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• In Local traps called ' butta' are extensively used for the control of rodents in rice. These traps provide fairly good results when applied after chemical control operation.
• However when directly used, trapping will be costly affair and one can not manage entire population over large areas.
• Moreover, at certain crop stages, like primordial formation, rodents are not attracted towards traps.
Natural Smoke : The main principle involved in this operation is simply filling the burrows with smoke, which causes suffocation to rodents ultimately leading to their death. The smoke liberated by burning rice straw mainly contains carbondioxide.
Chemical Control Fumigation
• The fumigants like Aluminum phosphide is effective and widely used for the control of field rodents living in burrows.
• The control of rodents using rodenticides is the more common way
1. Acute rodenticides (Single dose and quick acting), Eg : Zinc phosphide.
2. Chronic rodenticides (Multi dose and slow acting), Eg : Warfarin, Bromodiolone. Acute Rodenticides:
Among the acute rodenticides, Zinc phosphide and Barium carbonate are registered for use. Zinc phosphide is the onlys
Advantages of Zinc Phosphide
1. Quick killing
2. Small quantity of chemical is required
3. Single feeding
4. Population can be brought down immediately.
Disadvantages of Zinc Phosphide
1. Necessity of prebaiting,
2. Low killing around 40 - 50 %,
3. Induce bait shyness.
4. Toxic to non target species,
5. Chances of secondary poisoning are more.