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NCERT Exemplar · Q24

Q.What for Nucleopolyhydro viruses are being used now a days?

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Nucleopolyhedroviruses are currently used as biological control agents against insect pests, particularly in Integrated Pest Management (IPM) programs, due to their species-specific action and environmental safety.

Nucleopolyhedroviruses (NPVs) belong to a group of viruses known as Baculoviruses. These viruses are naturally occurring pathogens that primarily infect insects and other arthropods. In recent times, their unique biological characteristics have made them invaluable tools in the field of pest management, offering an environmentally conscious alternative to traditional chemical pesticides.

The primary application of Nucleopolyhedroviruses nowadays is as biological control agents. This means they are employed to naturally regulate populations of insect pests that damage crops, forests, and other ecosystems. Their use falls under the broader strategy of Integrated Pest Management (IPM), which seeks to control pests using a combination of methods, minimizing economic, health, and environmental risks.

The reasons for their increasing adoption are rooted in several key advantages:

  • Species-Specific Action: NPVs are highly specific in their infectivity. They typically target only a very narrow range of insect species, often just one or a few closely related species. This is a crucial distinction from broad-spectrum chemical pesticides, which can harm a wide variety of organisms.
  • No Negative Impact on Non-Target Organisms: A significant benefit of NPVs is their demonstrated safety profile. Research has shown that these viruses have no adverse effects on plants, mammals, birds, fish, or even beneficial insects like bees (pollinators) and predatory insects (which themselves help control pests).
  • Environmental Friendliness: Because of their specificity and safety, NPVs do not contribute to environmental pollution in the way chemical pesticides do. They do not leave harmful residues in soil or water, nor do they accumulate in the food chain. This makes them ideal for use in ecologically sensitive areas or organic farming practices.
  • Role in Integrated Pest Management (IPM): Their selective nature makes them excellent candidates for IPM programs. By using NPVs, farmers and forest managers can control specific pests without disrupting the natural balance of beneficial insects and other organisms that contribute to a healthy ecosystem. This helps in maintaining biodiversity and reducing reliance on synthetic chemicals. …

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