Which one of the following insect pests causes damage to groundnut in storage:

Correct option is B

Let's analyze the options:
· (a) Rhyzopertha dominica – Lesser grain borer; mainly infests stored cereals like wheat and rice, not groundnut.
· (b) Caryedon serratus – Groundnut bruchid; this is the primary pest of stored groundnut pods. It lays eggs on the pods, and the larvae bore into kernels, causing serious damage.
· (c) Tribolium castaneum – Red flour beetle; common in stored flour and milled products, not a primary pest of groundnut.
· (d) Sitotroga cerealella – Angoumois grain moth; mostly affects stored cereals like maize and rice.
�� Correct answer is (b) Caryedon serratus, the specific pest known for infesting and damaging groundnuts in storage.