Fungicides in Plant
Disease Control
,Definitions / Terminologies
Fungicide / Fungitoxicant : It is an agent which has the
ability to kill the fungi
Fungistat : Some chemicals do not kill the fungal pathogens,
but has the ability to arrest the growth of the fungus
temporarily. Eg. Sodium benzoate, Potassium sorbate
Fungistasis :The phenomenon of temporarily inhibition of
the growth of the fungus
Antisporulent : Some chemicals may inhibit the sporulation
without affecting the vegetative growth of the fungus. Eg.
Tetrachlorophenol
,Characteristics of an ideal fungicide
✓ Low phytotoxicity
✓ Broad spectrum of activity
✓ Compatible with other agrochemicals
✓ It should not be toxic to humans, animals, earth worms
& beneficial microbes
✓ Stability in storage
✓ Stability after dilution to spray strength
✓ Availability in different formulations
✓ Easily available in market with cheap price
✓ Ease transport
, Classification of fungicides
1. Mode of action
Protectant: Fungicide which protect a plant from a pathogen if it is
applied prior to infection. They are prophylactic in nature.
Zineb & Sulphur
Therapeutant: Fungicide which eradicates a fungus after it has
caused infection by curing the plant. Mostly they are systemic in
nature.
Carboxin & Oxycorboxin
Eradicant: A chemical that destroys a pathogen after its
establishments in the host. It also act as protectant.
Organic mercurials, Lime Sulphur & Dodine
Disease Control
,Definitions / Terminologies
Fungicide / Fungitoxicant : It is an agent which has the
ability to kill the fungi
Fungistat : Some chemicals do not kill the fungal pathogens,
but has the ability to arrest the growth of the fungus
temporarily. Eg. Sodium benzoate, Potassium sorbate
Fungistasis :The phenomenon of temporarily inhibition of
the growth of the fungus
Antisporulent : Some chemicals may inhibit the sporulation
without affecting the vegetative growth of the fungus. Eg.
Tetrachlorophenol
,Characteristics of an ideal fungicide
✓ Low phytotoxicity
✓ Broad spectrum of activity
✓ Compatible with other agrochemicals
✓ It should not be toxic to humans, animals, earth worms
& beneficial microbes
✓ Stability in storage
✓ Stability after dilution to spray strength
✓ Availability in different formulations
✓ Easily available in market with cheap price
✓ Ease transport
, Classification of fungicides
1. Mode of action
Protectant: Fungicide which protect a plant from a pathogen if it is
applied prior to infection. They are prophylactic in nature.
Zineb & Sulphur
Therapeutant: Fungicide which eradicates a fungus after it has
caused infection by curing the plant. Mostly they are systemic in
nature.
Carboxin & Oxycorboxin
Eradicant: A chemical that destroys a pathogen after its
establishments in the host. It also act as protectant.
Organic mercurials, Lime Sulphur & Dodine
