economics Practical Magic

You only need to put rat traps on 4% of a farm to protect the entire field from getting trashed.

March 13, 2026

Original Paper

Nursery-centred plastic barrier trap systems suppress lesser bandicoot rat, Bandicota bengalensis  in canal-irrigated rice

Srinivasa Rao Namala, Vipin Choudhary, Anand Kumar ADVSLP, Sitarama Sarma A, Phani Kumar K, Nunavathu Nagendra Babu, Krishnaji Krishnaji, Srinivas T

SSRN · 6408210

The Takeaway

This challenges the assumption that pest control must be applied across an entire property to be effective. By focusing traps intensely on the "nursery" area where rats congregate during field flooding, farmers can achieve a massive 60% reduction in total damage with a tiny fraction of the usual effort and cost.

From the abstract

Rodent damage remains a major constraint in irrigated rice ecosystems of South Asia, where the lesser bandicoot rat (Bandicota bengalensis) is a dominant pest species. Conventional trap barrier systems (TBS) are difficult to implement in canal-irrigated rice because fixed irrigation schedules restrict the establishment of early trap crops required for attraction-based trapping. This study evaluated a nursery-centred plastic barrier trap system (PBTS) designed to intercept rodents displaced durin