Author : Begonia, Gregorio B.

Summary : Treatments with napropamide (2.0 kg/ha), butralin (1.5 kg/ha) and napropamide plus butralin (1 + 1 kg/ha) combination on direct-seeded tomatoes that have been inocultaed with sclerotium rolfsii sacc. gave a significant reduction in the incidence of damping-off compared to the untreated but inoculated check. Among the herbicide treatments used, butralin showed the greatest reduction in the percentage of diseased plants. Predisposing the tomato plants to the herbicides for 7 and 14 days before transplanting them to herbicide - free inoculated soil, did not alter their response to S. rolfsii. Although there was a manifestation of herbicide injury, the magnitude of such injury was not sufficient to modify the susceptibility of tomato plants to the pathogen.