for sem 7 as per GTU syllabus

1. P R E P A R E D B Y
M R S . P O O J A K H A N P A R A
A S S I S T A N T P R O F E S S O R
A P I P , J A M N A G A R
NATURAL
PESTICIDES

6. Mechanism of action of pesticides
 Broad categories – As
 1. Stomach poisons:
 Kill by being taken into stomach, absorbed in the
blood and leads to the death of the pest due to the
toxic action.
 2. Contact insecticides:
 Kill by direct or indirect contact with the insect or
sometimes it penetrates inside the body and causes
oxidation and suffocates the insect.

7.  3. Fumigants:
 Can be applied only in enclosed areas where it
surrounds the insect, enters their breathing pores
and kills.

10. Contact/Protectant Systemic
 Adsorbed
 Immobile
 Preventive
 Multi site of action
 Few problems with
Resistance
 Eg: Mancozeb, Maneb,
Sulfur, copper
 Absorbed
 Mobile
 Preventive + Curative
 Single site of action
 Resistant fungi strains could
develop
 Eg:-Metalxil,
Dimethomorph, Thiphenate
methyl.
Contact vs Systemic Fungicides

11. Types of fungicides