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Home/ Questions/Q 1050
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N.K. Sharma
N.K. Sharma
Asked: January 8, 20242024-01-08T03:33:56+05:30 2024-01-08T03:33:56+05:30

Differentiate between Monophagous and Polyphagous Pests.

Distinguish between pests that are polyphagous and monophagous.

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    1. Abstract Classes Power Elite Author
      2024-01-08T03:34:25+05:30Added an answer on January 8, 2024 at 3:34 am

      Monophagous and polyphagous pests are terms used to describe the feeding habits of pest species, particularly in the context of agriculture and horticulture. These terms are crucial in understanding the behavior of pests and in developing strategies for their management.

      Monophagous Pests

      Definition: Monophagous pests are those that feed on a single species or a very limited range of closely related host plants.

      Characteristics:

      1. Specialized Diet: Their diet is restricted to one type of plant species or a few species within the same genus.
      2. Host-Specific Behavior: Due to their specialized feeding habits, monophagous pests are often highly adapted to their host plant. This includes adaptations in their lifecycle, feeding mechanisms, and even in overcoming the plant's defense mechanisms.
      3. Impact on Specific Crops: Monophagous pests can be particularly devastating to specific crops. If a crop matches their narrow host range, these pests can cause significant damage.
      4. Management: Managing monophagous pests can be somewhat straightforward if their host plant is known. Control strategies can be targeted specifically at the pest-host plant interaction.

      Examples: The Colorado potato beetle (Leptinotarsa decemlineata), which primarily feeds on potatoes, is an example of a monophagous pest.

      Polyphagous Pests

      Definition: Polyphagous pests are those that feed on a wide variety of host plants, often across several plant families.

      Characteristics:

      1. Broad Diet: They are capable of feeding on many different plant species, often including a wide range of agricultural crops, ornamental plants, and wild flora.
      2. Adaptability: Polyphagous pests are generally more adaptable to different environmental conditions and changes in plant availability. This adaptability makes them more resilient to various control measures.
      3. Widespread Impact: Due to their ability to feed on multiple plant species, polyphagous pests can affect a wide range of crops and are capable of causing extensive agricultural damage across diverse ecosystems.
      4. Management Challenges: Controlling polyphagous pests can be challenging due to their wide host range and adaptability. Integrated Pest Management (IPM) strategies often need to be more comprehensive and dynamic.

      Examples: The fall armyworm (Spodoptera frugiperda), known for its ability to feed on a variety of crops including maize, rice, and sorghum, is a polyphagous pest.

      Conclusion

      Understanding whether a pest is monophagous or polyphagous is crucial for effective pest management. Monophagous pests, with their specialized feeding habits, can be devastating to specific crops but may be easier to manage due to their limited host range. In contrast, polyphagous pests pose a challenge due to their ability to feed on a wide variety of plants, requiring more complex and versatile management strategies.

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