Classification of fungicide

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🔰0Classification of Fungicide

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🔘Fungicides can be broadly grouped based on their 

(i) mode of action

(ii) general use 

(iii) chemical composition.

1》 Based on mode of action

■Protectant🛡

As the name suggests, protectant fungicides are prophylactic in their behaviour. Fungicide which is effective only it applied prior to fungal infection is called a protectant, 

eg, Sulphur 

      zineb💊

■Therapeutunt🔬

Fungicide which is capable of eradicating a fungus after it has caused infection and there by curing the plant is called chemotherapeutunt

 eg. Carboxin. 

       Oxycarboxin 

       antibiotics like Aureofungin.

Usually chemotherapeutant are systemic in their action and affect the deep-seated infection💊

■Eradicant⚔

Eradicant are those which remove pathogenic fungi from an infection court (area of the host around a propagating unit of a fungus in which infection could possibly occur),

 eg. Organic mercurials,

       lime

       sulphur, dodine etc.💊

These chemicals eradicate the dormant or active pathogen from the host. 

They can remain effective on or in the host for some time. 

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2 》 Based on general uses

The fungicides can also be classified hased on the nature of their use in nunaging the diseases.

1. Seed protectants: 

Eg. Captan

      thiram 

      organomercuncs

      carbendazim 

      carboxin etc💊

2. Soil fungicides (preplant) : 

Eg. Bordeaux mixture, 

      copper oxy chloride. 

      Chloropicrin.

      Formaldehyde 

       Vapam etc.💊

3. Soil fungicides: 

Eg. Bordeaux mixture, 

      Capton.

      PCNB, 

      thiram etc💊

4. Foliage and blossom: 

Eg. Captan , 

      zineb protectants 

      mancozeb, 

      chlorothalonil etc💊

5. Fruit protectants: 

Eg. Captan 

      maneb 

      carbendaim 

      mancozeb etc💊

6. Eradicunts: 

Eg. Organomercurials

      lime 

      sulphur, etc💊

7. Tree wound dressers: 

Eg. Boreaux paste, 

      chaubattia paste, etc💊

8. Antibiotics: 

Eg. Actidione, 

      Griseofulvin, 

      Streptomycin, 

      Streptocycline, etc💊

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3》 Based on Chemical Composition

The chemical available for plant disease control runs into hundreds, however, all are not equally safe, effective and popular. 

Major group of fungicides used include

salts of toxic metals

organic acids

organic compounds of sulphur mercury,

quinines and heterocyclic nitrogenous compounds. 

Copper

mercury

zinc and nickel 

are some of the metals used as base for inorganic and organic fungicides. 

The non metal substances include, sulphur, chlorine, phosphorous