Comparison of Biological and Chemical Treatments for Control of Bacterial Speck of Tomato Under Field Conditions in Morocco. J. E. Colin, Institut Agronomique et Veterinaire Hassan II, Complexe Horticole d’Agadir, B.P. 438, Agadir, Morocco. Z. Chafik, Institut Agronomique et Veterinaire Hassan II, Complexe Horticole d’Agadir, B.P. 438, Agadir, Morocco. Plant Dis. 70:1048-1050. Accepted for publication 22 March 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-1048.

Bacterial speck of tomato caused by Pseudomonas syringae pv. tomato was partially controlled by biological and chemical treatments. The effects of P. syringae pv. tomato infection and of control treatments were significant on percentage of reject fruit (total and specked) but not on total fruit yield and flower drop. Weekly applications of two antagonistic pseudomonads gave a level of protection equal to that of copper compounds and had a slightly greater residual effect.