Chemical Seed Treatments for the Control of Cotton Seedling Pathogens
Mar 21, 2019
Seedling diseases of cotton are a very serious problem in Greece because planting starts early in the spring when cold soil and weather conditions favour the development of the disease. The major soil dorne pathogens involved are Pythium ultimatum, Rhizoctonia solani and Thielaviopsis basicola. Cotton seed treatments are designed to protect seed and seedlings from the pathogen complex that cause the seeds, roots and hypocotiyl to rot. Following many years of testing, Vitavex was found to be the most effective against R. solani while two different commercial formulations of metalaxyl (Apron and Ridomil) were found to be effective against P. ultimatum. Black root rot of cotton was significantly reduced when cotton seed was treated with any one of the fungicides Benlate, Bayfidan or Bayleton. Combinations of metalaxyl, benlate and carboxin were found to be effective against damping off caused by all three pathogens. Evaluation of cotton seed treatments in 1994 showed that metalaxyl plus carboxin was the combination that gave the highest final cotton seedling survival. However, the specific pathogen controlled in this trial was R. solani.