorous and Phosphoric Acids Equal Phosphorous Sources for Plant Growth? (HS1010/HS254)

Figure 1.  Downy mildew on lettucePhosphorus (P) is one of the 17 elements essential for plant growth and development, and is also a key component in some agrochemicals, such as phosphorous acid. Thus, there are two types of P closely associated with crop production. The similarity of terms such as phosphoric acid and phosphorous acid may create some confusion as to the actual content and efficacy of these products. This 7-page fact sheet explains what phosphorous acid is and examines both its fungicidal activity and nutrient value. Written by Asha M. Brunings, Guodong Liu, Eric H. Simonne, Shouan Zhang, Yuncong Li, and Lawrence E. Datnoff, and published by the UF Department of Horticultural Sciences, March 2012.

PP266 Cucumber Anthracnose in Florida

PP266, a 5-page illustrated fact sheet by Jessica Palenchar, Danielle D. Treadwell, Lawrence E. Datnoff, and Amanda J. Gevens, describes the symptoms, causal organism, disease cycle, and management of cucumber anthracnose in Florida. Includes references. Published by the UF Department of Plant Pathology, May 2009.