The effects of rat damage on deepwater rice yields in Bangladesh

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Abstract
The effects of rat damage on deepwater rice (DWR) yields were evaluated in 1987 and 1988 by the use of exclusion fences in the Bangladesh Rice Research Institute's DWR site at Rajbari, Gazipur. Bandicota indica (Bechstein) and B. bengalensis (Gray and Hardwicke) started cutting the elongating stems from August and continued until harvest (November). Damage to stems and panicles was much higher in 1987 than 1988. Damage at the elongation stage (47%) was higher than at the ripening stage (34%). Estimated yield losses were 68% in 1987 and 32% in 1988 (average 47%). Management of rats is essential in such highly infested DWR areas. A simple and inexpensive rat control method needs to be developed for the subsistence DWR fanners of Bangladesh.