Introducing of plant disease principles agriculture

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III. Pre-Test

Select the best answer that corresponds to your choice.

1. This tries to prevent the entry of the pathogen in coming into the area

where it is currently unknown.

a. Eradication b. Protection c. Exclusion

2. This is intended to eliminate the pathogens that are already established in

the area.

a. Eradication b. Protection c. Exclusion

3. The prevention of infection by putting a chemical barrier between the

pathogen and the suscept.

a. Eradication b. Protection c. Exclusion

4. Modifying certain physiological and morphological features of the host in

not to be easily infected.

a. eradication b. immunization c. exclusion

5. The ability of the plant to overcome the effects of the pathogen.

a. tolerance b. resistance c. escape

6. The ability of the suscept to undergo severe infection without a serious

reduction of yield.

a. tolerance b. resistance c. escape

7. A susceptible plant does not become infected due to some circumstances.

a. tolerance b)resistance c)escape

8. The use predators and parasite to control disease.

a. chemical control b. biological c. physical

9. Protection of plant by mild virus strain against infection.

a. Bacteriophage b. cross protection c. interference

10.The use of pesticides is a —control.Scabe

C.O. : Venturia inaequalis

(anamorph: Spilocaea pomi)

Class : Dothidemycetes

Order : Pleosporales

Family : Venturiaceae

Economic importance:

• First reported from Sweden (1819)

• In India, the disease was first reported in the Kashmir valley

in 1935 by P. Nath on an indigenous apple cultivar ‘Ambri’.

• During 1977, scab was also detected in HP in an orchard

and in a few localized pockets of Kullu, Mandi and Chamba


• Its primary effect is reduction of the quality of infected fruit.

a . chemical b. biological c. physical