Question

A common biocontrol agent for plant diseases is

• A. $Bacillusthuringiensis$
  
  
• B. Baculovirus
  
• C. $Glomus$
• D. $Trichoderma$

Answer 1

The correct option is D $Trichoderma$

$Bacillusthuringiensis$
Butterfly caterpillars are usually controlled by the use of an endotoxin produced by organism Bacillus thuringiensis.

$Glomus$
Fungi usually from the genus Glomus form a symbiotic association with the plant roots. These fungi take phosphorus from the soil and pass it to the plant, enhancing plant growth and development.

$Trichoderma$
Trichoderma is a genus that includes certain free-living fungal species which act against soil-borne plant pathogens (for example, pathogenic fungi or nematode eggs), thus conferring disease resistance to the plants.

Certain fungi belonging to this species forms symbiotic association with the plant roots suppressing the growth of other fungus. It can be appropriately considered as a microbe used in biocontrol of pests and pathogens.

Baculovirus
Baculovirus are species-specific viruses that are used for the biological control of insects and other arthropods.
Final answer
(C) $Trichoderma$