Disease Note

Hosts of the Leaf Spot Fungus Tubakia dryina in Louisiana. G. E. Holcomb and J. P. Jones, Department of Plant Pathology and Crop Physiology, Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803. Plant Dis. 68:251, 1984. Accepted for publication 9 December 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-251b.

Tubakia dryina (Sacc.) Sutt. (= Actinopelte dryina (Sacc.) Hoehn.) commonly causes leaf spots on species of oak in Louisiana.  Disease caused by T. dryina was found on the following members of the Fagaceae family: Castanea mollissima Blume (Chinese chestnut), Quercus acutissima Carruth. (sawtooth oak), Q. alba L. (white oak), Q. falcata Michx. (red oak), Q. nigra L. (water oak), Q. phellos L. (willow oak), Q. prinus L. (chestnut oak), Q. robur L. (English oak), and Q. virginiana Mill. (southern live oak).  Carya illinoinensis (Wang.) Koch (pecan) was also found naturally infected.  Lesions were produced on immature leaves of Cassia alata L. (candlestick shrub) and Platanus occidentalis L. (sycamore) inoculated with spores of an isolate of T. dryina from Q. nigra.  Q. acutissima, Q. robur, Castanea mollissima, and Carya illinoinensis are new host records.

References: Ridings, W. H. Fla. Dep. Agric. Cons. Plant Pathol. Circ. 130, 1973.  Sutton, B. C. Trans. Br. Mycol. Soc. 60:164, 1973.