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FUNGICIDES AND THEIR APPLICATION
Exercise 15: FUNGICIDES AND THEIR APPLICATION |
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The chemicals applied to control plant diseases are broadly called fungicides. These chemicals either inhibit growth, sporulation or are lethal to causal organism. According to their mode of action, they may be protectants (effective if applied before infection) or chemotherapeutants (effective if applied after infection). On the basis of mobility, chemotherapeautants are either eradicants (absorbed but not translated) or systemic (translocated in plant system to the site of action). Fungicides are formulated as dust, wettable powder, liquid or emulsion (Table 1). Some common fungicides are given below:
Table 1: List of diffetrent fungicides used to control plant diseases 1. Seed treatment fungicides
2. Soil treatment chemicals/ fungicides
3. Foliar spray fungicides
Application of Fungicides Fungicides are applied on host surface with the help of various devices. For example, seed treating drums are used for seed treatment, sprayers for carrying out spray on foliar parts, and dusters for dusting fungicides on aerial parts of plants. The sprayers are of various types. These may be manually or power operated. The quality of spray can be maintained with the help of nozzles and other automizing devices. Knapsac sprayer is commonly used for applying fungicides on crop plants (Fig. 1). Fig. 1: Knapsac sprayer |