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A common biocontrol agent for the control of plant diseases is
A
$Trichoderma$
B
Baculovirus
C
$Bacillus\ thuringiensis$
D
$Glomus$
Detailed Solution
$Trichoderma$ species are free-living fungi that are very common in root ecosystems; they are effective biocontrol agents of several plant pathogens (i.e., of plant diseases).
Baculoviruses (genus $Nucleopolyhedrovirus$) are pathogens that attack insects and other arthropods; they control insect pests, not plant diseases.
$Bacillus\ thuringiensis$ is used to control butterfly caterpillars (insect pests).
$Glomus$ is a mycorrhizal fungus used as a biofertiliser.
Hence the common biocontrol agent for plant diseases is $Trichoderma$.
Baculoviruses (genus $Nucleopolyhedrovirus$) are pathogens that attack insects and other arthropods; they control insect pests, not plant diseases.
$Bacillus\ thuringiensis$ is used to control butterfly caterpillars (insect pests).
$Glomus$ is a mycorrhizal fungus used as a biofertiliser.
Hence the common biocontrol agent for plant diseases is $Trichoderma$.