The bacterium $Bacillus$ $thuringiensis$ is widely used as which of the following?

Which of the following statements regarding baculoviruses as biocontrol agents is/are correct?
$I.$ Baculoviruses are pathogens that attack insects and other arthropods.
$II.$ Most of these biocontrol agents belong to the genus $Nucleopolyhedrovirus$.
$III.$ They do not harm plants,mammals,birds,fish,and other non-target insects.
$IV.$ Baculoviruses are helpful in Integrated Pest Management $(IPM)$ programmes,in which beneficial insects are conserved.
Choose the correct option.

Sporeine was developed in

What has led to a reduction in the use of chemical pesticides?

Bionematicides are used for the control of which pests?

Which fish controls diseases like malaria and filariasis by feeding on mosquito larvae?