Q.3
Chlorpyriphos methyl is effective against stored product insects except
- Rhizopertha dominica (lesser grain borer): Possesses documented widespread physiological tolerance and cross-resistance against organophosphate grain protectants like chlorpyrifos-methyl, requiring synthetic pyrethroids or fumigation. (Correct answer)
- Tribolium castaneum (red flour beetle): Highly susceptible to surface and grain treatment using chlorpyrifos-methyl at standard recommended doses.
- Caryedon serratus (groundnut bruchid): A major storage pest of groundnut pods, effectively controlled by chlorpyrifos-methyl.
- Oryzaephilus surinamensis (sawtoothed grain beetle): A secondary stored grain pest that is effectively controlled by organophosphate protectants.
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