Question:
Which insect among the following is NOT resistant to DDT?
Which insect among the following is NOT resistant to DDT?
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The kala-azar vector controlled by DDT indoor spraying is still susceptible to it.
Updated On: Jun 24, 2026
- Musca domestica (housefly)
- Phlebotomus (sandfly)
- Culex fatigans (mosquito)
- Anopheles stephensi (mosquito)
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: DDT has been used widely for vector control, and prolonged use has led to development of resistance in several arthropod vectors.
Step 2: Musca domestica (houseflies) developed DDT resistance early and extensively. Culex fatigans and Anopheles stephensi mosquitoes have also become widely resistant to DDT in many regions.
Step 3: Phlebotomus (sandfly), the vector of kala-azar, has remained largely susceptible to DDT, which is why indoor residual spraying with DDT was a mainstay of the kala-azar elimination programme.
Step 4: Therefore the insect that is NOT resistant to DDT among these options is Phlebotomus.
Conclusion: Phlebotomus is the answer. The printed answer key (B. Phlebotomus) is correct.
Step 2: Musca domestica (houseflies) developed DDT resistance early and extensively. Culex fatigans and Anopheles stephensi mosquitoes have also become widely resistant to DDT in many regions.
Step 3: Phlebotomus (sandfly), the vector of kala-azar, has remained largely susceptible to DDT, which is why indoor residual spraying with DDT was a mainstay of the kala-azar elimination programme.
Step 4: Therefore the insect that is NOT resistant to DDT among these options is Phlebotomus.
Conclusion: Phlebotomus is the answer. The printed answer key (B. Phlebotomus) is correct.
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