Baculoviruses (Nucleopolyhedrovirus) do not show:

The correct answer is Option (4) → effects on non-target insects

Baculoviruses are viruses that attack insects and other arthropods. Most of those used in biological control belong to the genus Nucleopolyhedrovirus. They are species-specific: each kills only a narrow group of pest insects and leaves other organisms alone.

Option (1) narrow spectrum applications — Shown by baculoviruses. Baculoviruses are excellent for narrow spectrum insecticidal use, so they do show this feature.

Option (2) host specificity — Shown by baculoviruses. Being species-specific means they attack only their own host insects. They show host specificity.

Option (3) utility in IPM programme — Shown by baculoviruses. Because they spare useful insects, they are desirable in IPM (integrated pest management) programmes, so they do show this utility.

Option (4) effects on non-target insects — Not shown by baculoviruses. Baculoviruses have no negative impact on non-target insects, nor on plants, mammals, birds or fish. This is the feature they do not show.

NCERT Extract:
Microbes as Biocontrol Agents – “… Baculoviruses are pathogens that attack insects and other arthropods. The majority of baculoviruses used as biological control agents are in the genus Nucleopolyhedrovirus. These viruses are excellent candidates for species-specific, narrow spectrum insecticidal applications. They have been shown to have no negative impacts on plants, mammals, birds, fish or even on non-target insects. This is especially desirable when beneficial insects are being conserved to aid in an overall integrated pest management (IPM) programme, or when an ecologically sensitive area is being treated.”