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Chronic Rodenticides

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• In order to overcome limitations and hazardous nature of acute rodenticides, lengthy baiting programme and possibility of resistance, new series of rodenticides have been developed and known as single dose anti-coagulants or second generation anti-coagulants.

These rodenticides (Bromodiolone) combines better qualities of acute and chronic rodenticides.

• For effective and successful rodent control, the following programme should be adopted on large areas at a time on community approach.

• Chronic or multi-dose rodenticides (at present only anti-coagulants) are much safer than acute rodenticides because they are less toxic to the non-target species. But they have to be fed for 5 - 7 days to obtain desired results, which increases the cost of operation

Day-1: Identify live burrows and place 15 g bromodiolone concentrate bait inside the burrow.

Day-2: Repeat Bromodiolone baiting in active or live burrows.

Day-3: Eliminate residual population through trapping or fumigation with burrow fumigator Principles

• Grow same maturity group cultivars on large areas to restrict the availability of the vulnerable stage (Reproductive) of the crop.

• Reduce the number and size of the bunds, keep them clean to locate burrows and avoid harborage.

• Rodent control operations should be taken up on large area at a time.

• It checks cross infestation or migration of rodents from untreated fields to treated fields.

• All the control operations should be completed before the crop attains primordial initiation stage since at this stage the rodents are invariably attracted to the rice crop.

• Rodenticides should be made available before beginning of the season.

File Courtesy: 
RARS, Karjat
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