ABSTRACT
The fungicides can be classified based on the nature of their use in managing the diseases. Using fungicides on seed is one of the most efficient and economical methods of chemical disease control. The seed dressing chemicals may be applied by dry treatment, wet treatment and slurry. To kill the seed-borne fungi and bacteria. The seeds are treated with concentrated sulphuric acid at 100 ml/kg of seed for 2–3 minutes. Volatile toxicants (fumigants) such as methyl bromide, chloropicrin, formaldehyde and vapam are the best chemical sterilants for soil to kill fungi and nematodes as they penetrate the soil efficiently. Spraying of fungicides is done on leaves, stems and fruits. Wettable powders are most commonly used for preparing spray solutions. The most common diluent or carrier is water. The dispersion of the spray is usually achieved by its passage under pressure through nozzle of the sprayer.
