Measuring crop damage and yield loss is labor
intensive and complicated by the ability of rice to
compensate for rodent damage up to tillering (Buckle
and Rowe, 1981; Islam and Hossain, 2003). Damage is
measured usually only once after tillering, often in the
2 weeks prior to harvest (Buckle et al., 1985; Fieldler,
1986). When rice is mature and nutritious, to obtain
sufficient food rats need to cut only 1–2 tillers instead
of numerous tillers at booting. That only 16% of the
cumulative damage was recorded just prior to harvest
suggests that a 6.5 times multiplier of damage in the
week prior to harvest would provide a simple index for
estimating rat damage during the reproductive stage of
lowland irrigated rice.
Measuring crop damage and yield loss is laborintensive and complicated by the ability of rice tocompensate for rodent damage up to tillering (Buckleand Rowe, 1981; Islam and Hossain, 2003). Damage ismeasured usually only once after tillering, often in the2 weeks prior to harvest (Buckle et al., 1985; Fieldler,1986). When rice is mature and nutritious, to obtainsufficient food rats need to cut only 1–2 tillers insteadof numerous tillers at booting. That only 16% of thecumulative damage was recorded just prior to harvestsuggests that a 6.5 times multiplier of damage in theweek prior to harvest would provide a simple index forestimating rat damage during the reproductive stage oflowland irrigated rice.
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